摘要
疏勒河上游位于中祁连地块，受到中祁连南缘断裂带、中祁连北缘断裂带的差异控制，其地貌是青藏高原隆升的结果。本文以疏勒河上游为研究对象，应用ArcGIS水文分析工具，提取河流纵剖面、Hack剖面、sL参数以及Hl，分析了河流的形态特征；提取流域边界高程剖面，分析了流域演化遗留的地貌证据。研究结果表明，疏勒河上游河流纵剖面以线性函数为最佳拟合函数，说明疏勒河上游河段整体上处于河流发育早期阶段；Hack剖面呈明显的凸形，说明第四纪以来流域所在地区处于强烈的构造抬升；河流流向转折、SL异常值以及河流纵剖面裂点具有良好的一致性，从流域边界剖面识别的垭口又与上述三者具有对应关系。综合上述河流特征及流域边界剖面所反映的信息，推测研究区发生过3次袭夺事件。古疏勒河、古昌马河以及古野马河的重组塑造了现在的疏勒河流域。
Shule River originates from the western part of the Qilianshan Mountain, between Shulenanshan Mountain and Tuolainanshan Mountain. The upper Shule River is located in the Middle Qilian block, differentially controlled by the Northern＇Middle Qilian Fault Zone and the Southern Middle Qilian Fault Zone. Its landform is the result of the uplift of the Qinghai-Tibetan Plateau. Altyn Tagh Fault, Hanxia-Dahuanggou Fault, Changma Fault, Northern Daxueshan Fault, Tuolainanshan Fault and Shulenanshan Fault are mainly active faults. In the study area, Cenozoic strata spreads in Shule River basin, Changma basin and both sides of the river. Proterozoic strata and Paleozoic strata spread in the middle part of the upper Shule River and mountains surrounding Changma basin. In this study, the ASTER GDEM V002, spatial resolution of 30m, was utilized as basic data, and the hydrology tools were applied in ArcGIS to extract the river profile, Hack profile, SL index, and HI from the upstream basin of the Shule River to analyze fluvial geomorphology, and extract watershed boundary elevation profile to analyze geomorphic evidence left from the basin evolution. There are three obvious fluvial elbows. In each bend of the river, there was a knickpoint and abnormally SL value. SL presents per lO0km sectional characteristics. There are abnormal high values or abnormal low value in each section. The river segments with abnormally high SL values, mainly represented faults activity of study area. The obviously highest SL values appear in Tuolainanshan Fault. The linear function was the best fit-function for the river longitudinal profile of the upper Shule River, which indicated that the evolution process of the upper river was in an early stage. The morphology of Hack profiles was convex, which showed that the main factor causing the landform was tectonic uplifting in the upper Shule River. The HI of the Shule River upstream watershed was 0.49. From its river source to 80km afar, the HI was 0.23, which indicated that the stages of river de
出处
《第四纪研究》
CAS
CSCD
北大核心
2015年第2期465-474,共10页
Quaternary Sciences
基金
高等学校博士学科点专项科研基金项目（批准号：20125122110010）、国家自然科学基金项目（批准号：41002055）和中国地质调查局项目（批准号：12120113033004）共同资助
关键词
疏勒河上游
河流纵剖面
Hack剖面
SL参数
袭夺
野马河
流域边界高程剖面
the upper Shule River, river longitudinal profile, Hack profile, SL index, river capture,Yema River, watershed boundary elevation profile
