土地利用形態と出水特性-ゴルフ場・放牧草地の場合-

Abstract

The characteristics of flood runoff in the Taiko-daira golf course, Kyoto, of 0.051 km2and the Tsudaka pastureland, Okayama, of 0.23 km2 are examined in this paper, to getfundamental data for establishing the methodology for the prediction of runoff changes dueto the development of watersheds. The results obtained are summarized as follows.(1) The retention capacity of rainwater in the golf course is almost the same as orlarger than those in forest watersheds. This characteristics is regarded as the effect ofspiked golf shoes beyond the influence of surface geology. The characteristics of rainfallretention in the pastureland, one third of which is occupied by groves yet, is similar tothat in the golf course.(2) The land use coefficient C in the Kadoya-Fukushima's formula for estimating thetime of flood concentration in the golf course is C=120 which is near to the standard value, but the one in the pastureland C=140 to be smaller than the standard value.(3) The maximum values of the peak runoff coefficient are regarded as 0.60-0.65 inboth areas.(4) The values of the parameter k of the kinematic runoff model in both areas arealmost the same, and they correspond nearly to one fourth of the ones in natural mountainwatersheds.