深圳市西乡河口水环境治理的水动力控导研究

Research on Hydrodynamic Control and Guide of Xixianghe River Mouth Water Environment Improvement in Shenzhen

西乡河在大铲湾突堤码头建设前,河口直面伶仃洋,较强的潮汐动力可使河口附近河段保持水质相对清洁。大铲湾突堤码头的建设,使原来开敞的海湾变成半封闭的港池,西乡河口位于湾内最深处,与外海水体交换能力急剧减弱。由于河口水动力条件发生较大变化,上游污水得不到充分稀释,并在河口及大铲湾港池内蓄积,严重影响当地水环境,这种状况随时间的延长而不断加重。对西乡河口的水质问题制定多种水动力控导方案,并进行相关研究。

Before the construction of Dachanwan Jetty Wharf, the mouth of Xixianghe River faced the Lingdingyang Bay directly. The strong tidal dynamic power facilitated the water environment to keep clean around the mouth area. The construction of the Dachanwan Jetty Wharf enclosed the open bay into a semi-closed one. Xixianghe River mouth is located at the furthest part of the wharf and the water exchange with the open sea was largely reduced. The dramatic hydrodynamic variation tampered with the full dilution of the polluted water from upstream and the pollutants were accumulated within the mouth area as well as the harbor basin, worsening the water environment. This situation was aggravated day by day. The various hydrodynamic control and guide schemes are figured out to improve the water quality of Xixianghe River.