基于Morris's OAT设计的海水入侵数值模拟灵敏度分析
首发时间:2012-02-17
摘要:研究利用Morris's OAT设计对模拟的海水入侵距离和混合带宽度进行了灵敏度分析,分析因素包括淡水出逸流量、潮汐水位、渗透率、孔隙度、纵向弥散度、横向弥散度、分子扩散系数、水动力粘度、土体压缩系数和流体压缩系数,最后得出结论:模拟的海水入侵距离和混合带宽度对各影响因素的灵敏度相对随深度变化;入侵距离前四个最敏感因素依次为渗透率、潮汐作用、边界出逸流量和纵向弥散度,混合带宽度前四个最敏感因素依次为渗透率、潮汐作用、纵向弥散度和边界出逸流量,其它因素对模拟结果影响不大;模拟结果随渗透率、孔隙度、潮汐作用和边界出逸流量增大而增大,随弥散度增大而减小。利用Morris's OAT设计可以得到模拟结果对各影响因素灵敏度的相对大小关系,用来筛选相对重要的因素。
关键词: 海水入侵 数值模拟 灵敏度分析 Morris's OAT设计
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Sensitivity Analysis of Seawater Intrusion Simulation Based on Morris's OAT Design
Abstract:In this paper, the sensitivity of simulated intrusion distance and the length of mixing zoon to some factors, including influx of freshwater, tidal effect, permeability, porosity, dispersivity, diffusivity, viscosity, compressibility of soil and compressibility of fluid, was analysised with Morris's OAT design. It's included that the sensitivity of simulated results vary with depth. The most sensitivity factors include permeability, tidal effect, influx of freshwater and dispersivity. The simulated results increase with increase of permeability, porosity, amplitude of tide and influx of freshwater, and decrease of diffusivity.
Keywords: seawater intrusion numerical simulation sensitivity analysis Morris's OAT design
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