Estimation of vertical hydraulic conductivity based on single-ring permeameter falling head infiltration experiment
-
摘要: 在Philip与Nestingen土壤水运动计算方法基础上,推导出描述单环变水头入渗试验中水深变化过程的计算公式,提出了确定土壤垂向渗透系数的MP方法.利用土壤非饱和数值模拟及室内土槽入渗试验得到的单环水位变化过程,验证了MP方法推求土壤垂向渗透系数的可靠性.结果表明:MP方法推求的土壤垂向渗透系数比目前采用的Philip方法、Nestingen方法及Green-Ampt方法精度更高,具有广泛的应用前景.
-
关键词:
- 单环变水头入渗 /
- Green-Ampt方法 /
- 球缺扩散 /
- 垂向渗透系数
Abstract: Based on the Philip's method and the Nestingen's method for soil water infiltration computation,a new modified Philip(MP) method describing the variation of water depth in a single-ring permeameter is proposed for estimating vertical hydraulic conductivity.The MP method was validated on the basis of water depths in the single-ring permeameter from a numerical simulation and experiment results with in indoor troughs.The result indicates that the estimated vertical hydraulic conductivity using the MP method is more accurate than those of using the original Philip method,the Nestingen method,and the Green-Ampt method,which shows prospects for future applications. -
[1] BICKNELL B R,IMHOFF J C,KITTLE J L,et al.Hydrological Simulation program-FORTRAN(HSPF):User's manual for release 12.2[R].Washington:Environmental Protection Agency,1984. [2] MARK R,JEFFREY G,ALAA A,et al.Integrated hydrologic model(IHM) volume:1 Theory manual[R].Florid:Tampa Bay Water and Southwest Florida Water Management District,2004. [3] MARKSTROM S L,NISWONGER R G,REGAN R S,et al.GSFLOW-coupled ground-water and surface-water flow model based on the integration of the Precipitation-Runoff Modeling System(PRMS) and the Modular Ground-Water Flow Model(MODFLOW-2005)[R].Reston,VA:USGS,2008. [4] 樊军,邵明安,王全九.田间测定土壤导水率的方法研究进展[J].中国水土保持科学,2006,4(2):114-119.(FAN Jun,SHAO Ming-an,WANG Quan-jiu.Development about methods of soil hydraulic conductivity determination in fields[J].Science of Soil and Water Conservation,2006,4(2):114-119.(in Chinese)) [5] PHILIP J R.Falling head ponded infiltration[J].Water Resour Res,1992,28:2147-2148. [6] PHILIP J R.Approximate analysis of falling headlined borehole permeameter[J].Water Resour Res,1993,29:3763-3768. [7] REGALADO C M,RITTER A,ÁLVAREZ-BENEDÍ J,et al.Simplified method to estimate the Green-Ampt wetting front suction and soil captivity with the Philip-Dunne Falling-Head Permeameter[J].Vadose Zone J,2005,4:291-299. [8] NESTINGEN R.The comparison of infiltration devices and modification of the Philip-Dunne permeameter for the assessment of rain gardens[D].Minnesota:University of Minnesota,2007. [9] SHAMPINE L F,GORDON M K.Computer solution of ordinary differential equations:the initial value problem[M].San Francisco:Freeman,1975. [10] CARSEL R F,PARRISH R S.Developing joint probability distributions of soil water retention characteristics[J].Water Resour Res,1988,24(5):755. [11] THOMS R B,JOHNSON R L,HEALY R W.User's guide to the Variably Saturated Flow(VSF) Process for MODFLOW[R].Reston,VA:USGS,2006. [12] BOUWER H.Unsaturated flow in ground-water hydraulics[J].J Hydraul Div Amer Soc Civil Eng,1964,90:121-144. [13] PHILIP J R.Plant water relations:Some physical aspects[J].Ann Rev Plant Physiol,1966,17:245-268. [14] SCHAAP M G,AND LEIJ F J.Database related accuracy and uncertainty of pedotransfer functions[J].Soil Science,1998,163:765-779. -

计量
- 文章访问数: 11
- HTML全文浏览量: 3
- PDF下载量: 1072
- 被引次数: 0