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首页> 外文期刊>Nordic hydrology >Preferential water flow in a glacial till soil
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Preferential water flow in a glacial till soil

机译：冰川耕作土壤中的优先水流

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Measured and simulated response of runoff during snowmelt has suggested that preferential water flow occurs as part of the infiltration process in glacial till. However, only a few quantitative studies have been presented. TDR measurements of soil water content were performed during the growing period in a till slope (7-10%) outside Stockholm. Soil cores were used to determine the water retention curve and the saturated hydraulic conductivity. A physically based one-dimensional model was used to simulate soil water dynamics in the slope. Two simulation approaches were used: a strict one-domain Darcian approach and a two-domain approach accounting for a bypass of the matrix flow system. The measured response of soil water content occurred within the first few hours after rainfall. This was best represented by the two-domain approach, while the response for the one-domain approach was significantly delayed with time and depth. The general behaviour of the soil water content throughout the season was, however, best simulated with a one-domain approach. The results indicated that preferential flow patterns through the unsaturated zone does not need to be considered to describe the seasonal pattern in glacial till soil. However, the results also point out that the purpose of the simulation is decisive when choosing a simulation approach, depending on whether the general soil water content over the season or the instant behaviour immediately after rainfall is of major interest.
机译：对融雪期间径流的测量和模拟响应表明，在冰川耕地中，优先的水流是渗透过程的一部分。但是，仅提出了一些定量研究。在生长期，在斯德哥尔摩郊外的耕作坡度（7-10％）中进行了土壤水分含量的TDR测量。用土芯确定保水曲线和饱和水力传导率。使用基于物理的一维模型来模拟斜坡中的土壤水分动力学。使用了两种模拟方法：严格的单域Darcian方法和考虑了矩阵流系统旁路的两域方法。在降雨后的最初几个小时内，对土壤水分的响应进行了测量。这最好用两域方法来表示，而单域方法的响应随时间和深度而显着延迟。然而，整个季节中土壤水分的一般行为最好采用单域方法进行模拟。结果表明，不需要考虑通过非饱和带的优先流动模式来描述冰川耕作土壤的季节模式。但是，结果还指出，选择模拟方法时，模拟的目的是决定性的，具体取决于整个季节的总体土壤水分含量或降雨后立即的即时行为。

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