【摘要】：咸潮入侵是入海徑流和潮汐共同作用的鹽度擴散過程。以量能累積與阻抗交互作用過程為理論基礎,采用邏輯推理和數(shù)學分析推導了入海流量、潮差和咸潮入侵面積三者擴散響應的函數(shù)關系和曲線型態(tài),并利用長江口近50年枯季入海流量、潮差和咸潮入侵面積進行了實證分析。結果表明,在一定入海流量條件下潮差與咸潮入侵面積關系具有S型曲線特征,入海流量與咸潮入侵最大面積關系也具有S型曲線特征,共同構成一個三維咸潮入侵擴散響應函數(shù);長江口近50年的實測數(shù)據(jù)實證了上述三維關系特征,據(jù)此構建了雙曲正切的S型長江口咸潮入侵擴散響應函數(shù),并闡述了參數(shù)定值與量化方法;以此函數(shù)為基礎,分析確定了長江口入海流量大于10 000 m3/s時可抵御大規(guī)模咸潮入侵,同時計算了2001—2012年咸潮入侵損失。
[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.
【作者單位】： 中國水利水電科學研究院;
【基金】：國家重點研發(fā)計劃資助項目(2016YFC0503502) 水利部公益性行業(yè)科研專項經(jīng)費資助項目(201201073)~~
【分類號】：P731.23

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本文編號：2485558