摘要
通过对 6 0年代和 90年代珠江三角洲河网典型汊河泥沙分配变化的对比分析 ,认为 (1)珠江河口区的泥沙主要来自陆相径流挟带的下行泥沙和随潮流挟带的上溯泥沙 ,其中径流及其挟带的泥沙是现代珠江三角洲建造过程中的基本动力和物质 ,起着主导作用 ,而珠江河口区由径流挟带的悬移质泥沙又主要来自西江。 (2 )西北江干流部分汊河道的输沙量分配比率基本上保持不变 ,磨刀门仍为各口门中输沙量最大的口门。 (3)珠江河口区的泥沙处于逐年淤积的总趋势 ,其中河流段冲淤变化不大 ,过渡段有冲有淤 ,以淤为主 ,潮流段则是普遍淤积。 (4)海平面上升及人类活动可能导致河道输水输沙的变化 ,应引起重视。
The allocation rate of sediment discharge for typical branching channels in the West and North River Delta was calculated, and the variation features of sediment was analyzed. Some conclusions were obtained: 1) With a small part being transported by tide, the sediment in the estuary of the Pearl River mainly comes from the silt carried by upstream river runoff. The river runoff and the sediment, as the dominant factors, is the basic dynamic and substance for the formation of the modern Pearl River Delta.The West River is the main sediment contributor to the Pearl estuary. 2) As compared with the data in the 1960s, the allocation rate of the sediment discharge for the branching channels of the main West River and North River keeps nearly no change. Modaomen is still the biggest sediment delivery river mouth among the 8 estuaries. 3)The sediment in the estuary of the Pearl River tends to be accumulated year by year. No evident variations have been found for the erosion and deposition in the upstream river stretch. Both erosion and deposition occur in the transitional reaches between the upstream river and the estuary, while deposition occurs all over the estuary. 4) The sea level rise and the activities of human being in the Pearl River Delta may cause unfavorable variations of the transport of sediment and runoff and should be taken seriously.
出处
《热带地理》
北大核心
2000年第1期22-26,共5页
Tropical Geography
基金
交通部"九五"重点科技攻关项目!"珠江三角洲水道水文泥沙同步观测研究"的部分成果。
关键词
珠江三角洲
干流汊道
泥沙
分配
变化
The Pearl River Delta
Branching river
Sediment
Allocation
Variation
