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首页> 外文期刊>Hydrology and Earth System Sciences >Rapid channel incision of the lower Pearl River (China) since the 1990s as a consequence of sediment depletion
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Rapid channel incision of the lower Pearl River (China) since the 1990s as a consequence of sediment depletion

机译：1990年代以来由于沉积物枯竭，珠江下游（中国）快速切开河道

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This paper reported a dramatic channel incision (>10 m in the deepest cut)during the past 10 y or so in the lower Pearl River, the second largestriver in terms of water discharge in China. The channel incision had causedchanges both in the channel geometry as well as in the river hydraulics.Also, the water exchange between the two major tributaries of the PearlRiver, the Xijiang and Beijiang, had been significantly changed due to thechannel incision. The rapid channel incision was principally the result ofextensive sand mining in the lower Pearl River and the delta region due tothe booming economy in the Pearl Delta region. Slight increase of waterdischarge and significant decrease of sediment load since the early 1990s inboth the Xijiang and Beijiang also likely contributed to the observeddramatic river bed downcutting to some extent. This has importantimplications for river management, as the large Chinese rivers have seen adramatic depletion of sediment fluxes due to the combined effects ofdeclining rainfall, dam constructions, water diversion, reforestation andafforestation, and sediment mining over the recent decades.
机译：这篇论文报道了过去10年左右的珠江下游河道切口（最深处> 10 m），这是中国第二大河流。河道切口不仅改变了河道的几何形状，而且还改变了河水力学。此外，由于河道切口，珠江两大支流西江和北江之间的水交换也发生了显着变化。快速通道切割主要是由于珠江三角洲地区经济蓬勃发展而在珠江下游和三角洲地区大量采砂的结果。自1990年代初以来，西江和北江的排水量略有增加，泥沙负荷显着减少，也可能在一定程度上导致了观测到的剧烈河床减少。这对河流管理具有重要意义，因为近几十年来，由于降雨减少，水坝建设，引水，造林和造林以及沉积物开采的综合作用，中国的大型河流的沉积物通量急剧减少。

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