城市绿地覆盖砂石后土壤水分入渗过程及模型分析

发布时间：2018-04-17 17:24

本文选题：银川市 + 入渗　；参考：《西北农林科技大学学报(自然科学版)》2017年07期

【摘要】：【目的】对城市绿地砂石覆盖土壤水分入渗过程进行研究和模型分析,为城市绿地水资源的合理利用提供理论参考。【方法】以银川城市绿地砂石覆盖土壤为研究对象,采用一维垂直定水头入渗法,选取砂石覆盖厚度为影响因子,设置5个覆盖厚度(0,2.5,5.0,7.5,10.0cm),观测湿润锋运移和累计入渗量变化规律,比较各处理土壤入渗特征,并用Horton、Kostiakov、Philip和通用经验模型模拟土壤的入渗过程,从中选出模拟效果最佳的模型。【结果】不同砂石覆盖厚度条件下湿润锋进程与入渗时间呈显著的函数关系,影响大小依次为10.0cm7.5cm5.0cm2.5cm0cm。砂石覆盖可以提高土壤初始入渗速率、稳定入渗速率、平均入渗速率和累计入渗量。与无覆盖相比,砂石覆盖厚度为2.5,5.0,7.5,10.0cm时的初始入渗速率分别增加了2.4%,5.2%,23.4%,27.6%;稳定入渗速率分别增加了6.0%,25.3%,32.8%,82.0%;平均入渗速率分别增加了12.5%,29.2%,39.6%,79.2%;累计入渗量分别增加了4.2%,11.7%,12.7%,17.0%。利用4种入渗模型拟合覆盖不同厚度砂石的土壤水分入渗过程,发现Horton模型拟合效果最好,Kostiakov模型次之,Philip模型和通用经验模型拟合效果较差。【结论】城市绿地覆盖砂石可以提高土壤入渗速率,增加入渗量,其中以覆盖厚度为10.0cm时最高,且Horton模型是拟合砂石覆盖与水分入渗关系的最佳模型。
[Abstract]:[objective] to study and analyze the infiltration process of sand and stone mulching soil water in urban green space, and to provide a theoretical reference for the rational utilization of urban green water resources. [methods] the sand and stone mulching soil in Yinchuan city was taken as the research object.In this paper, the vertical head infiltration method is adopted, and the sand and stone cover thickness is selected as the influencing factor. Five mulch thickness (0. 2. 5 5) and 7. 510. 0 cm ~ (-1) are set up to observe the change law of moisture front migration and cumulative infiltration, and to compare the infiltration characteristics of different treatments.Hortonite Kostiakov-Philip and the general empirical model were used to simulate the infiltration process of soil, and the best model was selected. [results] there was a significant functional relationship between the wetting front process and infiltration time under different sand and stone cover thickness, and the influence was 10.0 cm 7.5 cm 5.0 cm 2.5 cm cm 路cm m.Sand and stone mulch can increase initial infiltration rate, steady infiltration rate, average infiltration rate and cumulative infiltration rate.Compared with no mulch, the initial infiltration rate of sand and stone with thickness of 2.55.0 ~ 7.5ng / 10.0cm was increased by 2.4and 5.2ng / 23.427.6cm, respectively; the steady infiltration rate was increased by 6.0and 25.30.32. 82.0.The average infiltration rate increased by 12.529.29.6m 79.2, respectively; and the cumulative infiltration increased by 4.211.77.70.The total infiltration volume was increased by 12.77.70.The results showed that the initial infiltration rate of sand and stone increased by 4.211.712.77.00.Compared with that without mulch, the initial infiltration rate of sand and stone was increased by 2.55.0cm and 7.55.0cm, and the cumulative infiltration increased by 4.211.712.77.0.Four infiltration models were used to fit the infiltration process of soil water covered with sand and stone with different thickness.It was found that the fitting effect of Horton model was better than that of Kostiakov model, and the fitting effect of Philip model and general empirical model was poor. [conclusion] the sand and stone mulch in urban green space can increase the infiltration rate and the infiltration amount, especially when the covering thickness is 10.0cm.The Horton model is the best model to fit the relationship between sand cover and water infiltration.
【作者单位】：宁夏大学资源环境学院;
【基金】：国家自然科学基金项目(41461104) 宁夏自然科学基金项目(NZ14028)
【分类号】：S152.7

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