The recent history of hydro-geomorphological processes in the upper Hangbu river system, Anhui Province, China

详细信息    查看全文

• 作者：Xuerong Dai ; J.A. Dearing ; Lizhong Yu ; Weiguo Zhang ; Yuxin Shi ; Furui Zhang ; Chengjun Gu ; J.F. Boyle ; T.J. Coulthard ; G.C. Foster
• 关键词：Dabie Mountains ; Erosion ; Flooding ; Monsoon ; Human impacts ; Climate change
• 刊名：Geomorphology
• 出版年：2009
• 出版时间：15 May 2009
• 年：2009
• 卷：106
• 期：3-4
• 页码：363-375
• 全文大小：4354 K

文摘

This paper describes 20th century climate and human impacts on terrestrial and fluvial systems in the Dabie Mountains, Anhui Province, China, based on analyses of four types of information. Analyses of particle size, mineral magnetism, organic carbon, nitrogen and phosphorus in a sediment core taken from the Longhekou reservoir, built in 1958 AD in the upper reaches of Hangbu River, provide an  45 year record of fluvial responses, while monitored meteorological and hydrological data provide records of climate and river discharge. Census data compiled for the local Shucheng County provide records of population and land use, complemented with analyses of satellite images. The Xiaotian river delivers over 65 % of the total water and silt to the reservoir. Analyses indicate that the fluvial regime tracks the monsoon climate over seasonal timescales, but human activities have a strongly mediating effect on sediment supply, sediment delivery and, to a lesser extent, runoff over longer timescales. Notable periods of human impact on erosion include the Great Leap Forward (1958–1960) and Great Cultural Revolution (1966–1976). A rising trend in precipitation and new land use changes at the present time may be leading to an enhanced flood risk.