【作者】 唐造造； 江洧； 侯玉；

【Author】 Tang Zao-zao Jiang Wei Hou Yu (Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610,China; Sun Yat-sen University, Guangzhou 510275,China)

【机构】 广东省水利水电科学研究院； 中山大学；

【摘要】 20世纪80年代以来,东江下游河床严重下切,引发了供水等一系列问题。本文建立了东江下游及三角洲河网非恒定流水沙数学模型,对河床下切的影响因素进行分析研究。研究表明,自然冲淤、三大水库、水土保持和狮子洋航道浚深等因素都不足以导致东江河床严重下切,商业性河道采沙才是造成近年东江河床下切最直接、最根本的原因。更多还原

【Abstract】 Since 1980, the riverbed in the lower reaches of Dongjiang had descended severely, which had brought forth a series of problem in water supply and navigation channel, etc. In this paper, an unsteady flow and sediment mathematical model of the river network of Dongjiang has been established; the factors that may cause the riverbed to descend have been analyzed. The study indicates that natural scouring, the three reservoirs, water and soil conservation and dredging up in Shiziyang channel are not sufficient to make the riverbed of Dongjiang descend severely. The most direct and primary cause for the descending of riverbed in lower Dongjiang is the commercial excavation of sand in Dongjiang.更多还原