直交座標系での地形情報の表現とその洪水氾濫への適用について

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  • チョッコウ ザヒョウケイ デ ノ チケイ ジョウホウ ノ ヒョウゲン ト ソノ コウズイ ハンラン エ ノ テキヨウ ニ ツイテ
  • An example of expression for geographical information with the orthogonal grid system and its application to the overland flow

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In this paper, numerical procedures for expressing the geographical information, such are land use and land height are introduced for the purpose of applying the data to the overland flow. With the fine geographical information, obtained by making use of the method a numerical simulation of overland flow in an urban area is carried out. The numerical model adobpted is two-dimensional shallow water model. The grid size is 1m, which is fine enough to understand overland flow in an urban area. The altitude data is obtained by the land heights of lid of manholes distributed randomly in the study area. The resolution of the altitude data is 1cm, which is fine enough to represent minute change of altitude in a flat urban area. The numerical results proved that the overland flow is sensitively affected by the geophysical features with undulation in the area.

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