摘要
为预测长江中下游河床纵剖面的演变趋势,利用最小能耗率理论计算了该江段的平衡河床纵剖面,研究了这些河段河床演变规律及其未来的变化。分析了长江水库拦沙、河道采砂、近期水沙变化、未来引水及需水量增长等因素。结果表明,长江中下游河床纵剖面还未达到动态平衡,大部分江段以淤积为主。在没有人类活动影响下,达到动态平衡还需要很长一段时间。由于引水和需水量的增长,未来长江中下游达到动态平衡需要淤积更多的泥沙。
Equilibrium longitudinal sedimentation profiles were calculated to study the current fluvial processes and to forecast future changes in the middle and lower reaches of the Yangtze River using the minimum energy dissipation rate theory. Some factors were analysed induding sediment storage in reservoirs, sediment mining, recent changes in runoff and sedimentation load, water diversion, and the water demand growth in the future. All of these affect the fluvial processes. The results show that the middle and lower reaches of the Yangtze River are not in dynamic equilibrium and will not reach equilibrium for a long time. Sedimentation will dominate the river＇s fluvial processes. Water diversion and water demand growth in the future will require more sedimentation to reach dynamic equilibrium in the middle and lower reaches of the Yangtze River.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第12期2131-2134,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家"九七三"重点基础研究项目(2003CB415206)
国家自然科学基金创新群体项目(50221903-3)
关键词
河床演变
平衡纵剖面
长江中下游
最小能耗率
引水
fluvial process
equilibrium longitudinal profile
middle and lower reaches of the Yangtze River
minimum energy dissipation rate
water diversion
