吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (3): 848-859.doi: 10.13278/j.cnki.jjuese.201703205
康学远1,2, 施小清1, 史良胜2, 吴吉春1
Kang Xueyuan1,2, Shi Xiaoqing1, Shi Liangsheng2, Wu Jichun1
摘要: 重质非水相有机污染物(DNAPL)泄漏到地下后,其运移与分布特征受渗透率非均质性影响显著。为刻画DNAPL污染源区结构特征,需进行参数估计以描述水文地质参数的非均质性。本研究构建了基于集合卡尔曼滤波方法(EnKF)与多相流运移模型的同化方案,通过融合DNAPL饱和度观测数据推估非均质介质渗透率空间分布。通过二维砂箱实际与理想算例,验证了同化方法的推估效果,并探讨了不同因素对同化的影响。研究结果表明:基于EnKF方法同化饱和度观测资料可有效地推估非均质渗透率场;参数推估精度随观测时空密度的增大而提高;观测点位置分布对同化效果有所影响,布置在污染集中区域的观测数据对于参数估计具有较高的数据价值。
中图分类号:
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