滇西澜沧江流域面积-高程积分及其地貌意义  

The Area-elevation Integration and Its Geomorphological Significance in the Lancang River Basin,Western Yunnan

作　　者：李圣 徐雨帆 卿元华 高骏 LI Sheng;XU Yufan;QING Yuanhua;GAO Jun(Yunnan Earthquake Agency,Yunnan Kunming 650224,China;China School History Geography and Tourism,Chengdu Normal University,Sichuan Chengdu 611130,China;Water Resources Bureau of the Honghe Hani and Yi Autonomous Prefecture,Yunnan Mengzi 661100,China)

机构地区：[1]云南省地震局,云南昆明650224 [2]成都师范学院史地与旅游学院,四川成都611130 [3]红河哈尼族彝族自治州水利局,云南蒙自661100

出　　处：《四川地震》2025年第1期36-41,共6页Earthquake Research in Sichuan

基　　金：四川省区域和国别重点研究基地东南亚经济与文化研究中心2023年度项目(DNY2304);云南省地震科技创新团队(CXTD202408)。

摘　　要：云南澜沧江流域位于青藏高原东南缘地区,区内地质构造复杂,高山峡谷地貌发育,水系发达。为了探究该流域的地貌演化阶段,分析区内地貌的影响因素,确定构造与地貌的响应关系,基于30m分辨率的ASTER GDEM数据,利用ArcGIS平台提取澜沧江流域范围和5级水系,获得216个子流域的面积-高程积分(HI)值,并综合地质构造、降雨和岩性的特征进行分析。研究结果表明,澜沧江流域的HI值为0.14~0.66,空间分布上呈现出北高南低、西高东低的特征;地貌发育处于老年期(0.14≤HI<0.35)的子流域盆地有32个,处于壮年期(0.35≤HI≤0.60)的有180个,处于幼年期(0.60<HI≤0.66)的有4个,区域地貌演化整体处于壮年期。HI受地层岩性的影响较小,受降雨影响适中,主要受构造活动控制。在断裂分布区域,HI主要为高值,而龙蟠—乔后断裂区域HI呈低值,可能与该断裂中更新世以来构造强度弱——垂直滑动速率低有关。The Lancang River Valley in Yunnan province is characterized by complex geological structures and well-developed mountain and Canyon landforms,which is located in the southeastern margin of the Qinghai-Tibet Plat-eau.To determine the geomorphologic evolution stages of the Lancang River Basin and analyze the geomorphologic influencing factors in the region,we used ArcGIS technology based on 30 m resolution ASTER GDEM data to ex-tract the geomorphologic evolution stages of the river basin and the 5 th-grade river system.We also obtained and discussed hypso-metric Integral(HI)of 216 sub-basins on the geological structure,rainfall and lithology.The re-sults revealed that the HI values in the Lancang River Basin ranged from 0.14 to 0.66,showing the characteristics of higher values in the north and west,and lower in the south and east.The mean value of HI is 0.44,indicating that the overall geomorphic evolution is in its prime period.The area-elevation integral is slightly affected by the li-thology of the strata,moderately by rainfall,and mainly controlled by tectonic activity.The HI value in the study area could well reflect tectonic activity.In fault distribution area,the main HI values are high whereas the HI val-ues in the Longpan-Qiaohou fault area are low,which might be related to the weak vertical slip rate and structural strength of the fault since the Middle Pleistocene.

关 键 词：面积-高程积分 澜沧江流域 澜沧江断裂 维西—乔后断裂 

分 类 号：P315.72[天文地球—地震学]