ANALYSIS OF SPATIAL VARIABILITY OF SPECIFIC PHYSICAL AND HYDRAULIC PROPERTIES OF SOIL ON A CATCHMENT SCALE

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MOTAGHIAN H.R.; KARIMI AHMAD; MOHAMMADI JAHANGARD

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Journal: Journal of Water and Soil Year:2008 | Volume:22 | Issue:2 Page(s): 432-446

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Title

ANALYSIS OF SPATIAL VARIABILITY OF SPECIFIC PHYSICAL AND HYDRAULIC PROPERTIES OF SOIL ON A CATCHMENT SCALE

Author(s)

MOTAGHIAN H.R. | KARIMI AHMAD | MOHAMMADI JAHANGARD | Issue Writer Certificate

Keywords

INFILTRATION RATEQ2

KRIGINGQ2

SATURATED HYDRAULIC CONDUCTIVITYQ2

SPATIAL VARIABILITYQ3

MARGHMALEK WATERSHEDQ3

BULK DENSITYQ3

Abstract

Analysis and interpreting SPATIAL VARIABILITY of soil hydraulic and physical properties on a catchment scale is important in hydrological modeling and decision making. This study was conducted to analyze and interpret spatial distribution of selected soil hydraulic and physical properties including clay, silt, and sand content, BULK DENSITY (BD), INFILTRATION RATE (IR) and SATURATED HYDRAULIC CONDUCTIVITY (Ks) in MARGHMALEK WATERSHED. In this research, 111 soil samples were collected in a regular spaced grid pattern of 1 km from 0-30 cm depth in order to determine the soil size distribution. In addition, at each sampling site undisturbed soil samples were obtained from the topsoil using cylinder method to determine soil BULK DENSITY and consequently the SATURATED HYDRAULIC CONDUCTIVITY. SATURATED HYDRAULIC CONDUCTIVITY was determined using the falling head method. Infiltration tests were conducted on all 111 sample sites using double-ring infiltrometers. Maximum coefficient of variation (CV) was found for IR (72%) and Ks (67%). In contrast, the minimum CV value of 8% was found for BD. Statistical analysis illustrated that there was a significant difference (P<0.05) in mean values of IR in two different landforms including plateaus and alluvial plains. However, different land using methods including natural pasture and dryland farming did not show significant differences in mean values of IR measurements. However, contrasting results were obtained for Ks. The strong Pearson correlation coefficients were found between IR and Ks (0.65), IR and BD (0.38), IR and clay content (-0.37), Ks and BD (0.40), and Ks and clay content (-0.31). The geostatistical analysis indicated that the spatially dependent stochastic component (structure) was predominant over the nugget variance (noise). All selected soil variables showed moderate to strong spatial dependence. Structured and modeled variograms of each variable were used in generating kriged maps.

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APA: Copy

MOTAGHIAN, H.R., KARIMI, AHMAD, & MOHAMMADI, JAHANGARD. (2008). ANALYSIS OF SPATIAL VARIABILITY OF SPECIFIC PHYSICAL AND HYDRAULIC PROPERTIES OF SOIL ON A CATCHMENT SCALE. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), 22(2), 432-446. SID. https://sid.ir/paper/141573/en

Vancouver: Copy

MOTAGHIAN H.R., KARIMI AHMAD, MOHAMMADI JAHANGARD. ANALYSIS OF SPATIAL VARIABILITY OF SPECIFIC PHYSICAL AND HYDRAULIC PROPERTIES OF SOIL ON A CATCHMENT SCALE. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)[Internet]. 2008;22(2):432-446. Available from: https://sid.ir/paper/141573/en

IEEE: Copy

H.R. MOTAGHIAN, AHMAD KARIMI, and JAHANGARD MOHAMMADI, “ANALYSIS OF SPATIAL VARIABILITY OF SPECIFIC PHYSICAL AND HYDRAULIC PROPERTIES OF SOIL ON A CATCHMENT SCALE,” JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), vol. 22, no. 2, pp. 432–446, 2008, [Online]. Available: https://sid.ir/paper/141573/en

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