FIELD OBSERVATION OF DISCHARGE IN URBAN CATCHMENTS AND EFFECTS OF URBANIZATION ON RUNOFF CHARACTERISTICS

Abstract

In order to clarify the runoff mechanism in urban catchment area, field observation of discharge and application of runoff analysis to the urban catchments are reported in this paper. Land-use in urban area has become more complicated by urbanization during the last several decades. As a result of urbanization, the peak discharge increases and the concentration time of flood decreases. It makes flood disasters in urban area more serious problem. On the other hand, discharge data in urban catchments are very few. In this paper, field observation of discharge are carried out and runoff analysis method for land surface area based on morphological and geological properties is applied several urban catchments to evaluate the effects of urbanization on runoff characteristics in urban area.