著者

伊藤 渚生 板川 暢 一ノ瀬 友博

出版者

公益社団法人 日本造園学会

雑誌

ランドスケープ研究(オンライン論文集) (ISSN:1883261X)

巻号頁・発行日

vol.11, pp.1-8, 2018-01-04 (Released:2018-02-22)

参考文献数

37

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In this paper, we aim to reevaluate the difficult-to-evacuate zone, and clarify the current problems of evacuation in Kamakura City. First, evaluation of the tsunami evacuation buildings was done by comparing with the building height and with the maximum reference water level of Tsunami. Next, setting the evacuation target point to where people could escape out of the flooded area, we calculated the evacuation possible area by using 2 indexes, referring to the guideline of evacuation buildings. Moreover, by utilizing reach area analysis of Network Analysis extension by ArcGIS 10.3, we created the area based on the road and defined the evacuation possible area. The other areas were defined as the difficult-to-evacuate zone. And we calculated how many people would have the difficulty to evacuate and verified the landscape district. As a result, we found out that there are areas having the necessity to be assigned evacuation buildings, areas needing a review of landscape district, and areas that need new roads to become the evacuation route while in times of tsunami.

著者

板川 暢 一ノ瀬 友博

出版者

社団法人 日本造園学会

雑誌

ランドスケープ研究(オンライン論文集) (ISSN:1883261X)

巻号頁・発行日

vol.11, pp.32-38, 2018-05-09 (Released:2018-05-23)

参考文献数

24

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We investigated the migration range of Calopteryx atrata Selys (Odonata: Calopterygidae) using the mark and recapture method in Akuwa River and Ooka River which run through the urban area of Yokohama City, Kanagawa Prefecture, Japan. 286 individuals were marked and released at four spots, and 64 marked individuals were recaptured after several days. Initial findings showed that the maximum total migrant distance was 1319 meters, and the average was 323 meters. The individuals that migrated upper stream were more than those in the lower stream, and the migration range to upper was significantly longer than to the lower. Secondly, we analyzed the factors that promote or stunt the migration of C.atrata by GLMM with random effect. Results showed that survival days from release, the area of lower riverbed and coverage of shade were positively correlated with total migration distance. Meanwhile, the coverage of three types of the aquatic plant commonly had a negative correlation with the total migration distance. Also, the coverage area ratio of forest around rivers partly promotes the migration distance of C.atrata, if values of factors were added up in a more wide range from the release spot. The study’s results showed that continuously establishing preferred riparian habitats with aquatic vegetation and a conservation of forests close to rivers enhance C.atrata’s large migration and expanded habitats.

著者

板川 暢 樋口 陽平 一ノ瀬 友博 横山 勝英

出版者

社団法人 日本造園学会

雑誌

ランドスケープ研究(オンライン論文集) (ISSN:1883261X)

巻号頁・発行日

vol.10, pp.37-46, 2017-02-09 (Released:2017-02-24)

参考文献数

32

被引用文献数

1

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This survey monitored the quantity and distribution of egg clutches of Tohoku salamander (Hynobius lichenatus) in the tsunami inundated lowland area from the period 2012 to 2015, looking at the case of Moune district, Kesennuma city, Miyagi prefecture, Japan. After the 2011 Tohoku Earthquake, lowland area almost changed into wetlands by erosion and land subsidence, and seawater ran into a part of the lowland. Lots of egg clutches were found in the whole area in 2012. However several egg clutches deposited in brackish-water were dead. After 2013, the number of egg clutches declined, and the distribution moved inland. The number of egg clutches roughly increased in 2015, indicating the meta-population of Tohoku salamander’s resilience against temporary disturbance caused by the tsunami. Models of relations analyzed between the numbers of egg clutches in each year showed larger population had higher resilience and the numbers of dead egg clutches had negative correlation to the total numbers of egg clutches in late years. Results indicated that the environmental changes after the tsunami had more severe impacts on the population’s survival. However the population of Tohoku salamander had resilience under the natural state. This resilience may be weakened by man-made induced environmental changes and habitat loss from the tsunami recovery and reconstruction works. Hence, the need for conservation and monitoring was suggested.

著者

孫 可冀 一ノ瀬 友博 土光 智子 陳 文波 板川 暢

出版者

一般社団法人 環境情報科学センター

雑誌

環境情報科学論文集 Vol.28(第28回環境情報科学学術研究論文発表会)

巻号頁・発行日

pp.71-76, 2014 (Released:2014-12-03)

参考文献数

19

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ヨシ群落の効率的な生育管理を実現するため,広域的なモニタリング手法の開発が期待されている。 本研究は,中国向海(シャンハイ)湿地のヨシ群落を対象にし,現地調査データと衛星画像データの両方を使用し,ヨシの在・不在,草高,茎径,稈密度の四つの予測モデルを開発した。最適モデルの結果により, ヨシの生育に最も影響している指標は水分条件と傾斜角であることがわかった。この結果を踏まえて, 保全策を検討する基礎資料として, 2010年の向海湿地のヨシ群落の生育予測図を作成した。

著者

板川 暢 片桐 由希子 一ノ瀬 友博 大澤 啓志 石川 幹子

出版者

公益社団法人 日本造園学会

雑誌

ランドスケープ研究 (ISSN:13408984)

巻号頁・発行日

vol.73, no.5, pp.431-436, 2010 (Released:2011-07-22)

参考文献数

24

被引用文献数

3 3

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A study was conducted on Orthoptera (Acrididae, Tettigoniidae, Gryllidae) in 56 sites of reclaimed land of Kanazawa District, Yokohama City, Kanagawa Prefecture through May to October of 2008. 28 species and 1941 individuals were recorded during this study. By using TWINSPAN and partitioning, classifications of the Orthoptera and study sites were made based on the results of this study. Also we investigated concerning vegetation, soil, distance from original land,and area coverd with vagetation around field as environmental factors. The study sites were sorted into 5 groups and the Orthoptera were sorted into 4 groups by using TWINSPAN. Based on 5 study site groups, partitioning analysis was conducted.Results suggest vegetation height, coverings of evergreens and deciduous trees of middle to high height, and distance from original land are related to Orthoptera inhabitation. However, it has not been clearly understood the distance from original land was selected as explanatory variable. A further verification is necessary because of the possibility that area coverd with vegetation around the field is related was suggested.