三峡水库运行以来入海径流与盐水入侵响应研究
发布时间：2018-08-29 11:53
【摘要】：为研究三峡水库运行以来盐水入侵对长江河口的影响,采用自行编译完成的Delft3D 4.01.01版本源代码,建立了大通到长江口外的二维水流盐度数学模型,综合分析入海径流量与盐水入侵的响应机制。研究表明Ddlft3D 4.01.01源代码能很好地模拟计算长江口水动力盐度分布,验证误差仅有10%~15%。从计算结果可以看出,盐水入侵情况与径流量关系明显,当大通站径流量为5 000 m~3/s时,长江口南支与北支均发生盐水入侵。随着径流量增大,淡水区域面积由南支右岸向下游进一步扩大。当径流量超过30 000 m~3/s时,南支基本不存在盐水入侵情况,可以保证水库正常取水安全。当存在风力作用时,盐水入侵明显,盐水浓度达到3.5 ppt以上,而无风情况下,盐水入侵趋势减弱,长江口南支河段区域的盐度一般满足灌溉水的标准(2.2‰)。
[Abstract]:In order to study the influence of saltwater intrusion on the Yangtze River estuary since the three Gorges Reservoir came into operation, a two-dimensional mathematical model of the salinity of water flow from Datong to the Changjiang Estuary was established by using the self-compiled source code of Delft3D version 4.01.01. The response mechanism of runoff into the sea and salt water intrusion is analyzed synthetically. The results show that the source code of Ddlft3D 4.01.01 can well simulate and calculate the distribution of hydrodynamic salinity in the Changjiang Estuary, and the verification error is only 10 / 15. From the calculation results, it can be seen that the salt water intrusion is obviously related to the runoff. When the runoff of Datong station is 5 000 mm3 / s, both the south branch and the north branch of the Changjiang Estuary have saline intrusion. With the increase of runoff, the area of fresh water is further expanded from the right bank of the southern branch to the downstream. When the runoff exceeds 30 000 mm3 / s, there is no salt water intrusion in the southern branch, which can ensure the normal water intake safety of the reservoir. When there is wind force, the salt water intrusion is obvious, the salt water concentration is over 3.5 ppt, but the saltwater intrusion trend is weakened under the condition of no wind, the salinity of the south branch reach of the Yangtze River Estuary generally meets the irrigation water standard (2.2 鈥，
本文编号：2211119
[Abstract]:In order to study the influence of saltwater intrusion on the Yangtze River estuary since the three Gorges Reservoir came into operation, a two-dimensional mathematical model of the salinity of water flow from Datong to the Changjiang Estuary was established by using the self-compiled source code of Delft3D version 4.01.01. The response mechanism of runoff into the sea and salt water intrusion is analyzed synthetically. The results show that the source code of Ddlft3D 4.01.01 can well simulate and calculate the distribution of hydrodynamic salinity in the Changjiang Estuary, and the verification error is only 10 / 15. From the calculation results, it can be seen that the salt water intrusion is obviously related to the runoff. When the runoff of Datong station is 5 000 mm3 / s, both the south branch and the north branch of the Changjiang Estuary have saline intrusion. With the increase of runoff, the area of fresh water is further expanded from the right bank of the southern branch to the downstream. When the runoff exceeds 30 000 mm3 / s, there is no salt water intrusion in the southern branch, which can ensure the normal water intake safety of the reservoir. When there is wind force, the salt water intrusion is obvious, the salt water concentration is over 3.5 ppt, but the saltwater intrusion trend is weakened under the condition of no wind, the salinity of the south branch reach of the Yangtze River Estuary generally meets the irrigation water standard (2.2 鈥，
本文编号：2211119
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