长江口南汇近岸水域悬沙沉降速度估算  

Settling Velocity of Suspended Sediment in the Nanhui Nearshore Waters of Changjiang Estuary

作　　者：陈沈良[1] 谷国传[1] 张国安[1] 

机构地区：[1]华东师范大学河口海岸国家重点实验室,上海200062

出　　处：《泥沙研究》2003年第6期45-51,共7页Journal of Sediment Research

基　　金：国家自然科学基金项目 (4 0 2 760 2 7);教育部科学技术研究重点项目 (0 10 79)

摘　　要：长江口南汇近岸水域 1 994年 9～ 1 0月大、小潮期间悬沙浓度实测资料分析表明 ,涨潮或落潮平均悬沙浓度在垂向上呈指数分布 ,拟合Rouse(1 93 7)公式。据此 ,探索应用Rouse公式计算河口近岸水域悬沙沉速的分步求解法 :先由涨 (落 )潮平均悬沙浓度和相对水深求出公式中的悬浮指标 ,再通过参数的确定从悬浮指标中反推出悬沙沉速。用这一方法近似计算得到南汇近岸水域的悬沙沉速 :涨潮阶段平均为 3 46mm s,落潮阶段平均为 3 0 0mm s;全水域变化在 2 1 4～ 4 3 8mmVertical distributions of average suspended sediment concentration of flood stage or ebb stage in the Nanhui nearshore waters of Changjiang Estuary fit to the Rouse equation: C yC a=hy-1ha-1 ωβκu *. The exponent (i.e. Rouse number) in the equation is a function of the settling velocity of suspended sediment and other parameters. The calculation method of settling velocity was given based on the Rouse number. Firstly, the Rouse number was computed through suspended sediment concentration and relative water depth. Then the settling velocity was calculated through determining other parameters in the Rouse number. The method was applied to the Nanhui nearshore waters. Calculating results indicate that the average settling velocity during flood tide stage is 3.46mm/s and 3.00mm/s during ebb stage; they range from 2.14 to 4.38mm/s in the whole waters.

关 键 词：长江口 悬沙 沉降速度 悬浮指标 R0use公式 

分 类 号：TV142.1[水利工程—水力学及河流动力学]