河域地形構成要素の平面量の分布特性に関する研究

Abstract

For establishment of a general theory on the formation process of flood hydrographs in riverchannel networks, it will be one of the necessary things to grasp the statistical properties of struc-ture of a river basin geometry.From this point of view, statistical analysis of a river basin geometry was carried out mainlyto clarify the characteristics of the frequency distributions of planimetric properties of stream.Links, which are structural elements of a river basin geometry, for sub-basin of River Daido ofShiga Prefecture, Japan, using some other published data for comparison.The main results are as follows: 1) The characteristics of frequency distributions of plani-metric properties of interior links are clearly differs from those of exterior links. 2) The lognor-mal distribution fits the data of exterior link lengths and associated areas reasonably well. 3)The gamma or Weibull distribution fits the data of interior link lengths. 4) The Weibulldistribution may fit the data of interior associated areas. 5) Any known mathematical dis-tribution dose not fit the data of drainage densities and shape indices of links.