NUMERICAL SIMULATION OF SALINITY DISTRIBUTIONS IN THE YATSUSHIRO SEA BY POM COMBINED WITH WATERSHED MODEL FOR B-CLASS RIVER BASIN
NUMERICAL SIMULATION OF SALINITY DISTRIBUTIONS IN THE YATSUSHIRO SEA BY POM COMBINED WITH WATERSHED MODEL FOR B-CLASS RIVER BASIN
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发表时间：
2012
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通讯作者：
S. Lou;A. Tada;Akira Tai;S. Yano;Seiji Suzuki;Shu-guang Liu
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作者：
S. Lou;A. Tada;Akira Tai;S. Yano;Seiji Suzuki;Shu-guang Liu
水俣湾位于八代海的东南沿海地区，自1932年以来，由于一家化学工厂排放有机汞化合物，水俣湾受到严重污染。一些研究表明，海水特性与甲基汞浓度之间存在相关性。本文在分析八代海低盐度水团的基础上，利用普林斯顿海洋模式（POM）结合流域模式，研究了在河流淡水影响下的八代海盐度场。首先建立了涵盖八代海和有香海的POM。在六种情况下的盐度场计算淡水流入从A级河流：熊河。然后将流域模型应用于B级河流的流域：Komenotsu河的Case 5和Case 6。利用降雨资料和流域物理特性，采用运动波法（KWM）估算河流流量。计算表明，在大多数情况下，模拟的近地层盐度与实测的近地层盐度变化趋势一致。在大多数地区，情况1-情况4的偏差小于20%，但在情况5和情况6中，当实测盐度小于5时，偏差明显增大，且最大偏差总是出现在表层。将Komenotsu河的排放量添加到POM中，由于降雨和靠近河口的位置，Case 5中的两个站（St.25和St.26）和Case 6中的一个站（St.26）的盐度有所下降。
Minamata Bay, located in the southeast coastal areas of the Yatsushiro Sea, was heavily polluted due to the discharge of organic mercury compound from a chemical factory since 1932. Some research has demonstrated that correlations between seawater characteristics and methyl-mercury concentration are observed. Based on the analysis of low-salinity water masses in the Yatsushiro Sea, this paper deals with salinity field in the Yatsushiro Sea under the effect of freshwater from rivers by Princeton Ocean Model (POM) combined with watershed model. Firstly POM is established covering both the Yatsushiro Sea and the Ariaka Sea. Salinity fields in six cases are calculated under freshwater inflow from a A-Class river: the Kuma River. Then a watershed model is applied in basin of a B-Class river: the Komenotsu River for Case5 and Case6. Rainfall data and physical characteristics of catchment are utilized to estimate river's discharge by Kinematic Wave Method (KWM). Through the computation, it's indicated that simulated salinities in surface layer exhibit the same trends as the measured ones at most cases. The deviations in Case1-Case4 are less than 20% at most areas, but the deviations become obviously higher in Case5 and Case6 when the measured salinities are lower than 5 and the highest deviations always occur in surface layer. Adding the Komenotsu River's discharges into POM, salinities at two stations (St.25 and St.26) in Case5 and one station (St.26) in Case6 have decreased owing to the rainfall and closer location to the river mouth.