辽河口区径流对污染物漂移扩散的影响
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摘要
基于MIKE3三维数值模型,本文将水动力模块与水质模块耦合,模拟了辽东湾海域无机氮DIN的浓度分布,并探讨了辽河径流变化对无机氮浓度分布的影响。模拟结果表明:辽东湾无机氮DIN经历了秋、冬季积累,春、夏季消耗的过程,浓度从东北至西南方向呈递减趋势,东北区域辽河口和大辽河口处为无机氮高浓度区;在河流输入无机氮浓度不变的情况下,辽河强水动力条件会使整个湾内污染物浓度增加,加剧水体污染,弱水动力条件在一定程度上可以改善海域水质状况。
Based on the three-dimensional numerical model,this article simulates the distribution of the DIN concentration in Liaodong bay and investigates the influence of the variation of Liao river discharge on the distribution of DIN concentration,by coupling the hydrodynamic module and the water quality module of the model. The simulation results show that the DIN is accumulated during autumn and winter while consumed during spring and summer and the concentration of DIN gradually declines from the northeast to the southwest. In the northwest of Liaodong bay,high concentration of DIN exits in the Liao River estuary and the Daliao river estuary. With the concentration of the DIN input from the river remaining the same,strong hydrodynamic condition of Liao river will increase the concentration of DIN in the whole Liaodong bay,causing more serious water pollution. A weak hydrodynamic condition will improve the water quality of the sea area to some extent.
Based on the three-dimensional numerical model,this article simulates the distribution of the DIN concentration in Liaodong bay and investigates the influence of the variation of Liao river discharge on the distribution of DIN concentration,by coupling the hydrodynamic module and the water quality module of the model. The simulation results show that the DIN is accumulated during autumn and winter while consumed during spring and summer and the concentration of DIN gradually declines from the northeast to the southwest. In the northwest of Liaodong bay,high concentration of DIN exits in the Liao River estuary and the Daliao river estuary. With the concentration of the DIN input from the river remaining the same,strong hydrodynamic condition of Liao river will increase the concentration of DIN in the whole Liaodong bay,causing more serious water pollution. A weak hydrodynamic condition will improve the water quality of the sea area to some extent.
引文
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[3]WANG J,YE S Y,LAWS E A,et al. Surface sediment propertiesand heavy metal pollution assessment in the shallow sea wetlandof the Liaodong bay,China[J]. Marine Pollution Bulletin,2017,120(1/2):347-354.
[4]张学庆,孙英兰,蔡惠文,等.胶州湾COD、N、P污染物浓度数值模拟[J].海洋环境科学,2005,24(3):64-67.
[5]LIU R,ZHANG X Q,LIANG B C,et al. Numerical Study on theInfluences of hydrodynamic factors on water age in the Liao riverestuary,China[J]. Journal of Coastal Research,2017:98-107.
[6]顾杰,钱从锐,梁慧迪,等.曹妃甸海域化学需氧量(COD)的季节性分布特征[J].海洋环境科学,2017,36(4):578-583.
[7]王昆,王年斌,孙家文,等.基于辽东湾海域的非保守型水质预测预报模型研究[J].水动力学研究与进展A辑,2013,28(6):691-700.
[8]李明昌.潮汐及生态模型优化反演方法研究[D].大连:大连理工大学,2008.
[9]李曰嵩,潘灵芝,杨红.长江口海域污染物入海扩散模拟研究[J].海洋湖沼通报,2014(2):9-14.
[10]DHI Water&Environment. MIKE21&MIKE 3 Flow Model FMHydrodynamic and Transport Module Scientific Documentation[M]. Hrsholm,Denmark:DHI Water&Environment,2014.
[11]WANG Q,GUO X Y,TAKEOKA H. Seasonal variations of theYellow River plume in the Bohai sea:a model study[J]. Journalof Geophysical Research Oceans,2008,113(C8):2092-2112.
[12]海洋图集编委会.渤海,黄海,东海海洋图集(化学)[M].北京:海洋出版社,1991.
[13]LIU H,YIN B S. Model study on Bohai ecosystem 1. Model de-scription and primary productivity[J]. Acta Oceanologica Sini-ca,2006,25(4):77-90.
[14]国家海洋局. 2009年中国海洋环境质量公报[R].北京:国家海洋局,2010.
[15]夏斌. 2005年夏季环渤海16条主要河流的污染状况及入海通量[D].青岛:中国海洋大学,2007.
[16]袁本坤,黄蕊,商杰,等.基于岸基观测数据的渤海沿岸海域表层温盐特征分析[J].海洋开发与管理,2015,32(12):31-34.
[17]宋文鹏.渤海冬、夏季温盐场结构及海流特征分析[D].青岛:中国海洋大学,2009.
[18]曹丽格.辽河流域气候变化对其径流量的影响研究[D].北京:中国气象科学研究院,2013.