Abstract
Field experimental studies on surge flow irrigation with sediment-laden water in northwestern China showed that a sealing layer was formed on the soil surface as a result of the sediments in the irrigation water going through a ‘trapping’, ‘settling’ and ‘sealing’ processes in the irrigated field. The sealing layer reduced the surface roughness and intake rate of the surface soil, and thus sped up the flow advance. Therefore, higher irrigation efficiency can be achieved with less irrigation water requirement. Analytical studies on water saving efficiencies indicated that the water saving effect of surge irrigation with sediment-laden water was achieved by an interactive impact of sediment content and the intermittent feature of surge flow, but the sediments effect was more pronounced.
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