Simulation On The Transportation Of Pollutant COD During The Storm Surges In Bohai Sea

The issue of the transportation of pollutant COD is important when discussing the self-purification capability and the environmental evaluation. This paper mainly focuses on the transportation of COD during the storm surges in Bohai Sea. The process of the transportation of COD is added into the Princeton Ocean Model. Based on the satisfactory respective simulation of the tide and the storm surges, the variation of the amount and distribution of COD in Bohai Sea are simulated, and the two results are compared and discussed. The conclusions are as follows: (1) After being affected by tide for 30 days, the amount of COD decreases by 0.21% and its distribution varied greatly, even 20%. (2)After the typhoon No.7203, the amount of COD decreases 0.3339%; the local variation of its distribution reaches 20% in some area. (3) The simulation of 21 cold wave processes shows a mean decrease of 0.7446% of the amount of COD. Among them, the cold wave No.790225 decreases most (1.3439%), while the No.880312 decreases least (0.2205%). The local variations of distribution of COD after the two courses both have a great variation with the maximum of 20%. (4) The average decrease of the amount of COD per year due to storm surges is 3-4 times as that due to tide. The local variation of distribution of COD in some area due to the storm surges is as large as that due to tide of 30 days. (5) The mean decrement of the amount of COD per year due to storm surges is 3-4 times as that due to tide. The regulation by storm surges is as strong as that by tide of 30 days.