THE CONSTANT HEAD WELL PERMEAMETER: EFFECT OF UNSATURATED FLOW
THE CONSTANT HEAD WELL PERMEAMETER: EFFECT OF UNSATURATED FLOW
复制标题
恒定水头井渗透率：不饱和流量的影响
DOI：
10.1097/00010694-198502000-00011
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
B. Clothier
中科院分区：
文献类型：
--
作者：
W. Reynolds;D. Elrick;B. Clothier
本文将等水头井/流计(CHWP)理论进行了推广，以考虑非饱和渗流的影响。这导致了对田间饱和导水率的更准确的估计，并为现场估计土壤吸水率和指数导水率-压力扬程函数的α参数提供了新的方法。用扩展的CHWP理论和“平均”砂土、壤土和粘性土进行的计算表明，对于毛细作用弱的土壤，原来的CHWP理论只有很小的误差，但对于毛细作用强的土壤，可能会有很大的误差。推广的理论成功地预测了以往CHWP方法的数值研究结果。
In this paper, the constant head well per-meameter (CHWP) theory is extended analytically to account for the effects of unsaturated flow. This results in a more accurate estimate of the field-saturated hydraulic conductivity and in new methods for in situ estimation of the soil sorptivity and the α parameter of the exponential hydraulic conductivity-pressure head function. Calculations using the extended CHWP theory and “average”sand, loam, and clay soils indicate that the original CHWP theory is only slightly in error for soils exhibiting weak capillarity, but can be substantially in error for soils exhibiting strong capillarity. The extended theory successfully predicts results of previous numerical investigations of the CHWP method.