南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (6): 1085–1094.doi: 10.13232/j.cnki.jnju.2018.06.004

• 环境工程地质学专栏 • 上一篇    下一篇

基于AHFO方法的Green－Ampt模型K0取值试验研究

梅世嘉１，施　斌１*，曹鼎峰１，魏广庆2，张　岩１，郝　瑞１   

  1. 1.南京大学地球科学与工程学院，南京，210023；2.苏州南智传感科技有限公司，苏州，215123
  • 接受日期:2018-05-07 出版日期:2018-12-01 发布日期:2018-12-01
  • 通讯作者: 施　斌,E－mail：shibin@nju.edu.cn E-mail:shibin@nju.edu.cn
  • 基金资助:
    国家重大科研仪器研制项目(41427801)，国家自然科学基金重点项目(41230636)

An experimental study on the value of K0 in Green－Ampt model based on AHFO technology

Mei Shijia1，Shi Bin1*，Cao Dingfeng1，Wei Guangqing2，Zhang Yan1，Hao Rui1   

  1. 1.School of Earth Science and Engineering，Nanjing University，Nanjing，210023，China； 2．Suzhou NanZee Sensing Co.，Ltd，Suzhou，215123，China
  • Accepted:2018-05-07 Online:2018-12-01 Published:2018-12-01
  • Contact: Shi Bin,E－mail：shibin@nju.edu.cn E-mail:shibin@nju.edu.cn

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摘要： 利用Van Genuchten经验函数拟合土水特征曲线，可获取反应土壤物理特性的参数m和n，求得体积含水率θ下的非饱和导水率Kθ，再利用Kθ代替饱和导水率K0，可获得Green－Apmt的修正模型. 过去受测试手段的限制，这类修正方法还未经过试验精确验证；传统的点式测量手段可通过数个点的体积含水率数据推测整个土壤的体积含水率剖面和湿润锋的位置，引起的误差常常比较大. 利用分布式的主动加热型的体积含水率光纤测试方法(actively heated fiber optic method，AHFO)，定位精度可达2.5 cm；设计了模型桶中砂土垂直向上入渗的渗流试验，测试了试验过程中土壤体积含水率剖面，并采用AHFO技术实时定位湿润锋的位置，大大提高了湿润锋定位准确性. 基于实测的体积含水率剖面及湿润锋位置，对K0修正前后Green－Apmt模型的准确性进行了测试. 结果表明：(1)非饱和土的渗透系数Kθ远小于饱和土的渗透系数K0，其大小可依据土壤特征曲线和AHFO法测得的土壤体积含水率确定，本次试验修正系数约为0.1；(2)湿润锋垂向运移距离与时间符合修改K0后的Green－Apmt模型；(3)AHFO法具有连续性和精确性的优点，可以作为评价土壤湿润过程的有效测试手段．

关键词: 非饱和土渗透系数, AHFO技术, 概化湿润锋, Green－Ampt模型, Van Genuchten经验函数

Abstract: The soil－water characteristic curve is studied using Van Genuchten expirical function to obtain the parameters m and n. And the saturation hydraulic conductivity in the Green－Apmt model was instead by unsaturated hydraulic conductivity under the soil moisture content. This type of correction method，limited by the test technology，has not yet been accurately measured experimentally in the past. It is not reliable to use moisture data from several points to infer the moisture content of the soil and the position of the wetting front by the point－based measurement. In this paper，a distributed active heated moisture content determination technology(AHFO technology with a positioning accuracy of 2.5 cm) was used to design the seepage test of vertical upward infiltration of sand in the model barrel. The soil moisture profile during the test was tested. The position of the wet front is positioned in real time through this technology，which greatly improves the accuracy of the location of the wet front. Based on this measured soil moisture content profile and wet front position，the accuracy of the Green－Apmt model correction was tested. The test results show that：(1)The permeability coefficient of unsaturated soil is far less than that of saturated soil，and its size can be based on The soil characteristic curve and the soil moisture content measured by the AHFO method are determined. The correction coefficient of this experiment is about 0.1；(2)The vertical migration distance and time of the wet front are in accordance with the modified Green－Apmt model，and the AHFO method has continuity. The advantages of precision and accuracy can be used as an effective tool for estimating soil moisture patterns.

Key words: hydraulic conductivity, the AHFO method, generalized water front, Green－Ampt model, Van Genuchten expirical function

中图分类号: 

  • TH764
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