南京大学学报(自然科学版) ›› 2015, Vol. 51 ›› Issue (1): 6066.
骆乾坤*,吴剑锋2,杨运3,钱家忠1
Luo Qian-Kun1, Wu Jan-Feng2, Yang Yun3, Qian Jia-Zhong1
摘要: 噪声遗传算法(Noisy genetic algorithm, NGA)是近年来引入到地下水领域处理参数空间变异性的新方法。本文针对渗透系数空间变异程度对基于NGA策略的进化算法求解效果影响展开研究,探索NGA策略适用范围。研究结果表明:当渗透系数对数方差()小于1.0时,采用NGA取样策略,提高算法计算效率的同时不会影响优化结果可靠性;当增加到2.0甚至3.0, 5.0时,算法优化结果不再具有高可靠性。通过增加NGA最大取样数可以提高算法求解精度,有效降低优化结果的不确定性。但随着最大取样数的增加,优化结果精度和可靠性将不再有明显提高。此时需寻求其他方法,如增加资金投入,获取渗透系数条件点,降低渗透系数场不确定性,从而获得更加准确可靠的优化方案。
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