Faculty Profiles - EGUSA Nobuyuki

Published Papers - EGUSA Nobuyuki

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活断層型地震を対象にした災害廃棄物の発生量・組成・空間分布の早期予測システム

丸山結貴弥, 田内裕人, 江種伸之（Part： Last author )

土木学会論文集 81 ( 22 ) 24-22004 2025.03 [Refereed]

DOI

A Transfer Learning Approach Based on Radar Rainfall for River Water-Level Prediction

Futo Ueda, Hiroto Tanouchi, Nobuyuki Egusa, Takuya Yoshihiro

Water 16 ( 4 ) 607 2024.02 [Refereed]

DOI

原位置不溶化処理地盤における汚染物質の挙動評価

日野良太, 三浦俊彦, 福武健一, 西田憲司, 森下智貴, 日笠山徹巳, 江種伸之（Part： Last author )

地盤工学会誌 71 ( 9 ) 35 - 40 2023.09 [Refereed]

移流分散方程式で用いられる遅延係数について

江種伸之（Part： Lead author,　Corresponding author )

地下水学会誌 64 ( 3 ) 215 - 223 2022.08 [Refereed]

A Numerical Simularion of Disaster Waste Disposal in Wakayama City by Using DHT Model

Soichiro Asai, Tatsuya Akiyama, Hiroto Ttanouchi, Nobuyuki Egusa （Part： Last author )

International Journal of GEOMATE ( International Journal of Geomate ) 20 ( 80 ) 23 - 28 2021.04 [Refereed]

DOI

A Retardation Factor Considering Solute Transfer Between Mobile and Immobile Water in Porous Media

Nobuyuki Egusa, Kei Nakagawa, Tatemasa Hirata （Part： Lead author,　Corresponding author )

Environmental Modeling & Assessment ( Springer Science and Business Media LLC ) 26 ( 1 ) 103 - 112 2021.02 [Refereed]

DOI

水銀およびふっ素によって汚染された地盤の原位置不溶化処理に伴う長期安定性に関する評価

日野良太, 三浦俊彦, 福武健一, 西田憲司, 森下智貴, 日笠山徹巳, 江種伸之（Part： Last author )

地盤工学ジャーナル 15 ( 3 ) 563 - 571 2020.09 [Refereed]

Quantitative Evaluation of Water Pollutant Load from Kinokawa River Basin by High-Frequency Water Quality Observation

Hiroto Tanouchi, Akihisa Imoto, Kouichi Ishiura, Nobuyuki Egusa （Part： Last author )

International Journal of GEOMATE ( GEOMATE INT SOC ) 18 ( 66 ) 105 - 110 2020.02 [Refereed]

In the Kinokawa river basin, as same as other watersheds around the world, excess runoff of nutrients to the ocean mainly due to human activities has become an environmental issue. This study conducted high-frequency total nitrogen (TN) and total phosphorus (TP) monitoring at several monitoring posts set downstream of the Kinokawa river in the Kii peninsula, Japan in order to evaluate water pollutant load from the basin quantitatively. The water sampling has been conducted about 90 times for over a year from May in 2018 at the monitoring posts. In the calm or the drought periods, TN and TP concentrations at Kinokawa river mouth were basically about 0.8 similar to 1.1 mg/L and under 0.05 mg/L, respectively. However, TN concentrations was exceeded 5.0 mg/L after one of the most intense storms, it was shown the TN concentration had a tendency extremely to rise rapidly in flooding condition. This tendency was similar in TP. The result of pollutant load analysis showed that 65% of the nitrogen load and 80 % of the phosphorus load from the basin was generated during a few and heavy flooding which were included in 5 % flow exceedance probability. These results imply it is essential that to understand and to predict how nutrients runoff in short-term during flooding events in order to accurately grasp long-term nutrient runoff amount.

DOI

テトラクロロエチレン及びその分解性生物の分解速度定数が到達距離に与える影響の基礎的検討

保高徹生, 江種伸之（Part： Last author )

第13回環境地盤工学シンポジウム発表論文集 143 - 147 2019.09 [Refereed]

原位置不溶化処理に伴う地盤内汚染物質の長期安定性に関する定量的評価

日野良太, 三浦俊彦, 福武健一, 森下智喜, 西田憲司, 日笠山徹巳, 江種伸之（Part： Last author )

第13回環境地盤工学シンポジウム発表論文集 253 - 258 2019.09 [Refereed]

DEVELOPMENT OF A DISASTER WASTE DISPOSAL PLANNING MODEL AIMING AT SUPPORTING OF APPROPRIATE DECISION OF DISASTER WASTE TREATMENT

SAKAGUCHI Naoya, TANOUCHI Hiroto, EGUSA Nobuyuki, OTSUKA Yoshikazu

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) ( Japan Society of Civil Engineers ) 74 ( 5 ) I_195 - I_202 2018.09 [Refereed]

 In order to support planning of disaster waste disposal, a numerical model simulating disaster waste transportation and disposal was developed. The proposed model tracks the movement of disaster waste between originating region, temporary storage areas and final disposal site. A crushing/classification process at temporary storage areas, Number of vehicle as a carrier, transit route, a capacity of temporary storage areas and final disposal site are freely settable in the model. The model was applied for a city in Mie prefecture aiming at evaluating of actual disaster waste disposal plan at the time of the occurrence of Nankai Trough earthquake. The result of simulation indicated that a number of crushing/classification equipment and workers were required in order to execute disaster waste disposal.

DOI

1953年の7.18水害を対象とした斜面崩壊の素因分析

田内裕人, 藤田三四郎, 江種伸之（Part： Last author,　Corresponding author )

第9回土砂災害に関するシンポジウム論文集 13 - 18 2018.09 [Refereed]

APPLICATION OF THE HYPE MODEL FOR KINOKAWA RIVER BASIN AIMING AT WATER AND NUTRIENT RUNOFF ANALYSIS

TANOUCHI Hiroto, NAKAMURA Makoto, NAKAMURA Yuki, EGUSA Nobuyuki （Part： Last author )

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) ( Japan Society of Civil Engineers ) 74 ( 5 ) I_223 - I_232 2018.09 [Refereed]

 HYPE(hydrological predictions for the environment) model was applied for Kinokawa river basin in order to evaluate an applicability of HYPE for Japanese watershed. Firstly, a fundamental HYPE in Kinokawa was constructed by using landuse, soil, topology information based on Swedish HYPE. Secondly, a calibration based on Markov Chain Monte Carlo method was performed in order to improve prediction accuracy of Kinokawa river flow rate. Then, point and non-point sources of nitrogen and phosphorus were implemented aming at runoff analysis. According to the comparison of simulated and observed nutrient load, it was shown that the accuracy of nutrient load predicted by HYPE was reasonable. In conclusion, it was suggested that HYPE was available for Japanese watershed aiming at water and nutrient runoff analysis.

DOI

An Integrated Support System for Disaster Prevention Map-Making Using Town-Walk Information Gathering.

Sojo Enokida, Takashi Yoshino, Taku Fukushima, Kenji Sugimoto, Nobuyuki Egusa （Part： Last author )

Proceedings of 10th International Conference CollabTech 2018 19 - 34 2018.09 [Refereed]

DOI

Proposal of an Integrated Support System for Disaster-preparedness Map Making Through Town-walk Type of Gathering Information

榎田宗丈, 福島拓, 吉野孝, 杉本賢二, 江種伸之（Part： Last author )

情報処理学会論文誌 59 ( 3 ) 992 - 1004 2018.03 [Refereed]

Throughout Japan, disaster-preparedness maps have been made by the method of town-walk. This method improves disaster-preparedness and allows for a greater understanding of the area. The making of disaster-preparedness maps increases the disaster awareness of the participants. Further, the involvement improves participants' ability of self-help and increases cooperation in local communities. Currently, there is a system to support the making of conventional disaster-preparedness maps, but no support system for maps made using the town-walk method. Therefore, we have proposed and developed an integrated support system for the making of disaster-preparedness maps by gathering information from the town-walk. We conducted a comparison experiment between the proposed system and the conventional system (using paper maps). This experiment demonstrated that a consistent support function would be effective in developing disaster-preparedness maps using the town-walk method. We also confirmed that the proposed system influences the improvement of disaster-preparedness awareness, the understanding of the area, and the conventional system.

AN ANALYSIS OF LANDSLIDE DISASTER INCENTIVES OCCURRED IN TYPHOON NO.12 IN 2011 ON THE POINT OF VIEW FROM RAINFALL PATTERN AND SOIL WATER INDEX

田内裕人, 中村誠, 江種伸之, 平田健正（Part： Corresponding author )

土木学会論文集B1(水工学) ( 土木学会 ) 73 ( 4 ) I_243 - I_248 2018.03 [Refereed]

EFFECT OF IN-SITE BIOREMEDIATION IN AN AQUIFER CONTAMINATED BY A LARGE VARIETY OF VOLATILE ORGANIC COMPOUNDS

福永翔太, 田内裕人, 江種伸之, 平田健正, 川本克也（Part： Corresponding author )

土木学会論文集B1(水工学) ( 土木学会 ) 73 ( 4 ) I_61 - I_66 2018.03 [Refereed]

EVALUATION OF LANDSLIDE DISASTER BY PSEUDO GLOBAL WARMING EXPERIMENT RAINFALL AND SOIL WATER INDEX ON SHINGU RIVER BASIN, WAKAYAMA WITH TYPHOON T1204

西岡誠悟, 小林健一郎, 奥勇一郎, 江種伸之, 田内裕人

土木学会論文集B1(水工学) ( 土木学会 ) 73 ( 4 ) I_87 - I_92 2018.03 [Refereed]

平成23年台風12号に伴う那智大社裏山の崩壊・土石流の実態

矢野晴彦, 辻野裕之, 谷垣勝久, 石田優子, 後誠介, 田内裕人, 本塚智貴, 江種伸之（Part： Last author )

Kansai Geo-Symposium 2017論文集 250 - 253 2017.11 [Refereed]

Restraint Effects of 2-MIB Concentration Increases Due to Total Phosphorus Management in the Upper Kinokawa Watershed

R. Hino, N. Egusa, Y. Wada, M. Ishizuka, T. Hirata （Part： Corresponding author )

International Journal of GEOMATE ( GEOMATE INT SOC ) 13 ( 37 ) 141 - 148 2017.09 [Refereed]

The off-flavor taste of tap water due to 2-methylisoborneol (2-MIB) is caused by blue-green algae. This is one of the water quality problems associated with high nutrient loads, such as those found in the Kinokawa River, with drains the southwestern part of the Kii peninsula in Japan. Water quality monitoring data showed that 2-MIB tended to increase when total phosphorus (TP) concentration exceeded 0.02 mg/L. This study employed mass load and river water quality analyses coupled with water runoff analyses to examine ways of mitigating TP load in river water. In this study, it was revealed following things. (1) TP mass load could be reduced by approximately half if the industrial drainage volume standards defined in the Water Pollution Control Law were more stringent. (2) TP concentration could be decreased by 41% in response to TP mass load reduction and by 5% in response to an increase in river flow rate. (3) TP mass load reduction combined with an increase in river flow rate could reduce TP concentration to less than 0.015 mg/L and prevent increases in 2-MIB in tap water.

DOI

Availability of Disaster Preparedness Awareness Improvement for Supplying Knowledge Using Microblog and Comic Expression.

Sojo Enokida, Taku Fukushima, Takashi Yoshino, Tomoki Motozuka, Nobuyuki Egusa （Part： Last author )

Proceedings of 9th International Conference Collab Tech 2017 37 - 52 2017.08 [Refereed]

DOI

災害時支援システム“あかりマップ”の地域住民による防災マップ作成への適用

吉野孝, 濵村朱里, 福島拓, 江種伸之（Part： Last author )

情報処理学会論文誌 58 ( 1 ) 1 - 10 2017.01 [Refereed]

Assessment of Off-Flavor Tap Water due to Nutrient and River Flow Management Practices In the Upper Kinokawa River Watershed

R.Hino, N.Egusa, Y.Wada, M.Ishizuka, T.Hirata （Part： Corresponding author )

Second International Conference on Science, Engineering and Environment (SEE) 897 - 902 2016.12 [Refereed]

平成23年台風12号により和歌山県東牟婁地域で発生した土砂災害の地理的特徴

中村誠, 田内裕人, 江種伸之, 石田優子, 後誠介（Part： Corresponding author )

Kansai Geo-Symposium 2016論文集 37 - 42 2016.11 [Refereed]

実効雨量と土壌雨量指数から見た平成23年台風12号による土砂災害現場の水文地質特性

田内裕人, 江種伸之, 平田健正（Part： Corresponding author )

第8回土砂災害に関するシンポジウム論文集 19 - 24 2016.09 [Refereed]

日常利用可能なオフライン対応型災害時避難支援システム”あかりマップ”の実環境における利用可能性

濵村朱里, 福島拓, 吉野孝, 江種伸之（Part： Last author )

情報処理学会論文誌 57 ( 1 ) 319 - 330 2016.01 [Refereed]

Examined Plan of off-flavor of Tap Water by Nutrient Managements in the Upper of the Kinokawa River

HINO Ryota, WADA Yasuhiro, EGUSA Nobuyuki （Part： Last author,　Corresponding author )

Papers on Environmental Information Science ( Center for Environmental Information Science ) 29 183 - 188 2015.12 [Refereed]

The off-flavor taste of tap water due to 2-methylisoborneol (2-MIB) derived from blue algae is one of the water quality problems associated with high nutrient loads in the Kinokawa River. Existing monitoring data showed that 2-MIB concentrations tended to increase when total phosphorus (TP) concentrations exceeded 0.02 mg/L. This study employed mass load and river water quality analyses to examine ways in which TP loads in river runoff could be mitigated. The results suggested that TP mass loads could be reduced by approximately half if the drainage volume standards defined in the Water Pollution Control Law were more stringent. In addition, halving current mass loads could reduce TP concentrations to less than 0.015 mg/L and limit any increases in the concentration of 2- MIB.

DOI

地域研究成果の地元住民への還元手法としてのジオツーリズムの検討

本塚智貴, 江種伸之, 吉野孝, 平井千津子, 後誠介（Part： Corresponding author )

Kansai Geo-Symposium 2015論文集 141 - 146 2015.11 [Refereed]

和歌山県東牟婁地域の熊野層群分布域における崩壊・土石流の実態と地形的特徴について

辻野裕之, 江種伸之, 後誠介, 谷垣勝久, 岩瀬信行

Kansai Geo-Symposium 2015論文集 147 - 150 2015.11 [Refereed]

既存施設への薬品注入設備・傾斜管沈降装置導入による濁度改善効果

和田安弘, 保田孝志, 江種伸之, 平田健正（Part： Corresponding author )

水道協会雑誌 84 ( 5 ) 15 - 25 2015.05 [Refereed]

あかりマップ：利用者の移動を考慮した平常時から利用可能な災害時避難支援システム

濵村朱里, 福島拓, 吉野孝, 江種伸之（Part： Last author )

情報処理学会論文誌 56 ( 1 ) 185 - 195 2015.01 [Refereed]

平成23年台風12号による和歌山県東牟婁地域における土石流災害

江種伸之, 辻野裕之, 谷垣勝久, 泉並良二, 矢野晴彦, 加藤智久, 岩瀬信行, 石田優子, 藤本将光, 岩佐直人, 後誠介（Part： Lead author,　Corresponding author )

Kansai Geo-Symposium 2014論文集 179 - 184 2014.11 [Refereed]

地下水循環併用型原位置バイオレメディエーションによる塩素化エチレン類の分解促進効果

丸山裕嗣, 江種伸之, 平田健正, 川原恵一郎（Part： Corresponding author )

土木学会論文集B1(水工学) 70 ( 4 ) I_1117 - I_1122 2014.03 [Refereed]

Classic & contemporary papers of groundwater science (5) Ogata and Banks equation (1961): The best-known analytical solution of one dimensional advective-dispersive equation

EGUSA Nobuyuki （Part： Lead author,　Corresponding author )

Suimontishitukenkyukaikaisi ( Japanese Association of Groundwater Hydrology ) 56 ( 3 ) 251 - 256 2014 [Refereed]

DOI

平成23年台風12号による和歌山県内の土砂災害と雨量の関係

鈴木梨加, 江種伸之, 矢野晴彦, 辻野裕之, 鍋島康之, 後誠介（Part： Corresponding author )

Kansai Geo-Symposium 2013論文集 87 - 90 2013.11 [Refereed]

平成23年台風12号による和歌山県の河川災害について

中西典明, 林和幸, 黒田美里, 泉並良二, 江種伸之（Part： Last author )

Kansai Geo-Symposium 2013論文集 90 - 96 2013.11 [Refereed]

果樹園の月別窒素原単位に基づいた河川水質の季節変化特性に関する数値解析

日野良太, 江種伸之, 石塚正秀, 平田健正（Part： Corresponding author )

土木学会論文集B1 68 ( 4 ) I_607 - I_612 2012 [Refereed]

Effects of Aeration Treatment in Distributing Reservoir of Water Purification Plant on Trihalomethane Reduction

WADA Yasuhiro, YAMAMOTO Tomohiro, OKAMOTO Masami, EGUSA Nobuyuki, HIRATA Tatemasa （Part： Corresponding author )

PROCEEDINGS OF ENVIRONMENTAL AND SANITARY ENGINEERING RESEARCH ( Japan Society of Civil Engineers ) 68 ( 7 ) III_651 - III_661 2012 [Refereed]

The Takihata water purification plant started in August 2003. Trihalomethane concentration in drinking water has been the major issue since the start of the plant operation. Therefore, demonstration experiments were conducted in order to investigate the reduction of the trihalomethane concentration by aeration in a distributing reservoir of the plant. The experimental results showed that the trihalomethane concentration decreased exponentially with increased amount of aeration. Meanwhile, the aeration can not remove organic substances in clear water and so the trihalomethane concentration increases again in a water distribution network. This means that it is important to manage the concentration at the end of the network. Therefore, an estimating equation for the concentration in the network was developped using monitoring data. Model analysis using the estimating equation suggested that the aeration in the distributing reservoir enabled a water supply of good quality in the Takihata waterworks system.

DOI

Influence of Industrial Mass Loads on Total Phosphorus Concentration in River Water:： Effects of the Fifth Regulation of Total Maximum Daily Loading

WADA Yasuhiro, HINO Ryota, EGUSA Nobuyuki, HIRATA Tatemasa （Part： Corresponding author )

Papers on Environmental Information Science ( Center for Environmental Information Science ) 26 55 - 60 2012 [Refereed]

Characteristics of total phosphorus (TP) concentrations in the Kinokawa River were clarified by using existing monitoring data. Numerical analysis to examine mass loads and river water quality were also conducted. The monitoring data showed that the TP concentrations increased markedly in the middle river reaches from 1996 to 2001. The numerical analysis also demonstrated large increases in industrial TP loads from 1996 to 1999, as well as decreases in TP due to reductions in industrial shipments and the promulgation of the fifth regulation of total maximum daily loading. The findings suggested that industrial TP loads and the river flow rate both affected TP concentrations in the river.

DOI

Three-dimensional numerical simulation of groundwater contamination by organoarsenic compounds in Kamisu City, Japan

S. Watanabe, N. Egusa, T. Hirata, N. Yokoyama, Y. Yamazato, M. Morita （Part： Corresponding author )

IAHS Red Book Series : GROUNDWATER QUALITY MANAGEMENT IN A RAPIDLY CHANGING WORLD ( INT ASSOC HYDROLOGICAL SCIENCES ) 342 171 - 175 2011 [Refereed]

The transport processes of groundwater contamination by organoarsenic compounds was examined on a large scale in Kamisu City, Ibaraki Prefecture, Japan, using a three-dimensional numerical simulation. The results of the 3-D numerical simulation revealed that groundwater contamination had spread approx. 3 km downstream from the contaminant source and also that groundwater extraction from industrial wells located downstream of the study area had limited the spread of the groundwater contamination until the operation of some wells stopped.

地下水揚水を併用した原位置封じ込め措置の土壌汚染の拡散防止効果

江種伸之, 姜学妍, 峠和男, 西田憲司, 平田健正（Part： Lead author,　Corresponding author )

地盤工学ジャーナル 6 ( 2 ) 297 - 304 2011 [Refereed]

DOI

Primary Consideration in Calculation Method of Nutrient Emission Factors Based on Mass Balance in Orchard

HINO Ryota, EGUSA Nobuyuki, HIRATA Tatemasa （Part： Corresponding author )

Papers on Environmental Information Science ( Center for Environmental Information Science ) 25 269 - 274 2011 [Refereed]

This study investigates a method to calculate nutrient emission factors using existing in formation based on mass balance in orchard and also evaluated the applicability and availability of the calculated emission factors in the Kinokawa River Watershed. The results showed that it was possible to calculate emission factors for applying for a pollution load and river water quality analysis. Moreover, the advantage of this method is that emission factors could be simply calculated using an amount of fertilizer. That is why the calculation method of emission factors examined in this study makes it easy to estimate the reduction of nutrient runoff based on managing the amount of fertilizer.

DOI

茨城県神栖市で起きた有機ヒ素化合物による地下水汚染機構の解明に関する数値解析

渡辺俊一, 江種伸之, 平田健正, 横山尚秀, 山里洋介, 森田昌敏（Part： Corresponding author )

地盤工学ジャーナル 6 ( 2 ) 383 - 394 2011 [Refereed]

紀の川流域におけるエサキアメンボのパッチ占有モデルによるメタ個体群存続の予測

江種伸之, 徳田裕二, 中尾史郎（Part： Lead author,　Corresponding author )

環境システム研究論文集 38 43 - 52 2010 [Refereed]

茨城県神栖市で起きた有機ヒ素化合物による地下水汚染の実態解明

渡辺俊一, 江種伸之, 平田健正, 横山尚秀, 山里洋介, 森田昌敏（Part： Corresponding author )

地盤工学ジャーナル 5 ( 1 ) 147 - 157 2010 [Refereed]

DOI

帯水層中のメチロシスティス属M株の挙動とトリクロロエチレン分解に関する数値解析

長谷川直紀, 江種伸之, 山本秀一, 川原恵一郎, 平田健正, 岩崎一弘, 矢木修身（Part： Corresponding author )

水工学論文集 54 613 - 618 2010 [Refereed]

有機ヒ素化合物による地下水汚染の挙動解析

渡辺俊一, 姜学妍, 江種伸之, 平田健正, 横山尚秀, 山里洋介, 森田昌敏（Part： Corresponding author )

地盤の環境・計測技術に関するシンポジウム2009論文集 63 - 70 2009 [Refereed]

紀の川流域の生息地におけるエサキアメンボLimnoporus esakiiの空間分布

徳田裕二, 中尾史郎, 江種伸之（Part： Last author,　Corresponding author )

環境システム研究論文集 37 39 - 47 2009 [Refereed]

農業用水取水ルールを考慮した分布型水文流出モデルによる紀の川流出解析

石塚正秀, 江種伸之（Part： Last author )

水工学論文集 52 391 - 396 2008 [Refereed]

DOI

太陽熱を利用した農地消毒時の土中温度の変化特性

江種伸之, 加瀬広大, 山本秀一, 増田吉彦, 平田健正（Part： Lead author,　Corresponding author )

土木学会論文集B 64 ( 4 ) 267 - 279 2008 [Refereed]

DOI

帯水層におけるメタン資化性細菌メチロシスティス属M株の挙動解析

長谷川直紀, 江種伸之, 山本秀一, 川原恵一郎, 平田健正, 岩崎一弘, 矢木修身（Part： Corresponding author )

地盤の環境・計測技術に関するシンポジウム2008論文集 103 - 106 2008 [Refereed]

帯水層における塩素化エチレン類の自然減衰特性解析

江種伸之, 丹波豊, 山本秀一, 平田健正（Part： Lead author,　Corresponding author )

水工学論文集 51 493 - 498 2007 [Refereed]

Metapopulation structure of water-strider, Limnoporus esakii (insecta: gerridae) in the Kinokawa River Watershed

中尾史郎, 江種伸之（Part： Last author )

Papers on environmental information science ( 環境情報科学センター ) 21 99 - 104 2007 [Refereed]

DOI

太陽熱消毒におよぼす土中熱伝導性の影響

加瀬広大, 江種伸之, 増田吉彦, 平田健正（Part： Corresponding author )

地盤の環境・計測技術に関するシンポジウム2007論文集 68 - 73 2007 [Refereed]

PARALLELIZATION OF A SUBSURFACE MASS TRANSPORT NUMERICAL SIMULATION ON PC CLUSTER USING MPI

EGUSA Nobuyuki, SAITO Shoichi, HIRATA Tatemasa （Part： Lead author,　Corresponding author )

Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) ( Japan Society of Civil Engineers ) 63 ( 1 ) 29 - 38 2007 [Refereed]

Throughput of a personal computer (PC) cluster, which is a parallel processing system, is approaching a super computer level due to network speed and PC performance improvements. This study evaluated the availability of a PC cluster on a mass transport numerical simulation in subsurface. Method of Characteristic (MOC) was used as a numerical simulation method. The sequential program of MOC was parallelized using Message Passing Interface (MPI), which is a library specification for message-passing in a distributed memory system. The computing speed of eight node PC cluster was six times faster than that of sequential processing. These result in that the parallelization technique using MPI was effective in shortening of the subsurface mass transport simulation by MOC.

DOI

ソイルセメント系連続地中壁の物理・力学特性と地震応答解析による耐震性能評価

日置和昭, 平田健正, 西垣誠, 江種伸之, 櫛原信

廃棄物学会論文誌 18 ( 4 ) 230 - 239 2007 [Refereed]

土中熱伝導の水分依存性とその定式化

加瀬広大, 江種伸之, 山本秀一, 増田吉彦, 平田健正（Part： Corresponding author )

地盤の環境・計測技術に関するシンポジウム2006論文集 53 - 58 2006 [Refereed]

PREDICTION OF INFLUENCE RADIUS OF VACUUM PUMPING IN UNSATURATED SOIL AND EVALUATION OF AIR PERMEABILITY BY IN SITU VACUUM TEST

HIBI Yoshihiko, JINNO Kenji, EGUSA Nobuyuki, KAWABATA Junichi, SIMOMURA Masanori

Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) ( Japan Society of Civil Engineers ) 62 ( 2 ) 488 - 501 2006 [Refereed]

The coefficient of air permeability and the influence radius are the important indices for the design of remediation of the polluted unsaturated soil. At present, several theoretical formulas have been proposed to estimate the air permeability. However, neither theoretical formulas for estimating air permeability nor the influence radius of vacuum test affected by the volumetric water content are clarified. In the present paper, the solutions by theoretical formulas were compared with numerical solution by the finite element method which considers the compressibility of air and the spatial distribution of volumetric water content. It was revealed that the theoretical formulas were applicable to the actual unsaturated soil where the in situ vacuum test was conducted.

DOI

井戸からのガス吸引による土中空気の定常状態流れの理論解と有限要素法の数値解の比較

日比義彦, 神野健二, 江種伸之, 川端淳一, 下村雅則

土木学会論文集G 62 ( 4 ) 391 - 402 2006 [Refereed]

In-Situ Degradation Effects of Chlorinated Ethenes using Bioremediation

N.Egusa, S.Yamamoto, T.Hirata, K.Kawahara, T.Ozawa, O.Nakasugi （Part： Lead author,　Corresponding author )

Journal of Hydroscience and Hydraulic Engineering 24 ( 1 ) 83 - 92 2006 [Refereed]

帯水層における塩素化エチレン類の一次反応速度定数に関する考察

丹波豊, 江種伸之, 山本秀一, 平田健正（Part： Corresponding author )

地盤の環境・計測技術に関するシンポジウム2006論文集 63 - 66 2006 [Refereed]

Remediation of groundwater contaminated by trichloroethylene using groundwater extraction and effects of natural attenuation

N.Egusa, T.Hirata, Y.Yoshioka, O.Nakasugi （Part： Lead author,　Corresponding author )

IAHS Red Book Series : Bringing Groundwater Quality Research to the Watershed Scale 297 433 - 438 2005 [Refereed]

FIELD TEST ON REMEDIATION OF GROUNDWATER CONTAMINATED BY TETRACHLOROETHYLENE USING IN-SITU BIOREMEDIATION

EGUSA Nobuyuki, HIRATA Tatemasa, KAWAHARA Keiichirou, OZAWA Tetsushi, NAKASUGI Osami （Part： Lead author,　Corresponding author )

Doboku Gakkai Ronbunshuu B ( Japan Society of Civil Engineers ) 49 145 - 150 2005 [Refereed]

This paper evaluated the results of a field test for grou ndwater remediation by in-situ bioremediation at a site contaminated by tetrachloroethylene. The technique carried out in this test uses reductive dechlorination of contaminant in a subsurface environment. In the observation well during the field test, the percentages of daughter products like dichloroethylenes were observed to increase with the rise in reductive condition of the aquifer. Moreover, it was shown that the first order rate constants of all substances became greater than those of natural groundwater by more than a few orders. This meant that the reductive dechlorinataions could be accelerated during the field test.

DOI

トリクロロエチレンの溶解特性に関する物質移動係数の特性

江種伸之, 山本秀一, 平田健正（Part： Lead author,　Corresponding author )

地盤の環境・計測技術に関するシンポジウム2005論文集 25 - 28 2005 [Refereed]

バイオレメディエーション技術を用いた塩素化エチレン類の原位置分解効果

江種伸之, 山本秀一, 平田健正, 川原恵一郎, 小沢哲史, 中杉修身（Part： Lead author,　Corresponding author )

地盤の環境・計測技術に関するシンポジウム2005論文集 41 - 48 2005 [Refereed]

揮発性有機化合物に汚染された地下水の揚水処理による浄化

平田健正, 吉岡昌徳, 江種伸之, 中杉修身（Part： Corresponding author )

土木学会論文集 ( 762/VII-31 ) 91 - 99 2004 [Refereed]

土地利用の異なる隣接した二流域の河川水質特性

江種伸之, 三尾谷雅史, 鷲田勉, 平田健正（Part： Lead author,　Corresponding author )

水工学論文集 48 1471 - 1476 2004 [Refereed]

Natural attenuation of trichloroethylene and dichloroethylene in groundwater remediation site

N.Egusa, T.Kakuo, T.Hirata, Y.Yoshioka, O.Nakasugi （Part： Lead author,　Corresponding author )

Journal of Hydroscience and Hydraulic Engineering 22 ( 2 ) 105 - 110 2004 [Refereed]

The river water quality and estimation of pollutant loads in the Kinokawa catchments

TANIGUCHI Masanobu, II Hiroyuki, EGUSA Nobuyuki, HIRATA Tatemasa, ARAKI Naoya

Doboku Gakkai Ronbunshuu G ( Japan Society of Civil Engineers ) 40 161 - 169 2003 [Refereed]

Water quality of the Kinokawa River has not been satisfied with the Japanese environmental quality standard. Then, origins of pollution of Kinokwa River were analyzed by L-Q equation and pollutant load per unit production using a field survey result and previous data. As a result, BOD and T-N values calculated from L-Q method were in good agreement with those calculated from pollutant load unit production method. The difference of T-P values between two methods was twice. Pollutant load source was estimated by pollutant load per unit production method. Main sources of BOD, T-N, and T-P in Kinokawa catchments were estimated to be domestic sewage, orchard, and industrial wastewater respectively. Comparing lower and upper stream of Kinokawa catchments, main sources of BOD and T-P in the upper stream were forest. Main sources of BOD and T-P in the lower stream were domestic sewage and industrial wastewater. Main sources of T-N in both streams were orchards. Therefore, each main source was various and comprehensive plan is necessary for controlling river water quality.

DOI

地下水汚染浄化対策現場における揮発性有機化合物の自然減衰効果

江種伸之, 角尾隆, 平田健正, 吉岡昌徳, 中杉修身（Part： Lead author,　Corresponding author )

水工学論文集 47 307 - 312 2003 [Refereed]

大阪府石川流域における河川水質と土地利用の関係について

井伊博行, 平田健正, 江種伸之, 長谷部正彦, 坂本康, 粂川高徳, 西山幸治, 酒井信行

河川技術論文集 8 523 - 527 2002 [Refereed]

森林および果樹園からの無機イオン類の流出が河川水質に与える影響について

江種伸之, 鷲田勉, 平田健正（Part： Lead author,　Corresponding author )

水工学論文集 46 893 - 989 2002 [Refereed]

水分飽和多孔体へ注入した空気の移動と溶解特性

江種伸之, 中藤康拓, 生原功一, 平田健正（Part： Lead author,　Corresponding author )

地下水学会誌 44 ( 4 ) 285 - 294 2002 [Refereed]

CHARACTERISTIC OF RIVER WATER CHEMISTRY IN THE YAMATOGAWA BASIN

KUBOHARA Takuma, II Hiroyuki, HIRATA Tatemasa, EGUSA Nobuyuki, ISHIZUKA Masahide, ISE Tatsuo, MIYAGAWA Yuji

Doboku Gakkai Ronbunshuu B ( Japan Society of Civil Engineers ) 45 985 - 990 2001 [Refereed]

The flux of NO-3 and BOD values in the Yamato river water directly increased with precipitation. Therefore, the NO-3 was considered to originate mainly from fertilizer (A) because it was reported that the flux of NO-3in farmland drainage increased with precipitation, although domestic sewage (B) also contains a lot of NO-3. As sediments in the river channels and drains containing organic compounds migrated on rainy days, river BOD values are considered to increase after rain. On the other hand, NO-3origins in branch rivers of the Yamato river are various combinations of (A) and (B). The NO-3origins of branch rivers were determined by whether the flux of NO-3 increased with the flow rate or not. On the other hand, CF concentration in the Yamato river water is considered to strongly depend on the amount of domestic sewage. Although the flow rate in the river changed remarkably due to heavy rains, the flux of CF remained unchanged because the volume of domestic sewage did not change even on a rainy day.

DOI

水分飽和多孔体へ注入した空気の移動に関する室内実験

江種伸之, 中藤康拓, 平田健正（Part： Lead author,　Corresponding author )

水工学論文集 45 319 - 324 2001 [Refereed]

Comparison of the Water Chemistry in the River Basin of Different Land Use and Geologic Structure. The Satsunai and Ishikawa River Basin.

HASEBE Masahiko, KATO Tomomi, KUMEKAWA Takanori, HIRATA Tatemasa, II Hiroyuki, EGUSA Nobuyuki, SAKAMOTO Yasushi

Doboku Gakkai Ronbunshu ( Japan Society of Civil Engineers ) 2000 ( 663/II-53 ) 131 - 136 2000 [Refereed]

It is important that it makes clear the cyclic process of water and water balance for the river basin. However water quality was changed by types of land use and geologic structure. In this study, we have compared the water chemistry of the Ishikawa river which land for housing makes rapid progress, with that of the Satsunai river which there are almost agricultural land. In the Satsunai river, the NO3- concentration found in the middle stream water of farmland were thought to have come from fertilizer. The Cl- concentration is influenced the difference of population in the river basin. By analysis of oxygen and hydrogen isotopic ratios, the effect of geographic latitude is confirmed by comparing the Ishikawa river basin with the Satsunai river.

DOI

地下水中への空気注入による揮発性有機化合物の除去効果について

江種伸之, 塩谷剛, 平田健正, 福浦清, 松下孝（Part： Lead author )

環境工学研究論文集 37 279 - 286 2000 [Refereed]

Long term field test on air sparging performance

N. Egusa, T. Hirata, K. Fukuura, T. Matsushita （Part： Lead author,　Corresponding author )

Journal of Hydroscience and Hydraulic Engineering 18 ( 1 ) 39 - 44 2000 [Refereed]

環境同位体及び化学組成からみた石川流域の河川水と地下水の起源について

井伊博行, 平田健正, 長谷部正彦, 江種伸之, 坂本康, 粂川高徳, 西山幸治, 酒井信行, 堀井壮夫

水工学論文集 43 205 - 210 1999 [Refereed]

地下水中への長期間の空気注入による汚染物質濃度変化について

江種伸之, 平田健正, 福浦清, 松下孝（Part： Lead author,　Corresponding author )

水工学論文集 43 193 - 198 1999 [Refereed]

土地利用特性の河川水質に及ぼす影響 -大阪府石川流域-

平田健正, 井伊博行, 長谷部正彦, 江種伸之, 坂本康, 粂川高徳, 酒井信行, 岩崎宏和

土木学会論文集 ( 614/II-46 ) 1999 [Refereed]

地下水中に注入された空気の移動特性および汚染物質の濃度変化について

江種伸之, 平田健正, 福浦清, 松下孝（Part： Lead author,　Corresponding author )

水工学論文集 42 349 - 354 1998 [Refereed]

A STUDY ON INVESTIGATION OF WATER CYCLE PROCESS IN THE ISHIKAWA RIVER

HASEBE Masahiko, HIRATA Takemasa, II Hiroyuki, SAKAMOTO Yasusi, EGUSA Nobuyuki, KUMEKAWA Takaniri, NISHIYAMA Kouji, SAITOU Nobuhiko, NAMATAME Norikazu

PROCEEDINGS OF HYDRAULIC ENGINEERING ( Japan Society of Civil Engineers ) 42 307 - 312 1998 [Refereed]

It is important that it makes clear cyclic process of water and water balance in urban river. But, the process of water cycle and water balance have not been made clear in the hydrologic system, because many factors are each other influenced complicatedly and that it is not elucidated in real basin. In this study, we attempt to clarity the process of water cycle in a watershed of the Ishikawa river with a discharge area of 220 km2 by environmental isotope tracers. Both geochemical data which are EC, δ18 O etc. and river discharge are directly measured at many points. As result, it is obvious that cyclic process of river water and water balance are grasped through geochemical data and field observation from macroscopic point.

DOI

Cost efficiency of subsurface remediation using soil vapor extraction and groundwater extraction

T. Hirata, N. Egusa, O. Nakasugi, S. Ishizaka, M. Murakami

Water Science and Technology ( Elsevier Sci Ltd ) 37 ( 8 ) 161 - 168 1998 [Refereed]

The groundwater pollution due to volatile organochlorines like trichloroethylene and tetrachloroethylene has been a great environmental issue in Japan. The nation wide survey revealed on the basis of up to fifty-nine thousand samples collected until 1995 that 1.5% for trichloroethylene and 2.3% for tetrachloroethylene cannot meet the drinking water standard. In order to repair subsurface pollution and to establish the integrated procedure for cost-benefit remediation measure, physical remediation technologies of soil vapor extraction and groundwater extraction were applied to a study site contaminated with trichloroethylene. The results showed that the trichloroethylene amounts of 472 kg by soil vapor extraction and 1764 kg by groundwater extraction were removed during three-year operation. In addition experience with both technologies has demonstrated that the soil vapor extraction has been successful in removing 1 kg hr-1 of trichloroethylene at the initial stage of remediation, which shows one order as high as the groundwater extraction. However, the removal rate due to soil vapor extraction declines much earlier than groundwater extraction, and consequently the removal rates of both technologies develop inversely with the progress of remediation. Such remediation behavior of technologies raised the relative cost for soil vapor extraction 15 times as high as groundwater extraction.

DOI

地下水中へ注入された空気による水質回復の影響について

江種伸之, 平田健正, 福浦清, 松下孝（Part： Lead author,　Corresponding author )

地下水学会誌 40 ( 4 ) 417 - 428 1998 [Refereed]

降雨浸透の影響を考慮した不飽和土壌中における有機塩素化合物の鉛直輸送特性について

江種伸之, 平田健正, 唐常源（Part： Lead author,　Corresponding author )

水工学論文集 41 569 - 574 1997 [Refereed]

Numerical simulation for transport of chlorinated hydrocarbons with gas advection and diffusion in unsaturated zone

N.Egusa, K.Jinno （Part： Lead author )

Journal of Hydroscience and Hydraulic Engineering 14 ( 2 ) 97 - 104 1996 [Refereed]

土壌ガス吸引と地下水揚水を併用した地下環境汚染の修復

平田健正, 江種伸之, 中杉修身, 石坂信也

環境工学研究論文集 33 47 - 55 1996 [Refereed]

不飽和土壌中でのガス流動を考慮した有機塩素化合物の輸送特性解析

江種伸之, 神野健二（Part： Lead author )

水工学論文集 39 349 - 354 1995 [Refereed]

土壌ガス吸引時における有機塩素化合物ガスの挙動について

江種伸之, 神野健二（Part： Lead author )

地下水学会誌 37 ( 4 ) 245 - 254 1995 [Refereed]

ガス拡散を考慮した有機塩素化合物の不飽和-飽和領域における輸送特性解析

江種伸之, 神野健二, 鷲見栄一（Part： Lead author )

土木学会論文集 ( 502/II-29 ) 167 - 176 1994 [Refereed]

A HYDROGEOLOGICAL STUDY OF GROUNDWATER POLLUTION BY TETRACHLOROETHYLENE

N EGUSA, K JINNO, K NAKAMUTA, H HIRONAKA, Y MATSUFUJI, T ISHIBASHI （Part： Lead author )

IAHS Red Book Series "TRACERS IN HYDROLOGY” ( INT ASSOC HYDROLOGICAL SCIENCES ) ( 215 ) 125 - 134 1993 [Refereed]

トリクロロエチレンの自然河床区間から地下水系への浸透特性について

江種伸之, 神野健二, 籾井和朗, 鷲見栄一（Part： Lead author )

水工学論文集 36 391 - 396 1992 [Refereed]

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