2001—2011年黄河入海泥沙分布及其扩散机制

Distribution and Diffusion Mechanism of Sea Sediment of the Yellow River During the Period of 2001 to 2011

通过对2001年6月、2011年6月黄河口及邻近海域进行水下地形测验,分析了调水调沙10a间入海泥沙的分布及扩散情况。结果表明:黄河泥沙入海后,首先遭遇到入海上层径流与底层海流作用形成的切变锋的第一道拦阻,使66%的入海泥沙淤积在110km2的口门区,然后河口10m水深处潮汐相位差切变锋的第二道拦阻,又导致83%的入海泥沙被阻隔在面积245km2的12m水深节点线以内近岸区域,这两道切变锋对泥沙的连续、强烈"捕捉"是黄河口拦门沙形成的最主要机制。

Based on the Yellow River estuary and adjacent waters underwater topography test in June 2001 and June 2011,this paper analyzed the distribution and diffusion of sea sediment during the ten years of water-sediment regulation. The results show that after the Yellow River sediment going into the sea,the shear front that formed by upper runoff and bottom current as the first block retains 66% of the sea sediment deposited in the entrance area of the 110 km2 . Then the shear front of tidal phase difference at the deep of 10 m of estuary as the second block retains 83% of the sea sediment are blocked in the area of 245 km2 within 12 m water depth of inshore area. The continuous strong capture of two shear fronts is the main mechanism of the formation of mouth bar in the Yellow River estuary.