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首页> 外文期刊>Berichte des Meteorologischen Institutes der Universitat Freiburg >A wind tunnel study of aeolian sediment transport and PM_(10) emissionin grass canopies of different planting densities
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A wind tunnel study of aeolian sediment transport and PM_(10) emissionin grass canopies of different planting densities

机译：不同种植密度下草冠层风沙沉积和PM_（10）排放的风洞研究

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In this study, wind tunnel experiments were performed with the grass species Lolium perenneplanted in quartz sand. Sediment transport and PM_(10)emission were studied in four levels ofcanopy density with nominal plant coverages Cv = 55%, 15%, 3% and 0% and correspondingfrontal area indices X = 0.42, 0.11, 0.02 and 0, respectively. Both total sediment mass flux andPM ,0 emission decreased approximately exponentially with increasing plant cover. It was alsofound that vegetation profoundly changed the characteristics of vertical sediment flux profiles,with decreasing flux fractions near the ground in denser plant canopies. Spatial and temporalinformation on typical erosion and deposition patterns within the plant canopies were gained byusing coloured quartz sand. The normalised friction velocities (tWU6) showed a maximum formedium values of X, indicating a change from the wake interference to the skimming flow re-gime.
机译：在这项研究中，风洞实验是用草种多年生黑麦草种植在石英砂中进行的。研究了4种冠层密度水平下的泥沙运移和PM_（10）排放，标称植物覆盖率Cv = 55％，15％，3％和0％，相应的额叶面积指数X = 0.42、0.11、0.02和0。随着植物覆盖率的增加，总的泥沙质量通量和PM，0排放均呈指数下降。研究还发现，在密度较大的植物冠层中，植被极大地改变了垂直沉积物通量剖面的特征，同时降低了地面附近通量分数。利用彩色石英砂获得了植物冠层典型侵蚀和沉积方式的时空信息。归一化的摩擦速度（tWU6）的最大成形值为X，表明从尾流干扰到脱脂流动胶体的变化。

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