基于ADCP和OBS观测的洋山港关键断面水沙通量研究  

ADCP-and OBS-based water-sediment flux study on key cross-sections in the Yangshan Harbor

作　　者：英晓明[1] 丁平兴[1] 胡克林[1] 吴辉[1] 

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《泥沙研究》2010年第2期22-30,共9页Journal of Sediment Research

基　　金：国家海洋局公益性项目(200905001-9);国家重点实验室专项经费项目

摘　　要：应用声学多普勒流速剖面仪观测洋山港关键断面剖面水深和流速,同时应用OBS观测断面上代表点处剖面水体浊度,采用通量守恒原理,使用横向均匀、垂向时变的网格,经过时间和空间插值,计算得到大小潮期间洋山港五个主要汊道断面的水沙通量。结果表明,在一个潮周期中,各断面基本上落潮历时大于涨潮历时,但小潮时,断面3落潮历时稍小于涨潮历时。断面5是港区主要的进沙通道,且大潮时该断面净输水输沙方向相反。综合大小潮水沙通量结果,水通量基本守恒,港区内净进沙约5.44万m3/天(2008年8月),以此作为洪季的日平均净输沙量,则洪季港区内净进沙约489.4万m3(三个月),港区内局部表现为淤积。颗珠山汊道洪季净输出沙量约231.3万m3,是重要的出沙通道。In this paper,the instruments of ADCP（Acoustic Doppler Current Profile）and OBS（Optical Backward Scatter）were applied to the five key cross-sections（CS）in the Yangshan Harbor to observe profiles of water depths,flow velocities and SSCs（Suspended Sediment Concentrations）,respectively.Based on the flux conservation principle,the fluxes of water and sediment were calculated by the temporal and spatial interpolation on a horizontal-uniform-and-vertical-varying mesh.The results show that during a tidal cycle,the ebb period is longer than the flood period for almost all cross-sections,except that the ebb period for CS 3 is slightly shorter than the flood period during the neap tide.The main inflow passage for sediment is through CS 5,where the directions for the net water flux and the net sediment flux are reverse.Due to the flux results of waters and sediments during spring tides and neap tides,the total water flux is basically conserved,while the net flux for sediment moving into the harbor area is about 54 400m 3 /day in August,2008.This value can be taken as the daily-averaged net sediment transportation rate for flood seasons,and based upon which,the net inflow sediment for a flood season（three months）is about 489 400m3,and the harbor area is in the state of deposition locally.The Kezhushan inlet is the main outflow passage for sediments,through which about 231 300m 3 of sediments move out of the harbor in a flood season.

关 键 词：洋山港 关键断面 水沙通量 ADCP OBS 

分 类 号：TV148[水利工程—水力学及河流动力学]