Simulation of seawater intrusion and optimization of cutoff wall schemes based on surrogate model
Simulation of seawater intrusion and optimization of cutoff wall schemes based on surrogate model
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DOI：
10.1080/10807039.2018.1553611
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
Tian-sheng Miao;Wenxi Lu;Jin Lin;Jia-yuan Guo;Yue Fan
中科院分区：
文献类型：
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作者：
Tian-sheng Miao;Wenxi Lu;Jin Lin;Jia-yuan Guo;Yue Fan
摘要建立了龙口市海水入侵三维变密度数学模型。基于该模型，提出了适合研究区的防渗墙施工方案，并利用数学模型对防渗墙的效果进行了模拟和预测。将海水淡化技术引入防渗墙施工中，以工程造价最小为目标函数建立优化模型，并将仿真模型嵌入优化模型中进行计算。为了减少仿真模型的重复调用所带来的计算量，采用Kriging方法建立了仿真模型的代理模型。通过求解优化模型，得到了最优控制方案。结果表明：1.建立的三维变密度地下水入侵模型经过标定和验证，是一种可靠的地下水入侵危险性评价方法。2.代理模型可以在保证精度的同时显著减少计算量。3.利用基于代理模型的优化模型，可以快速地得到防渗墙设计的最优解，是SI风险管理的有效途径。
Abstract In the present study, a 3-D variable density mathematical model for seawater intrusion (SI) was built in Longkou City, China. Based on the model, a cutoff wall construction scheme suitable for the study area was proposed, and the mathematical model was used to simulate and predict the effects of the cutoff wall. By introducing the seawater desalination technology into the construction of the cutoff wall, the optimization model was built with the minimum cost as the objective function, and the simulation model was embedded into the optimization model for calculation. To reduce the huge amounts of computations caused by calling the simulation model repeatedly, a surrogate model of the simulation model was built using the Kriging method. The optimal control plan was obtained by solving the optimization model. The results show the following: 1. The 3-D variable density groundwater intrusion model built with calibration and verification is a reliable method of risk assessment of SI. 2. The surrogate model can significantly reduce the computational load while ensuring accuracy. 3. Using the optimization model based on the surrogate model, the optimal solution can be quickly yielded for the design of the cutoff wall, and it is an effective way for the risk management of SI.