黄河口羽状流对调水调沙的响应

Response of the Yellow River plume extent to Water-Sediment Regulation Scheme

本文基于2010年MODIS卫星遥感数据,研究了黄河口海域海表温度(SST)的季节性变化,分析了调水调沙期间黄河口羽状流向海扩展的时空变化,揭示了黄河口羽状流对调水调沙的响应。研究结果表明:海表温度主要受太阳辐射和临近大陆气候的影响,夏季秋季高,春季冬季低,四个季节羽状流扩散范围都较小。调水调沙期间,羽状流向海传输方向发生摆动,由北向逐渐向东偏转至正东方向,最后又转为北向。随着径流量的增加,羽状流扩散范围和传输距离也迅速增大,传输距离与径流量呈较好的对数线性关系。此外,潮汐变化也会影响羽状流的传输方向和输运距离。

Based on the MODIS-derived sea surface temperature(SST) in 2010, the seasonal variation of river plume extent off the Yellow River Mouth was examined, together with the associated response of plume extent to the Water-Sediment Regulation Scheme(WSRS). The results indicated that the SST was mainly affected by the solar radiation and the monsoonal climate. The temperature was high in summer and autumn but low in spring and winter. The direction of plume extension has changed during the period of WSRS, from northward at the beginning of the WSRS to eastward and finally to north(the original direction). The plume extent increased rapidly with the increase of water discharge. A notable logarithm-linear relationship existed between plume extent and water discharge. In addition, the tidal forcing may have also affected the direction and extent of river plume.