WRRCTR No.148 Soil and Sampling Scheme for Characterizing Soil Hydraulic Properties of a Watershed

dc.contributor.author Bresler, Eshel en_US
dc.contributor.author Green, Richard E. en_US
dc.date.accessioned 2008-07-17T22:36:55Z
dc.date.available 2008-07-17T22:36:55Z
dc.date.issued 1982-12 en_US
dc.description.abstract Watershed modeling, which incorporates the stochastic nature of the hydraulic properties of the land surface and rainfall, requires a mathematical description of watershed variability, including the frequency distribution of key hydrologic parameters and the spatial structure of variances. Heterogenous watersheds require extensive sampling to characterize the spatial distribution of a property, such as hydraulic conductivity, which is frequently required as input to model calculations of infiltration and runoff. Since hydraulic conductivity, K, varies with water content, Ө, and soil water pressure, h, the K(Ө) and X(h) relationships can be conveniently represented by parameters in mathematical expressions relating these variables. The parameters of three different equations are examined as indices of the hydraulic properties of Oxisol soils in Hawaii's Pearl Harbor watershed. When what to measure and how to mathematically express the results is decided, the number and location of field measurement sites in a particular watershed are determined. Geostatistical concepts are applied to design a sampling scheme for a specific watershed in which the measured value of a hydrologic property or index at a given point is correlated with other measured values of the property that is dependent on the distance between sampling points. Required statistical parameters for the geostatistical approach are the mean, variance, and autocorrelation function or variogram. Criteria are specified for selecting the location and smallest possible number of observation points to best estimate the statistical parameters. The results suggest that 30 measurement sites are the minimum sample size for estimating the parameters required for stochastic modeling. The proposed sampling procedure is illustrated with a sampling strategy for a portion of the Pearl Harbor watershed. en_US
dc.description.sponsorship U.S. Department of the Interior Office of Water Policy Grant/Contract No. 14-34-0001-2113 (A-094-HI) en_US
dc.format.extent vii + 42 pages en_US
dc.identifier.citation Bresler E, Green RE. 1982. Soil parameters and sampling scheme for characterizing soil hydraulic properties of a watershed. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 148. en_US
dc.identifier.uri http://hdl.handle.net/10125/1983
dc.language.iso en-US en_US
dc.publisher Water Resources Research Center, University of Hawaii at Manoa en_US
dc.relation.ispartofseries WRRC Technical Report en_US
dc.relation.ispartofseries 148 en_US
dc.subject hydraulic conductivity en_US
dc.subject hydrologic models en_US
dc.subject sampling statistics en_US
dc.subject surface-groundwater relationships en_US
dc.subject soil water en_US
dc.subject watershed (basins) en_US
dc.subject Monte Carlo method en_US
dc.subject Hawaii en_US
dc.subject soil hydraulic indices en_US
dc.subject geostatistics en_US
dc.subject saturated conductivity en_US
dc.subject drainage-flux method en_US
dc.subject kriging en_US
dc.subject autocorrelation en_US
dc.subject variogram en_US
dc.subject spatial variability en_US
dc.subject oxisols en_US
dc.subject Pearl Harbor en_US
dc.subject Oahu en_US
dc.subject.lcsh Hydrologic cycle -- Mathematical models. en_US
dc.subject.lcsh Hydrologic models -- Hawaii -- Oahu. en_US
dc.subject.lcsh Oxisols -- Hawaii -- Oahu. en_US
dc.subject.lcsh Pearl Harbor (Hawaii) en_US
dc.subject.lcsh Watersheds -- Hawaii -- Oahu -- Mathematical models. en_US
dc.title WRRCTR No.148 Soil and Sampling Scheme for Characterizing Soil Hydraulic Properties of a Watershed en_US
dc.type Report en_US
dc.type.dcmi Text en_US
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