人民黄河Issue(1)：18-21,4.DOI:10.3969/j.issn.1000-1379.2014.01.007
黄河调水调沙入海切变锋分析
Preliminary Study on Shear Front off the Yellow River Mouth during the Water and Sediment Regulation
摘要
Abstract
Based on vertical distribution data of current velocity,sediment concentration,salinity and temperature from 29 stations around the Yellow River mouth and the sea area nearby during a regulated discharge regime of the Yellow River,a shear inflection point appeared with the in-tense changing with vertical gradient of each parameter. There was a curved shear front surface formed by joining 29 shear points together. The salty water was distributed beneath the shear front interface and fresh water upwards. The fresh water could not penetrate the shear front downwards so that the vertical distribution of salinity and temperature beneath the front interface was uniform. In opposite,the salty water could penetrate the shear front upwards so that the vertical distribution of salinity and temperature above the front interface was changing with gradient. The sediment distribution on the shear front interface was with the minimum sediment concentration and the current velocities along with directions appeared shear changing between two layers of runoff and tidal current. The location of the shear front began with the bottom of the near-shore mouth bar of the Yellow River and rose along the mainstream and both sides gradually until reaching to the sea level. Fresh water off the Yellow River mouth with 2. 2% salinity mostly distributed in the shallow layer when the discharge was 3,000 m3/s. The sediment flocculated and deposited quickly from far area to nearby region and also from coarse grains to fine sediment so that the sediment concentration in the surface area which exceeded the 2. 2%salinity range was less than 10 mg/L. With the distance of 7. 9 km to the river outlet,there was the famous boundary of blue sea water and yellow muddy runoff. The sediment from medium and lower layer could be transported to the area which was about 13 km beyond the river outlet and 6. 35 km from both sides.关键词
调水调沙/入海切变锋/黄河河口Key words
water and sediment regulation/shear front off the Yellow River mouth/Yellow River estuary分类
天文与地球科学引用本文复制引用
徐丛亮,李金萍,谷硕,童林龙,范骏..黄河调水调沙入海切变锋分析[J].人民黄河,2014,(1):18-21,4.基金项目
国家海洋公益科研专项（201105005）。 （）
