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该研究是在欧盟项目EroChiNut框架内实施,其目的是在研究区域内对LISEM土壤侵蚀模型进行验证。研究采用1次小雨和3次中雨共4次降雨过程,并将结果与1次大雨的校定结果相比较。验证结果显示在降雨初期对流量估算过高,而在降雨结束时期又过低。其原因可能是LISEM直接反应于雨强,而测定的流量则滞后。看来小流域犹如一个自然缓冲器,使第一次径流高峰滞后。造成测定和模拟峰值不吻合的另一原因可能是土壤导水率和水压的时空变异性。研究还采用了小雨对LISEM进行验证,如实测值一样,模拟的流量也很小。结果显示在用小雨进行研究时,应考虑量水槽的误差范围。在EroChiNut项目中,其误差范围可以高达6 mm(12 l/s)。同时,量水槽中泥沙淤积问题也是造成测值不准的原因。总的来说如果用相近的降雨过程对LISEM进行校定,其验证结果应更好一些。在该项研究中,如果用中等降雨过程对LISEM进行校定,应该提高验证的准确度。
The study was implemented within the framework of the EU project EroChiNut, which aims to validate the LISEM soil erosion model in the study area. A total of 4 rainfall events were conducted using 1 rain and 3 rainstorms, and the results were compared with those of a heavy rainfall test. The verification showed that the flow rate was estimated too early in the rainfall and too low at the end of the rainfall. The reason may be that LISEM responds directly to rain intensity and the measured flow lags behind. It seems small watershed like a natural buffer, so that the first runoff peak lag. Another reason why the measured peak does not coincide with the simulated peak may be the temporal variability of soil hydraulic conductivity and hydraulic pressure. The study also used light rain to validate LISEM, as the actual measured values, the simulated traffic is also small. The results show that when studying with light rain, the error range of the measuring tank should be considered. In the EroChiNut project, the error range can be up to 6 mm (12 l / s). At the same time, the amount of sediment deposition in the sink is also caused by inaccurate measurements. In general, if LISEM is calibrated with a similar rainfall course, the verification results should be better. In this study, if LISEM was calibrated using a moderate rainfall course, the accuracy of validation should be improved.