| 摘要: |
| 根据1989年5月和8月枯、洪水两个季节黄河拦门沙区及河口海区地质和水文调查资料，结合黄河利津水文站近几年的径流量和输沙量变化，对黄河清水沟流路稳定性及其影响因素进行综合分析研究。结果表明，近年来黄河来沙量渐少是清水沟流路稳定的重要因素之一；随着河口向南转向海动力作用较弱的莱州湾，海水沿河上溯力逐渐减弱，河流泥沙得以更顺利地入海，并在口门外沉积；现流路河口海域的水动力作用虽然较弱，但涨、落潮流的分布格局非常有利于泥沙的向外输送，这对减轻河道内和河口区的淤积强度、稳定和延长流路寿命极为有利。 |
| 关键词: 清水沟流路 稳定性 黄河泥沙 |
| DOI： |
| 分类号: |
| 基金项目:国家八五攻关资助项目，859260203号;南京大学海岸与海岛国家试点实验室资助，SCIEL21195145号 |
附件 |
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| ANALYSIS ON THE STABILITY OF THE QINGSHUIGOU COURSE OF THE HUANGHE RIVER |
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Li Ping1, Wang Tao2, Gao Wenyong3
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1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071;2.Jinan Hydrometric Station, huanghe River Hydrology Commission, Jinan 250101;3.State Pilot Laboratory of Coaxst & Island Exploitation, Nanjing University, Nanjing 210093
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| Abstract: |
| The extremely large amount of sediment discharge from the Huanghe River results in a rapid deltaic progradation and frequent shifting of the river mouth. Usually, an average course period of the Huanghe River mouth channel is 12 years. The present Qingshuigou course lasted 19 years from 1976 to 1995, and was still in its better condition. In order to understand the mechanics of the Qingshuigou course stability and the impact factors, two cruises of investigation were carried out in the Huanghe River estuary during May and August 1989. The data of bottom sediment components by methods of grain size and mineral assemblage analysis, suspended sediment concentrations, and temperature and salinity of sea water were collected at 48 sampling stations. In particular, sedimentation rates at 5 stations were determined by 210Pb dating of shallow cores, and twenty-five hour series data were collected at each of 4 selected stations in the immediate vicinity of the estuary or in the Laizhou Bay. Landsat TM images were used to interpret the suspended sediment concentration distribution and transport trend in the estuary area. Synchronously hydrological and suspended sediment data were taken at 8 sections in the river mouth bar area. The variation of water and sediment discharges at the Huanghe River Lijin Hydrometric Station was also considered. This paper is a comprehensive study on the Qingshuigou course stability and the related factors. The study showed that, l) decreasing sediment discharge from the Huanghe River was one of the important factors which influenced the course stability. 2) With the river outlet gradually turning southward to Laizhou Bay with very weak hydrodynamics, the effect of tide upward to the river gets decreased. This facilitated seaward transport of sediments from the Huanghe River and their deposition in estuary area. 3)Though the tidal range and current velocity were small in the area of the present river mouth. The flood and ebb tidal current pattern favors the transport of the Huanghe River sediments to the outside of the subaqueous delta. These factors reduce greatly the siltation in the river mouth bar and estuary area, and keep the river's Qingshuigou course stable for a longer time. |
| Key words: Qingshuigou course, Stability, Huanghe River sediment discharge |
