The water quality simulation of BOD_5 must adopt the BOD_5—DO coupling model.
使生化需氧量BOD_5的模拟所需采用的BOD_5—DO耦合模型的求解十分困难。
On this basis, an unascertained model of water quality simulation is established.
在此基础上，建立未确知水质模拟模型。
Case study showed that the models provided here are quite suitable for river water quality simulation and risk assessment.
实例研究表明，所建模型对于河流水质模拟与风险评价具有很好的适用性。
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