基于卫星的降水量估算是了解和预测区域或全球尺度水文过程的重要信息来源。鉴于这些估计的准确性和可靠性的潜在可变性,在特定的水文环境中应用之前,全面的绩效评估是必不可少的。在这项研究中,六个基于卫星的降水产品(SPPs),即,CHIRPS,CMORPH,GSMaP,IMERG,MSWEP,和PERSIANN,评估了它们在水文建模中的实用性,特别是在使用可变渗透能力(VIC)模型模拟水流时。采用统计指标评估了VIC模型在不同流动条件和时间尺度下的性能,viz.,R2,KGE,PBias,RMSE,和RSR。研究结果证明了VIC模型在模拟水文成分方面的有效性及其在评估SPP的准确性和可靠性方面的适用性。SPPs被证明对每月和每日时间尺度的水流模拟是有价值的。正如各种绩效指标所证实的那样。此外,SPPs模拟极端流量事件的性能(流量超过75%,90%,和95%)使用VIC模型进行了评估,对于高流量事件,观察到性能显着下降。比较分析揭示了IMERG和CMORPH在每日时间尺度和高流量条件下的流量模拟中的优越性。相比之下,发现CHIRPS和PERSIANN的性能较差。这项研究强调了在模拟各种流动条件时彻底评估SPPs的重要性。
Satellite-based precipitation estimates are a critical source of information for understanding and predicting hydrological processes at regional or global scales. Given the potential variability in the accuracy and reliability of these estimates, comprehensive performance assessments are essential before their application in specific hydrological contexts. In this study, six satellite-based precipitation products (SPPs), namely, CHIRPS, CMORPH, GSMaP, IMERG, MSWEP, and PERSIANN, were evaluated for their utility in hydrological modeling, specifically in simulating streamflow using the Variable Infiltration Capacity (VIC) model. The performance of the VIC model under varying flow conditions and timescales was assessed using statistical indicators, viz., R2, KGE, PBias, RMSE, and RSR. The findings of the study demonstrate the effectiveness of VIC model in simulating hydrological components and its applicability in evaluating the accuracy and reliability of SPPs. The SPPs were shown to be valuable for streamflow simulation at monthly and daily timescales, as confirmed by various performance measures. Moreover, the performance of SPPs for simulating extreme flow events (streamflow above 75%, 90%, and 95%) using the VIC model was assessed and a significant decrease in the performance was observed for high-flow events. Comparative analysis revealed the superiority of IMERG and CMORPH for streamflow simulation at daily timescale and high-flow conditions. In contrast, the performances of CHIRPS and PERSIANN were found to be poor. This study highlights the importance of thoroughly assessing the SPPs in modeling diverse flow conditions.