Department of Civil and Environmental Engineering, Federal University of Paraíba, João Pessoa, Brazil.
Water Sci Technol. 2012;66(10):2099-108. doi: 10.2166/wst.2012.426.
A major risk concerning the calibration of physically based erosion models has been partly attributable to the lack of robust optimization tools. This paper presents the essential concepts and application to optimize the erosion parameters of an erosion model using data collected in an experimental basin, with a global optimization method known as simulated annealing (SA) which is suitable for solving optimization problems of large scales. The physically based erosion model that was chosen to be optimized here is the Watershed Erosion Simulation Program (WESP), which was developed for small basins to generate the hydrograph and the respective sedigraph. The field data were collected in an experimental basin located in a semiarid region of Brazil. On the basis of these results, the following erosion parameters were optimized: the soil moisture-tension parameter (N(s)) that depends also on the initial moisture content, the channel erosion parameter (a), the soil detachability factor (K(R)), and the sediment entrainment parameter by rainfall impact (K(I)), whose values could serve as initial estimates for semiarid regions within northeastern Brazil.
物理侵蚀模型校准的一个主要风险部分归因于缺乏稳健的优化工具。本文提出了基本概念和应用，以使用在实验流域收集的数据，通过一种称为模拟退火（SA）的全局优化方法来优化侵蚀模型的侵蚀参数，该方法适用于解决大规模优化问题。选择进行优化的物理侵蚀模型是流域侵蚀模拟程序（WESP），该模型是为小流域开发的，用于生成流量和相应的泥沙图。现场数据是在巴西半干旱地区的一个实验流域收集的。基于这些结果，优化了以下侵蚀参数：土壤水分张力参数（N(s）），该参数还取决于初始含水量、河道侵蚀参数（a）、土壤可分离性因子（K(R)）和降雨冲击引起的泥沙夹带参数（K(I)），这些参数的值可作为巴西东北部半干旱地区的初始估计值。
