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The relationship between soil water behaviour and river runoff: field observations and runoff analyses

机译:土壤水分行为与河流径流的关系:实地观测和径流分析

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Soil water behaviour during rainfall and/or snowmelt events and its role in river runoff is explored by soil moisture measurements and runoff analyses. The soil moisture on the slope in forest and grassland was monitored by 4-channel soil-moisture profilers in the Saromabetsu River Basin, Hokkaido, Japan, in 2008-2010. Corresponding to each rainfall and snowmelt runoff event, the unsaturated layer at 0-30 cm depth in forest stored infiltrated water for a few days after the event, and then returned to the previous moisture level by gradual drainage. The total throughflow (mm) during each rainfall and snowmelt event was calculated by using the soil moisture data, and then was compared with the runoff height (mm) for the direct runoff obtained by the runoff analysis. The relationship between the throughflow and runoff height was definitely linear. This suggests that the simulated direct runoff actually occurs as unsaturated throughflow, a quick flow, in the soil surface layer.
机译:通过土壤湿度测量和径流分析探索了降雨和/或融雪事件期间土壤水分的行为及其在河流径流中的作用。在2008-2010年间,日本北海道Saromabetsu流域的4通道土壤水分剖面仪监测了森林和草地斜坡上的土壤水分。与每个降雨和融雪径流事件相对应,事件后几天,森林中0-30厘米深处的非饱和层将渗入的水储存了几天,然后通过逐步排水恢复到先前的湿度水平。通过使用土壤水分数据计算每个降雨和融雪事件期间的总流量(毫米),然后与通过径流分析获得的直接径流的径流高度(毫米)进行比较。流量与径流高度之间的关系绝对是线性的。这表明,模拟的直接径流实际上是在土壤表层中以不饱和通流,快速流的形式发生的。

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