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Accueil du site → Master → Etats Unis → 1983 → EROSION AND RUNOFF FROM SODIUM DISPERSED, COMPACTED EARTH WATER HARVESTING CATCHMENTS

University of Arizona (1983)

EROSION AND RUNOFF FROM SODIUM DISPERSED, COMPACTED EARTH WATER HARVESTING CATCHMENTS

Evett, Steven Roy

Titre : EROSION AND RUNOFF FROM SODIUM DISPERSED, COMPACTED EARTH WATER HARVESTING CATCHMENTS

Auteur : Evett, Steven Roy

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1983

Résumé
Sixteen water harvesting runoff plots, involving duplicates of all combinations of 1, 5, 10, and 15% slopes and 3 and 6 meter lengths, were built on a gravelly sandy clay loam using 11.2 ton/ha of NaCl mixed into the surface 2 to 5 centimeters of the soil ; and, compaction with a 6-ton roller after a heavy rain. Equations characterizing the runoff-rainfall relationship were 2 developed for catchments of different slopes and lengths. The r values were 0.96 or better for 11 runoff events. Tentative equations predicting runoff efficiency and runoff ratio in terms of plot slope and length were developed. The universal soil loss equation, USLE, was best fitted to the data by removing the length factor and modifying the slope steepness factor. Runoff water presented slight or no salinity problem, but a slight to moderate permeability problem according to FAO criteria for irrigation waters.

Mots clés : Erosion. ; Reservoirs. ; Runoff. ; Soils, Salts in. ; Soils — Sodium content. ; Water — Storage.

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Page publiée le 4 février 2016, mise à jour le 16 février 2018