长江口咸潮入侵扩散响应函数及初步应用
发布时间：2019-05-26 19:01
【摘要】：咸潮入侵是入海径流和潮汐共同作用的盐度扩散过程。以量能累积与阻抗交互作用过程为理论基础,采用逻辑推理和数学分析推导了入海流量、潮差和咸潮入侵面积三者扩散响应的函数关系和曲线型态,并利用长江口近50年枯季入海流量、潮差和咸潮入侵面积进行了实证分析。结果表明,在一定入海流量条件下潮差与咸潮入侵面积关系具有S型曲线特征,入海流量与咸潮入侵最大面积关系也具有S型曲线特征,共同构成一个三维咸潮入侵扩散响应函数;长江口近50年的实测数据实证了上述三维关系特征,据此构建了双曲正切的S型长江口咸潮入侵扩散响应函数,并阐述了参数定值与量化方法;以此函数为基础,分析确定了长江口入海流量大于10 000 m3/s时可抵御大规模咸潮入侵,同时计算了2001—2012年咸潮入侵损失。
[Abstract]:Saltwater intrusion is a process of salinity diffusion caused by runoff and tide. Based on the interaction process between quantity energy accumulation and impedance, the functional relationship and curve pattern of diffusion response among inflow, tidal difference and salt tide intrusion area are derived by means of logical reasoning and mathematical analysis. Based on the discharge, tidal difference and salt tide invasion area in the dry season of the Changjiang Estuary in recent 50 years, an empirical analysis was carried out. The results show that the relationship between tidal difference and salt tide intrusion area has the characteristics of S-shaped curve, and the relationship between inflow and the maximum area of salt tide intrusion also has the characteristics of S-shaped curve under the condition of certain inflow. Together, a three-dimensional salt tide intrusion diffusion response function is constructed. The measured data of the Yangtze Estuary in recent 50 years demonstrate the above three-dimensional relationship characteristics, on the basis of which the hyperbolic tangent S-shaped salt tide intrusion diffusion function is constructed, and the parameter setting value and quantitative method are expounded. On the basis of this function, it is determined that the Changjiang Estuary can resist large-scale salt tide intrusion when the discharge is more than 10 000 m3. At the same time, the salt tide invasion loss from 2001 to 2012 is calculated.
【作者单位】： 中国水利水电科学研究院;
【基金】：国家重点研发计划资助项目(2016YFC0503502) 水利部公益性行业科研专项经费资助项目(201201073)~~
【分类号】：P731.23
[Abstract]:Saltwater intrusion is a process of salinity diffusion caused by runoff and tide. Based on the interaction process between quantity energy accumulation and impedance, the functional relationship and curve pattern of diffusion response among inflow, tidal difference and salt tide intrusion area are derived by means of logical reasoning and mathematical analysis. Based on the discharge, tidal difference and salt tide invasion area in the dry season of the Changjiang Estuary in recent 50 years, an empirical analysis was carried out. The results show that the relationship between tidal difference and salt tide intrusion area has the characteristics of S-shaped curve, and the relationship between inflow and the maximum area of salt tide intrusion also has the characteristics of S-shaped curve under the condition of certain inflow. Together, a three-dimensional salt tide intrusion diffusion response function is constructed. The measured data of the Yangtze Estuary in recent 50 years demonstrate the above three-dimensional relationship characteristics, on the basis of which the hyperbolic tangent S-shaped salt tide intrusion diffusion function is constructed, and the parameter setting value and quantitative method are expounded. On the basis of this function, it is determined that the Changjiang Estuary can resist large-scale salt tide intrusion when the discharge is more than 10 000 m3. At the same time, the salt tide invasion loss from 2001 to 2012 is calculated.
【作者单位】： 中国水利水电科学研究院;
【基金】：国家重点研发计划资助项目(2016YFC0503502) 水利部公益性行业科研专项经费资助项目(201201073)~~
【分类号】：P731.23
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