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首页> 外文期刊>Hydrology and Earth System Sciences >Vectors of subsurface stormflow in a layered hillslope during runoff initiation
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Vectors of subsurface stormflow in a layered hillslope during runoff initiation

机译：径流启动过程中层状坡面地下暴雨矢量

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The focus is the experimental assessment of in-situ flow vectors in ahillslope soil. We selected a 100 m2 trenched hillslope study site.During prescribed sprinkling an obliquely installed TDR wave-guide providesfor the velocity of the wetting front in its direction. A triplet ofwave-guides mounted along the sides of an hypothetical tetrahedron, with itspeak pointing down, produces a three-dimensional vector of the wettingfront. The method is based on the passing of wetting fronts. We analysed 34vectors along the hillslope at distributed locations and at soil depths from11 cm (representing top soil) to 40 cm (close to bedrock interface). Themean values resulted as follows vx=16.1 mm min-1, vy=-0.2 mm min-1,and vz=11.9 mm min-1. The velocity vectors of thewetting fronts were generally gravity dominated and downslope orientated.Downslope direction (x-axis) dominated close to bedrock, whereas nopreference between vertical and downslope direction was found in vectorsclose to the surface. The velocities along the contours (y-axis) variedwidely. The Kruskal-Wallis tests indicated that the different upslopesprinkling areas had no influence on the orientation of the vectors. Vectorsof volume flux density were also calculated for each triplet. The lateralvelocities of the vector approach are compared with subsurface stromflowcollected at the downhill end of the slope. Velocities were 25-140 timesslower than lateral saturated tracer movements on top of the bedrock. Besideother points, we conclude that this method is restricted to non-complexsubstrate (skeleton or portion of big stones).
机译：重点是在坡地土壤中原位流向的实验评估。我们选择了一个100 m 2 开槽的山坡研究点。在规定的洒水量下，倾斜安装的TDR波导可提供润湿前沿在其方向上的速度。沿着假想的四面体的侧面安装的三重波导，其峰顶朝下，产生了润湿前沿的三维矢量。该方法基于润湿前沿的通过。我们分析了沿山坡分布的位置和土壤深度从11 cm（代表表层土壤）到40 cm（接近基岩界面）的34个向量。主题值如下： v x = 16.1 mm min -1 ， v < /b>y=-0.2 mm min -1 和 v z = 11.9毫米（最小） -1 。湿润锋面的速度矢量通常以重力为主导，并以下坡为导向，下坡方向（x轴）在基岩附近占主导地位，而垂直和下坡方向在靠近地面的矢量中没有优先选择。沿轮廓线（y轴）的速度变化很大。 Kruskal-Wallis测试表明，不同的上坡洒水区域对矢量的方向没有影响。还为每个三元组计算了体积通量密度的向量。将矢量方法的横向速度与在斜坡下坡端收集的地下地层流进行比较。速度比基岩顶部的横向饱和示踪剂运动慢25-140倍。除其他观点外，我们得出的结论是，该方法仅限于非复杂基质（骨骼或大块石头的一部分）。

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