Faculty Profiles - HARA Yuji

Published Papers - HARA Yuji

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Landfill development in the urban fringe of Metro Manila

Yuji Hara, Kazuhiko Takeuchi, Armando M. Palijon, Akinobu Murakami （Part： Lead author,　Corresponding author )

GeoJournal 71 ( 2-3 ) 127 - 141 2008.05 [Refereed]

In low-lying areas of urban and suburban regions in Asia, the use of landfill has allowed urban land use to encroach onto watery landforms, such as back marshes, which were formerly used as rice fields. To improve understanding of the associations between land-use patterns and landfill development, we carried out a case study in the urban fringe of Metro Manila in the Philippines. We examined landfill volume derived from land-use change using GIS, and field surveyed qualitative aspects of the landfill used. We calculated the rate of application of landfill in low-lying housing development areas to be 5.0 × 10^3 m3 km-2 year-1, most of which consisted of offsite disposal of construction waste or crushed rock produced by urban development and renewal on the adjoining uplands. The flow of fill material from offsite sources to onsite landfill development areas was on the basis of individual agreements between suppliers and developers.

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Landform transformation on the urban fringe of Bangkok: The need to review land-use planning processes with consideration of the flow of fill materials to developing areas

Yuji Hara, Danai Thaitakoo, Kazuhiko Takeuchi （Part： Lead author,　Corresponding author )

LANDSCAPE AND URBAN PLANNING ( ELSEVIER ) 84 ( 1 ) 74 - 91 2008.01 [Refereed]

For large Asian cities situated on deltaic lowlands, landform transformation is essential for both agrarian and urban development. Understanding landform transformation processes and patterns is important for landscape planning in areas of mixed urban-rural land use on the periphery of these cities. We examined landform transformation processes and patterns in Bangkok at three scales: (1) meso-scale quantitative landform analysis on the urban fringe of Bangkok using aerial photograph interpretation and topographic measurements; (2) micro-scale field measurements in sample districts to investigate relationships between building styles and the types of fill material used; (3) macro-scale analysis of the flow of fill material from source areas outside Bangkok to end use on the urban-rural fringe of the city. Our study showed that the type and the cumulative volume of fill material used are related to past agricultural land-use patterns, which in turn are related to the pre-existing natural local environment. We found associations between building styles and types of fill material used: townhouses are built on clay fill foundations, whereas condominiums and roads with heavy traffic loads are built on sand fill. Each type of fill has a different flow from source to end use that is influenced by geologic and economic conditions. The flow of clay fill is limited to the meso-scale urban fringe area, whereas sand fill travels from sand pits on a natural sand levee 100 km upstream from its end use on the urban fringe. The sand output at its source was estimated to be 1.5 x 10(5) m(3) day(-1), which, depending on cost, is either trucked or transported by river to the urban fringe development areas. Thus, landform transformation was found to occur at multiple scales in the Bangkok region, and the delta is no longer flat. These findings suggest that deltaic landscape planning should incorporate the means of managing the flow of fill material from source pits to end use in urban fringe development areas.

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Recycling-oriented Society and Urban-rural Sustainability in Asian Mega-cities

TAKEUCHI Kazuhiko, HARA Yuji

JOURNAL OF RURAL PLANNING ASSOCIATION ( THE ASSOCIATION OF RURAL PLANNING ) 25 ( 3 ) 201 - 205 2006.09

Urban-rural land-use mixture is a common phenomenon in the fringe areas of Asian large cities. Although the current spatial planning system in various cities attempts to separate urban from rural land uses, the land-use mixture is expected to have advantages in many phases, particularly in bio-resource utilization. Referring to the cases of Japan, Thailand and China, we discuss the hierarchical structure of biomass flows and urban-rural land uses. We suggest that the Asian land-use mixture has high potential for bio-resource utilization, thereby contributing to urban-rural sustainability in Asian cities.

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Urbanization linked with past agricultural landuse patterns in the urban fringe of a deltaic Asian mega-city: A case study in Bangkok

Yuji Hara, Kazuhiko Takeuchi, Satoru Okubo （Part： Lead author,　Corresponding author )

Landscape and Urban Planning 73 ( 1 ) 16 - 28 2005.08 [Refereed]

Urban sprawl areas as mixtures of urban and rural landuses are being created increasingly rapidly in the suburbs of the mega-cities located on Asia's river deltas. These landuse changes are causing serious environmental problems and dynamic urban growth controls are urgently needed. We examined landuse changes in the suburbs of Bangkok, and focused on the landform transformation that is inherent on deltas where the landuse is shifting from paddy fields to urban dwellings. The research was conducted through aerial photograph interpretation and field measurements. GIS was used for data analysis. We confirm that the present pattern of urban landuse has been profoundly influenced by past agricultural landuses, which in turn were adapted to the natural local environment. Areas subject to rice plantations with linear canal systems are occupied by townhouses, whereas areas subject to paddy fields with irregular canal systems are occupied by slum-type housing. Transect surveys indicate that the local people have responded to flooding expertly through artificial landform transformation. There was a statistical association between landlevel and landuse type. The volume of landform transformation that has occurred over the last half-century was calculated at 3.2 × 10^7 m3, equivalent to 64 km2 of area flooded to an average depth of 50 cm. Thus, landuse change has both horizontal and vertical components, which cannot be separated from each other. From these results, it is clear that past patterns of agricultural landuse and landform transformation are keys to effective landscape planning for mega-cities on the deltas of Asia.

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Flood hazard response to the urbanized bank up areas of Laguna Lacustrine Plain, Metro-Manila.

HARA Yuji, HARUYAMA Shigeko, OKUBO Satoru, TAKEUCHI Kazuhiko （Part： Lead author,　Corresponding author )

JOURNAL OF RURAL PLANNING ASSOCIATION ( THE ASSOCIATION OF RURAL PLANNING ) 21 ( suppl ) 19 - 24 2002.11 [Refereed]

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Observation of mammal appearance patterns using multiple motion sensor cameras in the campus site of Wakayama University

木本, 有紀, 原, 祐二, 三瓶, 由紀（Part： Corresponding author )

南紀生物 ( 南紀生物同好会 ) 66 ( 1 ) 72 - 77 2024.06 [Refereed]

Detections of landform changes by SfM/MVS using various types of aerial images : toward establishing process toolkits

原祐二, 登城太智（Part： Lead author,　Corresponding author )

紀州経済史文化史研究所紀要 ( 和歌山大学紀州経済史文化史研究所 ) 44 21 - 42 2023.12 [Refereed]

Recent rapid growth of SfM/MVS technology allows researchers without deeper skills of photogrammetry to detect landform changes at multiple spatiotemporal scales. Here we report our recent projects quantifying landform changes using downloadable aerial photos and self-acquired drone images with special focus on its practical processes. Our trials were able to detect landform changes with reliable accuracies to use for ordinary academic classes and landscape level research. This practical report could contribute to future research in other study areas and academic fields.

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Development of sustainable ecosystem monitoring in Mo-Ko satoyama valley in Wakayama, central Japan

原祐二（Part： Lead author,　Corresponding author )

Reports of research assisted by the Asahi Glass Foundation ( 旭硝子財団 ) 91 ( 77 ) 1 - 10 2022

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保全優先度の高い棚田を選定するモデルの構築と事例分析

大場悠暉, 山本祐吾, 吉田登, 原祐二, 三瓶由紀

紀州経済史文化史研究所紀要 42 51 - 66 2021.12 [Refereed]

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Distribution of grasshoppers in the suburban shopping mall : an example for developing an indicator toward green space planning

Yuji Hara, Kansei Harada, Yuki Sampei （Part： Lead author,　Corresponding author )

南紀生物 63 ( 1 ) 101 - 106 2021.06

「敷地外緑地制度」を活用した地域環境整備を考える

三瓶由紀, 原祐二（Part： Last author )

グリーン・エージ ( 563 ) 2020.12 [Invited]

Relationship between the tree vigor of dogwood (<i>Cornus florida</i>) street trees and street configuration in Tokyo

YAMADA Daiki, UCHIDA Kei, TSUCHIYA Kazuaki, ICHIKAWA Kaoru, HARA Yuji, HENRY Brian P., OKURO Toshiya

Landscape Research Japan Online ( Japanese Institute of Landscape Architecture ) 13 ( 0 ) 94 - 99 2020 [Refereed]

Street trees, which play a certain role in alleviating problems in urban areas, are experiencing the poor growth due to the stress in the urban environment. Therefore, it is necessary to grasp the environmental factors that affect the growth of street trees. In this study, we analyzed the relationship between the degree of decline and street configuration among 2,615 dogwoods planted along the streets in Tokyo. As a result of our analysis, in the area where the buildings were tall, the tree vigor tends to be poor and in the area where the planting type was planting zone rather than planting pot, the tree vigor was tend to be good, in whole Tokyo area. Outside Tokyo 23 wards, there was a tendency for good tree vigor in the area where the road width was wide and the street trees were facing south. In Tokyo 23 wards where tree vigor has deteriorated since 2006, the buildings were tall and the roads width was also narrow. The results of this study show the possibility the effects of sunshine on the dogwood tree vigor are large in the wide areas. In particular, the height of the buildings and road width were regarded as significant factors where the tree vigor was actually degraded.

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人と土がつなぐ防災ランドスケープ

原祐二, 平田隆行（Part： Lead author,　Corresponding author )

E-journal GEO ( 公益社団法人日本地理学会 ) 14 ( 1 ) 99 - 104 2019.03 [Invited]

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Land-Use Changes in the Landlocked Sandbar

Shigeya SHIIKI, Yuji HARA, Yuki SAMPEI （Part： Corresponding author )

Bulletin of Institute of Kishu Economic and Cultural History Wakayama University ( 和歌山大学地域活性化総合センター紀州経済史文化史研究所 ) 39 1 - 16 2018.12 [Refereed]

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Field Realities of Urban-Rural Interaction Studies in Asian Mega Cities since 2000s

Yuji HARA （Part： Lead author,　Corresponding author )

Journal of Rural Planning Association ( 農村計画学会 ) 37 ( 2 ) 122 - 125 2018.09 [Invited]

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The possibility of the policy instruments for Satoyama landscapes conservation

Yuki SAMPEI, Yoshiko KITAGAWA, Yuji HARA （Part： Last author )

The Nanki seibutsu 60 ( 1 ) 126 - 132 2018.06

MAXIMIZING ORDINARY LOCATION ENVIRONMENT AND ECOSYSTEM OF SUBURBAN UNIVERSITY WITH CUT-FILL LAND DEVELOPMENT IN JAPAN FOR DISASTER PREVENTION RESEARCH AND EDUCATION : A CASE IN WAKAYAMA UNIVRSIT

Yuji HARA, Hiroto TANOUCHI （Part： Lead author,　Corresponding author )

Research reports of the Center for Education and Research of Disaster Science, Wakayama University ( 和歌山大学災害科学教育研究センター ) 2 50 - 54 2018.03

1980年代バブル経済による中心市街地の地価高騰に対応して，多くの大学キャンパスが郊外丘陵・山地に移転した．新キャンパスは切り盛り地形改変を伴う土地造成により建設された．誘発された周辺宅地開発とあわせ，従前の地域生態系を劣化させた．その後の景気低迷により開発圧が低下する中，郊外キャンパスは里山管理の担い手供給源としての価値も認められる．本報告では，和歌山市郊外の和泉山脈山麓に立地する和歌山大学栄谷キャンパスにおいて，和歌山大学システム工学部学生を主な対象に，キャンパスの立地環境を活用した防災・生態系実習の取り組み内容と経緯を紹介する．GISを活用した新旧地形図比較による土地造成の定量化，UAV(ドローン)を用いた地形変化量の計測，植生調査による環境負荷の計量を通じ，地域生態系を防災・環境の観点から評価するものである．これらの実習成果を時系列で蓄積していくことで，地域生態系モニタリング研究の一助ともなることが期待される．

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Minabe-Tanabe Ume System: Its Landscape Characteristics and Dynamic Conservation Measures

Yuji HARA, Yuki SAMPEI （Part： Lead author,　Corresponding author )

Journal of The Japanese Institute of Landscape Architecture 81 ( 3 ) 282 - 283 2017.10 [Invited]

Distribution of Luciola cruciata in Wakayama City

Daisuke SENGA, Atsushi NAKASHIMA, Tomoko MIYAGAWA, Yuji HARA （Part： Last author )

The Nanki seibutsu 59 ( 1 ) 22 - 26 2017.06

UNDERSTANDING OF LAND-USE CHANGES FOR THE ESTABLISHMENT OF RESILIENT SOCIETY AGAINST TYPHOON YOLANDA AND FUTURE NATURAL DISASTERS IN TACLOBAN CITY

Tasuku OHSUGI, Yuji HARA, Kazuaki TSUCHIYA, Akinobu MURAKAMI, Armando PALIJON （Part： Corresponding author )

Research reports of the Center for Education and Research of Disaster Science, Wakayama University ( 和歌山大学災害科学教育研究センター ) 1 ( 1 ) 45 - 52 2017.03

本研究では2013年台風ヨランダによって壊滅的な被害を受けたフィリピンレイテ島タクロバン市を事例として，地理情報収集と現地調査により，被災強度と地形，土地利用変化との関係を検証し，現地性の高いレジリエントな防災土地利用計画のあり方を検討した．結果として，低湿地にはスラムが拡大し必然的に大きな被害を受けたものの，被災直後から迅速に瓦礫を再利用してスラムを再構築しており，低湿地にマングローブ防潮林を再植林する防災計画は非現実的と考えられた．フィリピンの主要な住宅供給形態であるサブディビジョンは多様な微地形に立地しており，やはり低湿地で被害が大きかったものの，最低限のインフラは整備されており，地区内には多くの空地も分布していた．スラムの遠隔地高台移転計画は，生業・職住近接の面から円滑に進むとは考えにくく，サブディビジョン内の空地など既存インフラの活用と社会制度の改善を進めることも，将来のレジリエントな土地利用の実現にも資すると考えられた．

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Published Papers - HARA Yuji