上覆碳酸盐岩红土层对磷石膏水分运移的影响及Green-Ampt模型模拟  

Effect and simulation of overlying carbonate red soil layers on water migration in phosphogypsum

作　　者：陈浩 刘冬冬 冯娜[3] 杨娅 唐俊杰 Chen Hao;Liu Dongdong;Feng Na;Yang Ya;Tang Junjie(Colleage of Resource and Environment Engineering,Guizhou University,Guiyang,Guizhou 550000,China;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guiyang,Guizhou 550000,China;Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha,Hunan 410000,China)

机构地区：[1]贵州大学,资源与环境工程学院,贵州贵阳550000 [2]喀斯特地质资源与地质环境教育部重点实验室,贵州贵阳550000 [3]中国科学院亚热带农业生态研究所,湖南长沙410000

出　　处：《水土保持通报》2025年第1期225-234,共10页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金项目“孔/裂隙水驱动下垦殖坝地土壤—表层岩溶带氮肥的快速流失机制”(42067004);贵州省优秀青年人才项目(黔科合平台人才-YQK[2023]005);贵州省水利科技经费项目(KT201803)。

摘　　要：[目的]分析上覆碳酸盐岩红土对磷石膏入渗特性的影响机制,为西南喀斯特地区磷石膏堆场合理处置及利用提供科学依据。[方法]通过室内扁平土柱入渗试验研究3种磷石膏容重(1.2,1.3,1.4 g/cm^(3))和3种上覆土层厚度(0,6,12 cm)对磷石膏水分入渗过程的影响,并通过改进的分层型Green-Ampt模型进行入渗过程数值模拟。[结果](1)6和12 cm覆土厚度处理下水分入渗到底部的时间差异不显著(p>0.05),而在0与6 cm、0与12 cm覆土厚度处理下入渗时间差异显著(p<0.05)。覆土厚度为0 cm的初始入渗率、平均入渗率和稳定入渗率显著高于6,12 cm的初始入渗率、平均入渗率和稳定入渗率(p<0.05),稳定入渗率随覆土厚度增大而显著减小。6,12 cm覆土厚度累积入渗量差异不显著(p>0.05),其余覆土厚度之间累积入渗量差异显著(p<0.05)。(2)相同覆土厚度下,磷石膏容重对初始入渗率、平均入渗率和稳定入渗率的影响均不显著(p>0.05)。(3)湿润峰深度实测值与模拟值决定系数(R^(2))变化范围为0.951~0.995,均方根误差(RMSE)为12.174~40.856,平均绝对百分比误差(MAPE)为0.070~0.227。覆土6和12 cm时,累积入渗量实测值与模拟值决定系数(R~2)变化范围为0.963~0.999,均方根误差(RMSE)为1.471~11.201,平均绝对百分比误差(MAPE)为0.046~0.169。[结论]磷石膏覆土与未覆土的土壤水分入渗特征存在显著差异,改进的分层型Green-Ampt模型能够用于模拟上覆土层条件下磷石膏的入渗过程。[Objective]The influence of overlying carbonate red soil on the infiltration characteristics of phosphogypsum was analyzed in order to provide an scientific basis for the rational disposal and utilization of phosphogypsum storage yards in southwest karst areas.[Methods]The influences of three phosphogypsum bulk densities(1.2,1.3,1.4 g/cm^(3))and three overburden thicknesses(0,6,12 cm)on the water infiltration process of phosphogypsum were studied through an indoor flat soil column infiltration test,and the infiltration process was numerically simulated using the improved layered Green-Ampt model.[Results]①The difference in water infiltration time to the bottom between the 6 cm and 12 cm soil cover treatments was not significant(p>0.05).However,significant differences in infiltration time were observed between the 0 and 6 cm treatments,as well as between the 0 and 12 cm treatments(p<0.05).The initial infiltration rate,average infiltration rate,and stable infiltration rate of the 0 cm soil cover were significantly higher than those of the 6 and 12 cm soil cover(p<0.05),and the stable infiltration rate decreased significantly with the increase in soil cover thickness.There was no significant difference in cumulative infiltration between the 6 and 12 cm cover soil thicknesses(p>0.05),but there was a significant difference among the other cover soil thicknesses(p<0.05).②For the same cover thickness,the influence of phosphogypsum bulk density on the initial infiltration rate,average infiltration rate,and stable infiltration rate was not significant(p>0.05).③The coefficient of determination(R^(2))between the measured and simulated values of the wetting peak depth varied was 0.951-0.995,the root mean square error(RMSE)ranged was 12.174-40.856,and the average absolute percentage error(MAPE)ranged was 0.070-0.227.When the soil was covered at 6 and 12 cm,the variation range of the determination coefficient(R^(2))between the measured and simulated values was 0.963-0.999,the root mean square error(RMSE)was 1.471-11.201,

关 键 词：覆土 磷石膏 水分运移 GREEN-AMPT模型 

分 类 号：S157.1[农业科学—土壤学] TQ177.3[农业科学—农业基础科学]