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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 123 for “"Water Retention"”.
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Stand Strucuture of Planted Stands in Storm-Water Retention Basins
<p>Trees assist in stormwater retention basin functionality as efficient sources of water removal, and determining stand structure and leaf area of forests can be a measure of their effectiveness. The structure of forest stands on these basins managed for runoff mitigation has received little …
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Coupling of mechanical behaviour and water retention behaviour in unsaturated soils
… has shown coupling of mechanical behaviour and water retention behaviour in unsaturated soils at a constitutive level, with degree of saturation (in addition to suction) influencing mechanical behaviour and volumetric strains influencing water retention behaviour. An innovative elasto-plastic …
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The impact of bacteria on the biophysics of water retention and flow in soil
… in particular the void spaces through which water, gases and solutes flow and in which organisms exist, is vital to a sustainable future on earth. The investigation of the structural behaviour of soil under different influences is fundamental to understanding and protecting the soil. This …
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Quantification of wildfire-induced perturbations to soil-water retention curves and their impact on rainfall runoff
… rates into unsaturated soils. The soil-water retention curve (SWRC), also called the soil-water characteristic curve, is the relationship between matric suction and soil-water content and determines many critical unsaturated soil properties such as unsaturated hydraulic conductivity. The …
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The modification of fuel cell-based breath alcohol sensor materials to improve water retention of sensing performance
… all suffer from a common deficiency: reliance on water. The ability of the fuel cell sensor to manage water content is one of the greatest fundamental challenges facing this technology today. A next-generation fuel cell was designed specifically for sensor testing along with a test station that …
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Characterizing the physical and hydraulic properties of pine bark soilless substrates
… low bulk density, balanced air exchange and water retention, disease resistance, and low pH and salinity. However, improper irrigation of these media can have negative outcomes such as root asphyxia, pathogen development, and reduced plant growth. Understanding pore size distributions, water …
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Assessment of the hatchery kokanee (Oncorhynchus nerka) release program in Lake Roosevelt 2009 -- 2012
… with relatively shallow drawdown and longer water retention times, whereas, the poor 2011 and 2012 returns coincided with a deep drawdown and shorter water retention times.</p>
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Development and Use of Moisture-Suction Relationships for Geosynthetic Clay Liners
… tests, and relative humidity tests, then fitting water retention curves (WRCs) to the data. WRCs were determined for wetting processes and drying processes in terms of gravimetric moisture content and volumetric moisture content.</p> <p>The effects of GCL type, hydration solution, wet-dry cycles, …
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Transient Seepage Analysis for Levees and Dams: Numerical and Monitoring Approaches
… block sensors were used to monitor the pore water pressures in the embankments. It was found that when measuring the field soil water retention, tensiometers were more responsive than porous block sensors at low suctions; although, at shallower depths, the tensiometer performance was limited …
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Experimental and numerical analysis of behaviour of the myxospermous seeds of Capsella bursa-pastoris (L.) Medik. (shepherd’s purse) in soil
… which are capable of absorbing large volumes of water and it has been shown to be of significant ecological importance in terms of seed dormancy, germination and dispersion. However, the effects of the mucilage on the physical properties of soil have not been examined. In this thesis, the …
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An assessment of morphological, physical, chemical, and mineralogical properties of soils derived from volcanic deposits in Rwanda
… extractable aluminum and iron. Phosphate retention is high and varied according to sodium pyrophosphate extractable aluminum and allophane contents. Soil cation exchange capacity, organic C, water retention properties, and aluminum and iron associated with organic matter and allophane …
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Parameter estimation for unsaturated flow models
… the form of spatially and temporally distributed water content and pressure head measurements. The inverse problem is formulated as a weighted least-squares problem. A simple but efficient Levenberg-Marquardt algorithm is developed for its solution. Sensitivity analysis is used to determine …
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Dam dimensions and surface porosity affect the water storage capacity of Beaver dam analogs compared to natural Beaver dams
… restoration strategies. My study compares water retention by Beaver Dam Analogs (BDAs) to natural beaver dams and undammed control reaches. I compared how dam dimensions affect the hydraulic performance of both BDAs and beaver dams, revealing gaps in research on their comparative …
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Benthic Population Distributions in Red Rock Reservoir, Iowa Summer 1972
… of the substrate and bottom meter of water along with water retention time after three years of impoundment. Procedure. Benthic samples were obtained at weekly intervals with a Ponar dredge from two transects of six stations each from June 9 to August 1, 1972. Bottom sediments were …
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Sistema de classificação dos solos baseado na estrutura do espaço poroso
… pore space structure and takes into account the water retention curve. SPSCS was designed according to the textural classification system and it conceives a structural triangle equivalent to the textural triangle. Nine Orders and four Suborders were proposed, resulting in 36 structural Families …
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The influence of bed cover type (gravel vs plastic) on container-grown plants
… canopy temperatures; evapotranspiration, stem water potential, and plant widths were also determined. The objective of Expt. 2 and 3 was to determine the amount of water retained by the container substrate following irrigation and drainage on gravel or plastic bed covers. Pine bark-filled …
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Strictly Concentric Magic Squares
… of a PSCMS of order 6.<br/><br/>The concept of water retention is introduced, rstly on Normal Number Squares, then Prime Number Squares before applying the concept to the minimum PSCMS of order 5. Denitions of patterns are given formally as well as a comparison of known results. Maximum water …
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Atributos físicos e biológicos do solo sob diferentes condições de uso nas várzeas de Sousa (PB)
… and micro porosity, and total porosity, and water retention in the soil, specifically, field capacity, wilting point, and available water. According to the results obtained, it can be seen that the biological part of the overall microbial diversity was larger in the area under native …
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A Study of the Ecological Factors Influencing the Efficiency of the Activated Sludge System for Treating Organic Wastes
A study of the activated sludge process of wastewater treatment was carried out to determine the effect of specific ecological factors on the efficiency of the system. Laboratory and pilot plant tests were employed to determine the effect of changes in plant layout, biomass loading, characteristics …
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