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Measuring soil hydraulic properties ...

Zhang, Zhuanfang.

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Measuring soil hydraulic properties and stochastic analysis of water movement using line sources.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Measuring soil hydraulic properties and stochastic analysis of water movement using line sources./
作者:	Zhang, Zhuanfang.
面頁冊數:	155 p.
附註:	Source: Dissertation Abstracts International, Volume: 60-08, Section: B, page: 3648.
Contained By:	Dissertation Abstracts International60-08B.
標題:	Agriculture, Soil Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ40393
ISBN:	9780612403932

Measuring soil hydraulic properties and stochastic analysis of water movement using line sources.
Zhang, Zhuanfang.

Measuring soil hydraulic properties and stochastic analysis of water movement using line sources. - 155 p.

Source: Dissertation Abstracts International, Volume: 60-08, Section: B, page: 3648.

Thesis (Ph.D.)--University of Guelph (Canada), 1999.

New analytical solutions to measure soil hydraulic properties below a line source using multi-purpose time domain reflectometry (TDR) probes were developed. We use the new solutions in an inverse procedure to estimate inverse macroscopic capillary length, alpha, and saturated hydraulic conductivity, Ks from pressure head (Psi), water storage (W), and solute travel time (T) measured by multi-purpose TDR probes placed below a line source with constant flux of water. The saturated soil water content, thetas, can also be estimated if prior information for it is available. The parameter and spatial sensitivities of each solution were calculated using sensitivity coefficients. Seven possible combinations of measurements can be used to estimate alpha, Ks and thetas. The uniqueness of each approach was tested by using two-dimensional response surfaces.

ISBN: 9780612403932Subjects--Topical Terms:

1017824
Agriculture, Soil Science.

Measuring soil hydraulic properties and stochastic analysis of water movement using line sources.
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245 1 0 $a Measuring soil hydraulic properties and stochastic analysis of water movement using line sources.
300 $a 155 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-08, Section: B, page: 3648.
500 $a Advisers: Gary W. Parkin; R. G. Kachanoski.
502 $a Thesis (Ph.D.)--University of Guelph (Canada), 1999.
520 $a New analytical solutions to measure soil hydraulic properties below a line source using multi-purpose time domain reflectometry (TDR) probes were developed. We use the new solutions in an inverse procedure to estimate inverse macroscopic capillary length, alpha, and saturated hydraulic conductivity, Ks from pressure head (Psi), water storage (W), and solute travel time (T) measured by multi-purpose TDR probes placed below a line source with constant flux of water. The saturated soil water content, thetas, can also be estimated if prior information for it is available. The parameter and spatial sensitivities of each solution were calculated using sensitivity coefficients. Seven possible combinations of measurements can be used to estimate alpha, Ks and thetas. The uniqueness of each approach was tested by using two-dimensional response surfaces.
520 $a A field method was designed to measure unsaturated soil hydraulic properties using multi-purpose TDR probes below a surface line source with constant flux of water. The surface line source was produced inside a greenhouse using a moving irrigation system. Two hundred multi-purpose TDR probes were vertically installed in the soil beneath the line source to measure Psi, W, and T. The soil hydraulic parameters were estimated using inverse procedures with new analytical solutions. Approximate confidence contours in the alpha-K s plane are used to show the accuracy of the parameter estimates. The information needed for parameter estimation is discussed. By approximating the solute travel solution, the three parameters can be obtained by optimizing the three sets of measurements sequentially. Hydraulic parameters were also measured using Guelph Permeameter (GP) and modified Guelph Pressure Infiltrometer (GPI) system.
520 $a Analytical solutions of the variance of pressure head, VarPsi , of the variance of soil water content, Vartheta, and of the variance of water storage, Varw, were developed for steady-state water movement from a surface line source using the small-perturbation, spectral, and probability density function (PDF) methods. The solutions were tested using data from field experiments. The model predictions of both Var Psi and Varw were very similar to the field data except VarPsi at the depth 0.8 m.
520 $a The existing analytical solution (Raats, 1970) for water infiltration from multiple surface line sources was, extended to water infiltration from multiple shallow trenches. Three-trench field experiments were carried out. The measured and the predicted water storage have the same horizontal variation pattern.
520 $a In addition the well factor for the Guelph Permeameter method in measuring soil hydraulic parameters was expressed using empirical formulae. A software, GP-Cal, was written for processing the Guelph Permeameter data.
590 $a School code: 0081.
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Hydrology. $3 545716
690 $a 0481
690 $a 0388
710 2 0 $a University of Guelph (Canada). $3 1018650
773 0 $t Dissertation Abstracts International $g 60-08B.
790 1 0 $a Parkin, Gary W., $e advisor
790 1 0 $a Kachanoski, R. G., $e advisor
790 $a 0081
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NQ40393