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通过137Cs技术获得土壤净侵蚀量,并用此值来检验泥沙分布模型所预测得出的沉沙量估计值。137Cs技术的应用需要一个标定过程,以便将测量的137Cs总量转换为土壤净侵蚀率估计值。在种植桉树的卡拉布里亚流域上,用该地1978~1994年的年平均降雨量和沉沙量来检验形态单元和流域范围上SEDD模型的可用性。随后,用质量守恒模型和137Cs总量空间分布模型来获得土壤净侵蚀量估计值。检验质量守衡模型的可靠性是通过比较由137Cs量获得的流域上土壤净侵蚀量和在流域出口处测量的年平均沉沙量来确定。结果证明,无论是在单个的形态单元还是在整个流域范围上,坡地的年平均沉沙量和土壤净侵蚀量之间有很好的一致性,表明了SEDD模型的有效性。
Net soil erosion was obtained by 137Cs technology and was used to test estimates of sediment yield as predicted by the sediment distribution model. The application of 137Cs technology requires a calibration procedure to convert the total amount of 137Cs measured to an estimate of net soil erosion rate. In the Eucalyptus-Calabrian basin, the availability of SEDD models in the form units and watersheds was examined using annual average rainfall and sediment deposition from 1978 to 1994. Subsequently, the estimate of soil net erosion was obtained using the mass conservation model and the 137 Cs total spatial distribution model. The reliability of the model for testing the mass balance was determined by comparing the net soil erosion over the catchment with the amount of 137Cs and the annual average sediment concentration measured at the exit of the catchment. The results show that there is a good agreement between the average annual sediment load of the slope and the net soil erosion amount, both in the single morphological unit and in the whole basin, which shows the validity of the SEDD model.