Study on Potential Influence of Runoff on Observatory-Based Watershed in Japan
Study on Potential Influence of Runoff on Observatory-Based Watershed in Japan
复制标题
日本观测站流域径流的潜在影响研究
DOI：
10.5539/jsd.v12n4p19
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
S. Eguchi
中科院分区：
文献类型：
--
作者：
Donglai Ma;S. Yoshikawa;Yoshiaki Ohsawa;Tadamasa Saito;Masahiro Kobayashi;S. Eguchi
土地利用体现了人类与自然的相互作用，其对径流的影响已受到全球关注并需要更多的研究。然而，流域数据库通常仅适用于非常大的尺度，尚未适应小尺度。本文提出了一种基于官方观测点数据位置的日本小流域流域划分和径流潜在影响评估的方法。利用D8算法和日本10 m×10 m DEM数据对流向、流量累积、急倾点和流域识别进行了分析。以50 m的急倾点距离为输入值，圈定了3831个流域，建立了全国流域数据库。根据日本国土交通省第521号通知的建议和JAXA卫星Alos-2的土地利用/土地覆盖数据，采用加权平均法计算综合径流系数（CRC），并使用ArcGIS按等间隔法分为10个等级。获得的分水岭边界线与占日本一半以上的山区的山脊线几乎相同。东京和大阪等大城市的 CRC 值最高，表明这些城市受到径流的影响最大。研究成果可为流域管理决策提供技术支撑。小规模流域数据库的建立将为后续区域可持续发展的防洪、缺水、生物地球化学循环等研究提供基础资料。
Land use shows the interaction between human and nature, and its impacts especially on runoff have received global attention and required more research studies. However, watershed database is generally available only for very large scales and not yet adapted to small scales. This paper presents a methodology for watershed delineation and potential influence assessment of runoff on the small watersheds in Japan based on the locations of the official observatory point data. Flow direction, flow accumulation, snap pour point and watershed recognition were analyzed by using the D8 algorithm and 10 m × 10 m DEM data of Japan. Totally 3831 watersheds were delineated by defining snapping pour point distance of 50 m as the input value, and the nation-wide watershed database was established. According to the suggestion of Notification No. 521 from the Ministry of Land, Infrastructure and Transport of Japan and land use/land cover data from JAXA satellite Alos-2, comprehensive runoff coefficient (CRC) was calculated by the weighted average method and divided into 10 levels by the equal interval method using ArcGIS. The obtained watershed boundary lines were almost identical to the ridge lines in the mountain area which accounts for more than half of Japan. The CRC values in the biggest cities such as Tokyo and Osaka were the highest, indicating these cities would receive the highest impacts of runoff. These results can provide the technical support for the decision-making on watershed management. The creation of small-scale watershed database would provide basic materials for the subsequent research such as flood prevention, water shortage and biogeochemical cycle of the sustainable regional development.
影响因子：
5.2
作者：
Mori, Nobuhito;Takahashi, Tomoyuki;Yanagisawa, Hideaki
通讯作者：
Yanagisawa, Hideaki