摘要
分水岭迁移和河流袭夺是河流演化研究中的一个重要内容.针对柴汶河袭夺河流域进行袭夺前水系的重建与恢复的问题,首先,基于ArcGIS软件对分辨率为30 m的原始DEM数据进行处理,利用均值变点分析法确定柴汶河袭夺河流域的最佳集水面积阈值,提取与实际较为符合的河网水系;然后,基于二次曲线内插法相似原理对被连接分水线所途经的栅格单元重新赋值;最后,以流域地貌特征演化对河流袭夺机理佐以验证.研究结果表明:当集水面积阈值为0.54 km^(2)时,提取的河网水系最接近于实际水系;利用内插法等算法得到的结果可知,通过抬高袭夺处的高程来重建恢复袭夺前水系流域的方法是科学可行的.根据其流域地貌演化可知,古柴汶河上游的河流纵比降大于古沂河上游,对应的下蚀和溯源侵蚀能力强,故易能首先切穿分水岭,袭夺古沂河上游.
River capture and watershed migration are widely concerned in the study of river evolution.In order to reconstruct the water system before the capture of the Chaiwen River Basin,the original DEM data with a resolution of 30 m is processed based on ArcGIS software.Mean value change-point analysis method is used to determine the water catchment area threshold of the river Basin,where the river network water system more in line with the reality is extracted.Then the grid unit connected to the watershed is re-assigned by the interpolation theory.Finally,the evolution of river basin geomorphological characteristics is used to verify the mechanism of river capture.The results show that the extracted river network is closest to the actual water system when the water catchment area threshold is 0.54 km^(2).The results obtained by the interpolation theory show that it is scientific and feasible to reconstruct and restore the watershed of the river system before the capture by the elevation of the capture site.According to the evolution of its drainage basin,it can be seen that the channel slop of the upper reach of the Paleo Chaiwen River is larger than that of the upper reaches of the Paleo Yihe River,inducing a larger down cutting in the ground.Therefore,the Paleo Yihe River firstly cut through the divide and captured the upper reach of the Paleo Yihe River.
作者
朱晓洁
褚忠信
于广科
毛士博
姜瑾斐
朱龙海
ZHU Xiaojie;CHU Zhongxin;YU Guangke;MAO Shibo;JIANG Jinfei;ZHU Longhai(College of Marine Geosciences,Ocean University of China,Qingdao 266100,Shandong;Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Qingdao 266100,Shandong)
出处
《四川师范大学学报（自然科学版）》
CAS
2022年第5期696-703,共8页
Journal of Sichuan Normal University（Natural Science）
基金
国家自然科学基金(41376052)。
关键词
河流袭夺
DEM
集水面积阈值
水系重建
地貌演化
river capture
DEM
water catchment area threshold
water system reconstruction
landform evolution
