RAINFALL INDUCED SOIL SEAL .B. APPLICATION OF A NEW MODEL TO SATURATED SOILS

被引：11

作者：

MUALEM, Y

ASSOULINE, S

ROHDENBURG, H

机构：

[1] The Hebrew Univ., Jerusalem Faculty, Agriculture Dept. of Soil and Water Sciences Rehovot

来源：

CATENA | 1990年 / 17卷 / 02期

关键词：

D O I：

10.1016/0341-8162(90)90009-3

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

A conceptual model is proposed in which the saturated soil seal (crust) properties are derived on the basis of physical concepts estimated empirically. The reduced hydraulic conductivity of the soil surface is attributed to its decreased porosity and increased "ineffective" water content. The characteristics of the modeled soil seal were examined using data of sandy loam and loam (loess) soils. An inverse approach was applied for calibration using infiltration rate data. The results indicate that the importance of the 0.1 mm compact clay and silt seal layer, the "skin", has been overestimated. The sealing of bare soils formed under highenergy rainfall cannot be attributed to the skin. The suggested theory allows the seal properties, including its thickness and hydraulic conductivity, to vary with respect to rain and soil properties as well as the flow boundary conditions. Seal thickness, hydraulic conductivity and conductance were calculated as a function of the driving hydraulic head for the two soils. The sandy loam had a thicker sealing layer with higher hydraulic conductivity (and sensitivity to flow conditions) than the loam. While the hydraulic conductance of the loam seal decreased slowly as a function of the hydraulic gradient, the conductance of the sandy loam soil dropped sharply with an increase in the hydraulic gradient, and reached a lower value than that of the loam for large gradients. © 1990.

引用

页码：205 / 218

页数：14

共 11 条

[1] Bresler, Heller, Diner, Benasher, Brandt, Goldberg, Infiltration from a Trickle Source: II. Experimental Data and Theoretical Predictions1, Soil Science Society of America Journal, 35, pp. 683-689, (1971)
[2] Chen, Tarchitzky, Brouwer, Morin, Banin, Scanning electron microscope observations on soil crusts and their formation, Soil Sci., 130, pp. 49-55, (1980)
[3] Kemper, Noonan, Runoff as Affected by Salt Treatments and Soil Texture1, Soil Science Society of America Journal, 34, pp. 126-130, (1970)
[4] McIntyre, PERMEABILITY MEASUREMENTS OF SOIL CRUSTS FORMED BY RAINDROP IMPACT, Soil Science, 85, pp. 185-189, (1958)
[5] McIntyre, SOIL SPLASH AND THE FORMATION OF SURFACE CRUSTS BY RAINDROP IMPACT, Soil Science, 85, pp. 261-266, (1958)
[6] Morin, Benyamini, Michaeli, The effect of raindrop impact on the dynamics of soil surface crusting and water movement in the profile, J. Hydrol., 52, pp. 321-335, (1981)
[7] Mualem, A catalogue of the hydraulic properties of unsaturated soils, (1976)
[8] Pagliai, Bisdom, Ledin, Changes in surface structure (crusting) after application of sewage sludge and pig slurry to cultivated agricultural soils in Northern Italy, Geoderma, 30, pp. 34-53, (1983)
[9] Shainberg, Rhoades, Suarez, Prather, Effect of Mineral Weathering on Clay Dispersion and Hydraulic Conductivity of Sodic Soils1, Soil Science Society of America Journal, 45, pp. 287-291, (1981)
[10] Shainberg, Singer, Effect of electrolyte concentrations on the hydraulic properties of depositional crusts, Soil Sci. Soc. Am. J., 49, pp. 1260-1263, (1985)

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