非恒定流推移质运动研究进展分析

Recent advances in studying river bedload transport under unsteady flows

非恒定流推移质输沙是河流动力学研究中的基础性问题之一。近几十年来,国内外许多学者对这一问题开展了探索性研究,取得了不少研究成果。本文简要回顾了非恒定流推移质运动的研究历程,并从4个方面总结了非恒定流推移质输沙研究进展和主要成果:(1)水沙运动的滞后性;(2)泥沙运动的绳套变化特征;(3)推移质输沙率;(4)洪水驱动下的推移质输沙量。基于对已有研究结果的归纳与分析,指出了现阶段研究中存在的不足,并提出了非恒定流推移质运动的研究建议。

Bedload sediment transport in unsteady flows is a fundamental research topic in river dynamics.Over the last few decades,a number of researchers at home and abroad have conducted a series of exploratory studies,achieved insightful understanding,and made great contributions to this subject.This paper reviews the recent advances in the knowledge of bedload sediment transport under unsteady flows,in terms of(i)hysteresis,(ii)hysteretic loops of hydraulic and sediment parameters,(iii)bedload sediment transport rate,and(iv)total bedload yield.Based on an analysis of previous works and findings,we highlight related issues with relevant studies,and make suggestions for addressing these issues.