排水暗管 meaning in English

closed drain

Compared with the reality , it shows that this model and its parameters are defined reasonablly . to analyse the arrangement of drainage system with different spacings and depths , with unsteady flow formula and benefit index , this paper gives a two - dimensional non - linear programing model for arrangement of drainage system in the barley field , which can be solved by the method of projected gradient . by this model , we make out the optimum solution of spacings and depth of pvc pipe in littoral area of changjiang river that is s = 21 . 5 8m , h = l . lm
论文通过对不同埋深、间距的塑料暗管排水布局的分析，结合非稳定流公式和效益指标，提出了麦田排水暗管布局的二维非线性规划模型，并利用梯度投影法求解，得出长江下游滨海地区塑料排水暗管埋设的最优方案为埋深h = 1 . 1m ，间距s = 21 . 58m 。