Application of an optical disdrometer to characterize simulated rainfall and measure drop-size distribution     

Derege Tsegaye Meshesha  Atsushi Tsunekawa  Nigussie Haregeweyen 《水文科学杂志》2013,58(10):1574-1587

ABSTRACT

Knowledge of rainfall characteristics such as drop-size distribution is essential for the development of erosion-mitigation strategies and models. This research used an optical disdrometer to elucidate the relationships between raindrop-size distribution, median volume drop diameter (D₅₀), kinetic energy and radar reflectivity (dBz) of simulated rainfall of different intensities. The D₅₀ values were higher for the simulated rain than for natural rain at almost all rainfall intensities, perhaps due to variations in rainfall types and the turbulence in natural rain that breaks up large drops. The kinetic energy ranged from 26.67 to 5955.51 J m^?2 h ^?1, while the median volume drop diameter (D₅₀) was in the range 1.94–7.25 mm, for intensities between 1.5 and 202.6 mm h^?1. The relationship between radar reflectivity (Z) and the intensity (R) of the simulated rain was best described by a power law function (Z = aR^b), with a and b coefficients in the ranges 162–706 and 0.94–2.46, respectively, throughout the range of rainfall intensities (1.5–202.6 mm h^?1).  相似文献   

Model parameter transfer for streamflow and sediment loss prediction with SWAT in a tropical watershed     

Vincent Roth  Tibebu Kassawmar Nigussie  Tatenda Lemann 《Environmental Earth Sciences》2016,75(19):1321

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Dynamics and hotspots of soil erosion and management scenarios of the Central Rift Valley of Ethiopia     

Derege Tsegaye MESHESHA  Atsushi TSUNEKAWA  Mitsuru TSUBO  Nigussie HAREGEWEYN 《国际泥沙研究》2012,27(1):84-99

Most of the lowland in the central rift valley of Ethiopia is arid or semiarid and in degradation,with frequent occurrence of droughts.Soil erosion by water during the rainy season is a serious problem...  相似文献