工程科学与技术2018，Vol.50Issue(3)：105-111,7.DOI:10.15961/j.jsuese.201800351
强震受损山前河流河床演变研究
Study on Fluvial Processes of Piedmont Rivers Damaged by Strong Earthquakes
摘要
Abstract
The historical earthquakes in Chuanjiang catchment were one of main dynamic factors which affect the local sediment yield and fluvial processes. The Wenchuan earthquake is the largest earthquake in the recorded history of the Longmenshan fault. Through historical data collection, field study and theoretical analysis, the effects of various natural factors and human activities on the fluvial processes of the piedmont rivers in Longmen Mountains are explored, and the evolution rules of piedmont rivers damaged by strong earthquakes are revealed, and the piedmont river evolution model and its prediction under the changing environment are proposed. The results show that: after the earthquake, different levels of evolutions of piedmont rivers have taken place in the Longmen Moun-tains, especially in the Shiting River, with the maximum downcutting depth of 27.0 m at the 105 Provincial Highway after the flood season of 2015; there are many factors affecting the dramatic evolution of piedmont rivers in Longmen Mountains after the earth-quake and those factors are mixed and interacted with each other. While "water and sediment supply mutation and dissonance slope"are the main internal causes, "engineering barriers and disorder sand mining" are the main external causes. The piedmont river evolu-tion model and its prediction established by the "hydraulic geometry based on the river critical initiation hypothesis" have good ap-plicability and can be used as reference for analyzing the similar strong earthquake-damaged piedmont rivers.关键词
汶川地震/山前河流/演变模式/水沙条件/比降不和谐Key words
Wenchuan earthquake/piedmont rivers/processes pattern/runoff-sediment condition/dissonance slope分类
建筑与水利引用本文复制引用
聂锐华,王小凡,刘发明,王强,范念念,刘兴年..强震受损山前河流河床演变研究[J].工程科学与技术,2018,50(3):105-111,7.基金项目
国家重点研发计划资助项目(2016YFC0402302) （2016YFC0402302）
国家自然科学基金资助项目(51779163 （）
51509172) （）
