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Dispersion and permeability of arid soils as affected by salt concentration and exchangeable cationsAbu-Fakhr, Mahmud Suleiman Sayyid Ahmad, January 1956 (has links) (PDF)
Thesis (M.S. - Agricultural Chemistry & Soils)--University of Arizona. / Bibliography: leaves 53-55.
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Water infiltration responses to soil management practicesDixon, Robert Morton, January 1966 (has links)
Thesis (Ph. D.)--University of Wisconsin, 1966. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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The dynamic interplay of mechanisms governing infiltration into structured and layered soil columns : a thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy at Lincoln University /Carrick, Sam January 2009 (has links)
Thesis (Ph. D.) -- Lincoln University, 2009. / Also available via the World Wide Web.
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Effects of ion concentration on the force field controlling the transmission of water through clay soils.Paul-Douglas, Gabrielle. January 1969 (has links)
No description available.
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An investigation of field application of a hydrologic unsaturated-saturated flow model.Sargent, Blaine P. 01 January 1983 (has links) (PDF)
No description available.
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Evaluation of Swale DesignAnderson, David E. 01 April 1982 (has links) (PDF)
Swales are designed to infiltrate runoff from intermittent storm events. Present design methodologies have resulted in swales which operate under several conditions; these conditions are soil, vegetation, climatic and geographical location dependent. To attain a swale design which considers and accounts for the important factors under Florida conditions, adequate assessment of rainfall, overland, flow, infiltration and soil moisture must be given priority treatment. Several roadside and residential swales were studied and relationships were drawn for soil moisture, porosity and infiltration rates. A design methodology is included and computer modeling infiltration aids in the design.
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Evaluation of two furrow infiltration measuring methods and furrow spacingsNyawakira, Bernard, 1955- January 1989 (has links)
The effect of furrow spacing on infiltration should be determined in order to properly design an irrigation system. The blocked furrow infiltrometer (BFI) and the flowing furrow infiltrometer (FFI) methods were investigated for this purpose in two areas upon a precision field furrow. Three irrigations were performed in each method. The initial and final soil moisture contents (before and after irrigation), the furrow cross-section (before and after irrigation), the inflow volume and the furrow water surface elevations (during irrigation) were measured in each test furrow. Cumulative infiltration and infiltration rates were determined for each irrigation. The results indicate that the FFI test furrows infiltrated more water than did the BFI test furrows for the same infiltration time. The infiltration rates were higher in the FFI test furrows than in the BFI test furrows until they approach the basic intake rate. The infiltration rates were also higher during the 0.90 m spacing tests than during the 1.80 m spacing tests. The 0.90 m spacing test furrows infiltrated more water than did the 1.80 m spacing test furrows.
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Infiltration of water into unsaturated soilsWong, Hong-yau., 黃康祐. January 1966 (has links)
published_or_final_version / Civil Engineering / Master / Master of Science in Engineering
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Salt and water movement in soils following heavy applications of feedlot wasteAmoozegar-Fard, Azizolah. January 1977 (has links)
The movement of salts in soils following application of feedlot wastes was studied experimentally and theoretically. The objectives of the study were (1) to evaluate the movement of salts in the soil following heavy application of animal wastes as related to the aggregate sizes of manure and water management practices and (2) to develop a mathematical model to predict the movement of salts within the soil and manure mixture. In the experimental study, air dried manure was formed into three distinct sizes, small (to pass 40 mesh sieve), medium (0.9 am in diameter, 1.2 cm in length), and large (1.8 cm in diameter, 1.8 cm in length). Soil columns of 15 cm inside diameter were packed with 30 cm of a soil-manure mixture over a 10 cm depth of soil. The manure application rate was equivalent to 100 metric tons/ha calculated on the basis of the cross-sectional area of the column. A total of five pore volumes of water was passed through the soil under continuous and intermittent water applications. The leachates were collected in 1/2 pore volume increments and the volume, EC, and pH determined immediately. Within 48 hours of the sampling, the leachates were analyzed for Na, K, Ca, Mg, Cl, and five trace elements (Fe, Mn, Zn, Cu, and Ni). The EC of the leachate for the first 1/2 pore volume was significantly (1% level) highest for the small-sized aggregates and the lowest for the large aggregate treatments under both moisture regimes. During the second increment, the order was reversed. In the later water applications, the EC for small aggregates was higher than the other sizes. There were no significant differences between the EC of the leachate from medium and large aggregate treatments during the later periods under either water treatments. Under both moisture regimes, the amount of Na removed from small aggregates decreased more rapidly than the other sizes. More than 90% of the total Na added to the system by manure was removed from the small aggregate treatment. In contrast, the highest amount of K removed (895 mg from small-sized aggregates under continuous leaching' represents about 35% of the total amount present In the manure applied. More Ca was removed from the small-sized aggregate treatments under both moisture regimes than was added by manure application. As for Mg the pattern of the removal was similar to that of Ca. No Cl was detected in the leachate after the fifth 1/2 pore volume was displaced. A mathematical model was developed to predict the movement of readily soluble ions such as Na, K, and Cl from different aggregate sizes of manure. The theoretical curves were compared with earlier experimental data and the parameters appearing in the mathematical equation were estimated. The results for Cl, Na, and K are presented graphically, and the estimated parameters as well as the values of the square roots of the sum of the squares between the theoretical and experimental values as percentage of the sum of the experimental values (SSR) are reported. From the low value of SSR's, it is evident that the model can predict the movement of the readily soluble ions from different aggregate sizes of manure quite accurately. A discussion on the suitability of the model for different sizes of manure aggregates and also a comparison between two different procedures to fit the model to the experimental data are given. In addition, a three phase theoretical model was developed to describe the movement of readily soluble ions from a soil-manure-water system. Experimental data were used in testing the model. The results for Na, K, and Cl are presented graphically. Estimated parameters for the experimental system and the values of SSR are presented. This model also can predict the movement of readily soluble ions from a soil-manure-water system.
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Water and solute transport : modeling and application to water conservation in layered soilMohammed, Fareed H. A. N. 23 July 1992 (has links)
Sandy soils are among the least productive soils because of their inability to
store adequate water for plant growth. Their high percolation rate not only allows
water to move quickly beyond the root zone, but also washes nutrients below the reach
of plant roots. High evaporation occurs from the soil surface. Many acres of these
soils around the world are left out of crop production. This study is a contribution to
bring these soils into production by increasing their ability to hold more water in the
root zone. Several promising methods of enhancing these soils were simulated,
surface mulch, buried barrier layer, and a combination of both. The effects of varying
texture and thickness of these layers and varying evaporative demand were
investigated. The impact of such modifications on solute distribution in the soil was
also simulated. A simulation model of water and solute transport in layered soils was
developed for this purpose.
The Richards equation for one-dimensional water transport in unsaturated soils
was modified to account for the water jump between the layers. The solute transport
equation was also modified by implementing the same theory of water infiltration in
layered soil to the solute convective transport. The Crank-Nicolson scheme was used
to solve the transport equations with the help of the Newton-Raphson iteration method.
The results of the simulation show that the proposed methods increase water
content in the sandy soil by up to 45%. The combination of barriers, which decreases
leaching and evaporation was the most effective in conserving water. Most of the
contribution came from the influence of the mulch layer in suppressing water losses by
evaporation. The combination method traps solute in the root zone, and this decreased
solute leaching from the soil may limit plant growth in saline soils. / Graduation date: 1993
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