摘要
以浙江省磐安县为研究区,基于ArcGIS10.2平台和DEM高程数据,提取了研究区次级小流域,并计算了每个流域的HI值.结果显示,研究区丘陵型集水盆地的平均HI值为0.5206,平原型集水盆地的平均HI值为0.3364.除了⑥号夹溪流域外,研究区其他9条流域的河流主干道中下游的HI值均较低,多小于0.35.⑥号夹溪流域上游的尚湖镇—万苍乡一带的HI值相对较小,下游尖山镇附近的HI值则相对较高,这与该流域的玄武岩台地隆升密切相关.同时,提取了研究区各流域主河道河流纵剖面,并进行了数学函数拟合,结果显示研究区各流域主河道河流纵剖面的拟合函数为对数函数和线性函数两种类型.各流域面积-高程积分曲线、HI值与各流域主河道河流纵剖面拟合函数具有高度对应性.此外,对研究区已发生的地质灾害进行了投点对比,发现地质灾害发生较多的流域的HI值并不高,一般在0.3附近,地质灾害发生较少的流域的HI值反而较大,集中在0.4~0.6之间,反映了在当前时间尺度下,地质灾害是地貌演化物质卸载的主要形式.
Taking Pan’an County of Zhejiang Province as the study area,based on the ArcGIS10.2 platform and DEM elevation data,secondary small catchments in the study area are extracted and the HI values of each catchment are calculated.The results show that the average HI values of hilly catchment basin and plain catchment basin in the study area are 0.5206 and 0.3364 respectively.In addition to the No.6 Jiaxi Basin,the HI values of the middle and lower reaches of the main river trunk in the other 9 basins in the study area are all low,mostly less than 0.35.The HI value of Shanghu Town-Wancang Township in the upper reaches of No.6 Jiaxi Basin is relatively small,while the HI value of Jianshan Town in the lower reaches is relatively high,which is closely related to the basalt platform uplift in the basin.At the same time,the longitudinal profiles of the main channels in each basin of the study area is extracted and the mathematical functions are fitted.The results show that the fitting functions of the longitudinal profiles of the main channels in each basin of the study area are logarithmic function and linear function.The area-elevation integral curve and HI value of each watershed are highly corresponding to the fitting function of the longitudinal profile of the main river in each basin.In addition,by comparing the geological disasters that have occurred in the study area,it is found that the HI values of the basins with more geological disasters are not high,generally around 0.3,while the HI values of the basins with fewer geological disasters are relatively large,concentrated between 0.4 and 0.6,reflecting that the geological disasters are the main form of material unloading of geomorphic evolution under the current time scale.
作者
冯雁飞
李敬波
曹岚宇
刘炎良
FENG Yanfei;LI Jingbo;CAO Lanyu;LIU Yanliang(The 3rd Geological Brigade of Zhejiang Province,Jinhua 321000,Zhejiang China;China University of Geosciences(Wuhan),Wuhan 430000,China)
出处
《河南科学》
2023年第5期687-696,共10页
Henan Science
基金
金华市地质灾害风险普查综合研究项目(JHHX2021-FW11249-ZFCG101)。
关键词
地貌
DAVIS
面积-高程积分
河流纵剖面
地质灾害
landform
Davis
area-elevation integral
river longitudinal profile
geological disaster
