山区复杂大流域地貌发育阶段判识方法及应用

为确定山区复杂大流域的地貌发育阶段及其在地震、暴雨等触发条件下的灾害区域严重程度.基于地貌循环理论和山区复杂大型流域的分阶段发育的理论，将斯特拉勒积分的计算方法与坡降指标（SL指标）结合，以确定山区复杂大流域的发育阶段.利用DEM（digital elevation model）和ArcGIS技术，计算发育阶段并据此评价崩塌滑坡在触发条件具备时的区域严重程度.在山区复河流复杂大流域内，分支小流域的斯特拉勒积分的变化点，SL指标的突变点均可以作为发育阶段的分界点；在同一发育阶段内，斯特拉勒积分值分布集中，整个发育阶段的斯特拉勒积分可以作为处于这一发育阶段的所有分支小流域发育阶段的代表值.处于幼年晚期和壮年期的流域，斯特拉勒积分处于0.45~0.6之间，崩塌滑坡最严重.
A method of determining the stage of geomorphic development is built up in complicated mountainous river basin, which can also be used to regional assessment of the regional severity of collapse-landslide caused by earthquake or heavy rainstorm. Based on the theory of the erosion cycle and the theory of river's developing by stages, the stage of geomorphic development is estimated by combining the Strahler's integral (HI) and the stream-gradient indices (SL indices). Then regional severity of collapse-landslide is estimated by development stage with DEM (digital elevation model) and ArcGIS technique. Both of the change point of HI of branch basins and the breakpoint of SL indices can be the cut-off point of development stage. In the same development stage, HIs are very similar. HI of the whole same development stage can be the representative HI of all the HIs of branch basins. The basins in development stage of late youth and maturity have the severest regional disasters, with HI change from 0.45~0.6.