降雨分布特性が出水波形特性に及ぼす効果-要素的直接流出場の水理モデルの解析解による検討-

Abstract

As a fundamental study approaching to the effect estimation problems of nonuniformity ofrunoff-fields and inputs in runoff analysis or calculation, the following items are carried out set-ting runoff problem from the three kinds of elementary direct-runoff-fields model; square slope(SS), converging cone(CC), and diverging cone(DC), under the four kinds of rainfall distributionmodel; uniform in time and space(UU), triangle in time and uniform in space(TU), uniform intime and triangle in space(UT), and triangle in time and space(TT) (1) Application of thekinematic wave theory and searching the cases in which exact solutions are obtainable, and get-ting the solutions under normalization. (2) Comparison of normalized hydrographs, especiallyits peak and peak-time in relation to properties of rainfall and fields or runoff delay factor.(3) Investigation of properties of concentration time for peak discharge and the minimumconcentration time, and examination of 'rational formula', using the exact solutions for SS underTU.Some interesting and suggestive results are obtained by these approach.