Abstract
As casualties are increased due to a landslide recently, it is emphasized that the division of a dangerous area from sediment disaster, specially in an urban area, is getting important. The aim of this study is to redefine how to delineate debris flow-prone area based on the hydrological micro-topography analysis techniques and to enhance the cognitive of residents on that risk in an urban mountainous area. As the results, movable sediment (Vec) is excessively larger than the erosional sediment (Ve), the range of runout distance is in order of using spread angle(L3), set lowest part of the debris flow-prone area(Lh), using stream length(L1), empirical formula(L2). But the maximum distance is in (L1)<(L2)<(Lh)<(L3). Therefore, the value of (L1), (L2) are proper in urban area, it was projected to be more proper that the value of (L 3 ) and (L h ) applicate in bigger watershed and lower development part. The method of hydrological microtopography analysis is likely to contribute to strengthening the activity of social disaster prevention by enabling the self-diagnostic determination of inhabitants on dwelling areas.
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