基于CHIRPS的卫星降雨量估计对南非的适用性

IF 0.4 4区工程技术 Q4 ENGINEERING, CIVIL

Journal of the South African Institution of Civil Engineering Pub Date : 2021-11-11 DOI:10.17159/2309-8775/2021/v63n3a4

J. A. Du Plessis, J. K. Kibii

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引用次数: 8

摘要

具有良好时空分布的长期降雨数据对于所有气候相关分析都是必不可少的。由于降雨量报告和(或)质量控制有限，以及在某些情况下这些站点关闭，造成雨量观测站网络有限和日益恶化，因此多年来观测到的雨量数据的可得性越来越成问题。基于遥感卫星的降雨数据集提供了另一种信息来源。在这项研究中，将来自气候危害组红外降水(CHIRPS)的日和月降雨量数据与均匀分布在南非各地的46个站点的观测降雨量数据进行了比较。基于观测数据和CHIRPS数据的两两比较，应用各种指标来评估CHIRPS在估计日和月降雨量方面的性能。结果表明，CHIRPS数据与所有站点的月降水观测数据具有良好的相关性，平均决定系数为0.6，偏差为0.95。本研究的结论是，与观测到的月度降雨量数据相比，每月CHIRPS数据对应良好，精度高，偏差相对较小，因此可以考虑将其与观测到的降雨量数据结合使用，在南非没有或有限的数据可用于水文分析。

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Applicability of CHIRPS-based satellite rainfall estimates for South Africa

Long-term rainfall data with good spatial and temporal distribution is essential for all climate-related analyses. The availability of observed rainfall data has become increasingly problematic over the years due to a limited and deteriorating rainfall station network, occasioned by limited reporting and/or quality control of rainfall and, in some cases, closure of these stations. Remotely sensed satellite-based rainfall data sets offer an alternative source of information. In this study, daily and monthly rainfall data derived from Climate Hazards Group InfraRed Precipitation (CHIRPS) is compared with observed rainfall data from 46 stations evenly distributed across South Africa. Various metrics, based on a pairwise comparison between the observed and CHIRPS data, were applied to evaluate CHIRPS performance in the estimation of daily and monthly rainfall. The results show that CHIRPS data correlate well with observed monthly rainfall data for all stations used, having an average coefficient of determination of 0.6 and bias of 0.95. This study concludes that monthly CHIRPS data corresponds well, with good precision and relatively little bias when compared to observed monthly rainfall data, and can therefore be considered for use in conjunction with observed rainfall data where no or limited data is available in South Africa for hydrological analysis.

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来源期刊

Journal of the South African Institution of Civil Engineering 工程技术-工程：土木

CiteScore

0.70

自引率

25.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of the South African Institution of Civil Engineering publishes peer reviewed papers on all aspects of Civil Engineering relevant to Africa. It is an open access, ISI accredited journal, providing authoritative information not only on current developments, but also – through its back issues – giving access to data on established practices and the construction of existing infrastructure. It is published quarterly and is controlled by a Journal Editorial Panel. The forerunner of the South African Institution of Civil Engineering was established in 1903 as a learned society aiming to develop technology and to share knowledge for the development of the day. The minutes of the proceedings of the then Cape Society of Civil Engineers mainly contained technical papers presented at the Society''s meetings. Since then, and throughout its long history, during which time it has undergone several name changes, the organisation has continued to publish technical papers in its monthly publication (magazine), until 1993 when it created a separate journal for the publication of technical papers.