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首页> 外文会议>Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research >OPTIMAL DETERMINATION OF THE T-HOUR UNIT HYDROGRAPH BY USING GOAL ATTAINMENT METHOD
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OPTIMAL DETERMINATION OF THE T-HOUR UNIT HYDROGRAPH BY USING GOAL ATTAINMENT METHOD

机译：采用目标达到方法，最佳测定T型小时单位水文

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摘要

T-hour Unit Hydrograph (TUH) is widely used in simulating surface runoff process in river basins. Traditional ways, like the Least Squared (LS) method, of deriving the TUHs are prone to produce a saw-tooth TUH, because of the mistaken data, or/and simplification of the hydrological process (to be linear) of the river basin. This paper applies a so-called Goal Attainment (GA) method to obtain an optimal TUH. The GA method is a multi-objective optimization method. In its implementation in this paper, it consists of three objectives and one constraint. The three objectives are: (1) minimizing the deviation between the observed and computed surface rtmoffs; (2)total water volume of the accumulated TUH coordinates being equal to that of the unit effective rainfall; (3) the total volume of the calculated surface runoffs being equal to that of the observed ones. The constraint is used to enable the recession limb of the TUH to be declining monotonically. The LS method is also applied for comparison. The data from the Wills Creek (in Maryland, the USA) are used for case study. The results show that the GA method has suppressed the saw-tooth phenomenon successfully in the recession limb of the TUH. And the goodness-of-fit of the calculated against observed surface runoff of the two methods are similar.
机译：T-Hours单位水文照片（TUH）广泛用于河流盆地模拟表面径流过程。传统方式，如最小二乘（LS）方法，导出Tuhs的易于产生锯齿Tuh，因为错误的数据，或/和简化河流域的水文过程（以线性）。本文适用于所谓的目标达到（GA）方法来获得最佳TUH。 GA方法是一种多目标优化方法。在本文的实施中，它包括三个目标和一个约束。三个目标是：（1）最小化观察到的表面RTMOFF之间的偏差; （2）累计TUH坐标的总水量等于单位有效降雨量的坐标; （3）计算的表面径流的总体积等于观察到的表面径流。约束用于使TUH的衰退率逐渐下降。 LS方法也用于比较。来自WILLS CREEK（在马里兰州，美国）的数据用于案例研究。结果表明，GA方法在Tuh的衰退中成功抑制了锯齿现象。并且对两种方法的观察到表面径流计算的拟合的优异性是相似的。

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