[1]LI Sheng,CHANG Yuqiao,QING Yuanhua,et al.Geomorphologic Features of the Longchuan River Basin in Central Yunnan and Their Indication of Tectonic Activity[J].Journal of Seismological Research,2025,(03):391-400.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0041
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Geomorphologic Features of the Longchuan River Basin in Central Yunnan and Their Indication of Tectonic Activity
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
Number of periods:
2025 03
Page number:
391-400
Column:
Public date:
2025-04-15
- Title:
- Geomorphologic Features of the Longchuan River Basin in Central Yunnan and Their Indication of Tectonic Activity
- Keywords:
- the Longchuan River Basin; hypso-metric integral; strip profile; tectonic activity; geomorphological evolution
- CLC:
- P315.24
- DOI:
- 10.20015/j.cnki.ISSN1000-0666.2025.0041
- Abstract:
- Based on the 30-meter resolution ASTERDEM data,the hydrological analysis tool of ArcGIS software was used to extract the water system and sub-basins of the Longchuan River Basin,to obtain the basin elevations,strip profiles,69 sub-basin undulations,hypso-metric integral values(HI),and 26 hypso-metric integral curves(HC),and to synthesize the stratigraphy,rainfall,and geologic structure.The results show that:①The upper and middle reaches of the Longchuan River Basin have medium level of undulation; the lower reaches have high and very high level of undulation; the river valley is characterized by low level of undulation.②In the Longchuan River Basin,the strip topography and the undulation profile has synchronous segmentation from southwest to northeast,the Basin can be subdivided into hills,middle-low mountains,middle-high mountains,and high mountains.③HI values in the Longchuan River Basin range between 0.18 and 0.60,with a mean of 0.38,and the whole Basin is in geologically its mature stage.The HC curve in the upper reaches is mainly concave,so as in the lower reaches; the HC curve in the middle reaches is mainly S-shaped.④According to HI values from the largest to the smallest in the River Bain,low-intermediate metamorphic rock's resistance to erosion is approximately equal to sedimentary rock's resistance to erosion,and stronger than the Quaternary sediments' resistance to erosion.Lithology and precipitation have less influence on HI values and the undulation degree in the Basin.⑤Tectonic activity is the main controlling factor of geomorphic evolution in the Longchuan River Basin.HI values in the fracture-clamping zone is larger than HI values in the fracture zone,and HI values in the fracture zone is larger than the ones in the non-fracture zone.⑥The HI index indicates that the Chuxiong Basin and the Yuanmou Basin have evolved to the erosion-sedimentation stage.The intensity of the Shiyangzhen-Daguyan Fault activity has different effect on the hanging wall and the footwall.The Yuanmou-Luzhijiang Fault acted intensively from north to south,and the uplift in the clamped zone is the highest in overall.
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Last Update:
2025-04-15