Aiming at the dentate boundary problem which is brought by the traditional Cartesian method, Part 4 introduces the diagonal Cartesian method to improve the former 2-d flow mathematic model.
第四部分针对笛卡尔坐标方法处理复杂边界存在的锯齿状问题，引进斜对角笛卡尔方法，对已有的蓄滞洪区二维水流数学模型进行了改进。
In Part III, the significance, problem and methods of integrating plane 2-d sediment mathematical model with geographical information system (GIS) are discussed.
第三部分对GIS与平面二维泥沙数学模型集成意义、问题和方法进行了分析。
In Part III, the significance, problem and methods of integrating plane 2-d sediment mathematical model with geographical information system (GIS) are discussed.
第三部分对GIS与平面二维泥沙数学模型集成意义、问题和方法进行了分析。
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