Arid
DOI10.1016/j.pce.2017.02.009
Evaluation of satellite and simulated rainfall products for hydrological applications in the Notwane catchment, Botswana
Kenabatho, P. K.1; Parida, B. P.2; Moalafhi, D. B.1,3
通讯作者Kenabatho, P. K.
来源期刊PHYSICS AND CHEMISTRY OF THE EARTH
ISSN1474-7065
EISSN1873-5193
出版年2017
卷号100页码:19-30
英文摘要

In semi-arid catchments, hydrological modeling, water resources planning and management are hampered by insufficient spatial rainfall data which is usually derived from limited rain gauge networks. Satellite products are potential candidates to augment the limited spatial rainfall data in these areas. In this paper, the utility of the Tropical Rainfall Measuring Mission (TRMM) product (3B42 v7) is evaluated using data from the Notwane catchment in Botswana. In addition, rainfall simulations obtained from a multi-site stochastic rainfall model based on the generalised linear models (GLMs) were used as additional spatial rainfall estimates. These rainfall products were compared to the observed rainfall data obtained from six (6) rainfall stations available in the catchment for the period 1998-2012. The results show that in general the two approaches produce reasonable spatial rainfall estimates. However, the TRMM products provided better spatial rainfall estimates compared to the GLM rainfall outputs on an average, as more than 90% of the monthly rainfall variations were explained by the TRMM compared to 80% from the GLMs. However, there is still uncertainty associated mainly with limited rainfall stations, and the inability of the two products to capture unusually high rainfall values in the data sets. Despite this observation, rainfall indices computed to further assess the daily rainfall products (i.e. rainfall occurrence and amounts, length of dry spells) were adequately represented by the TRMM data compared to the GLMs. Performance from the GLMs is expected to improve with addition of further rainfall predictors. A combination of these rainfall products allows for reasonable spatial rainfall estimates and temporal (short term future) rainfall simulations from the TRMM and GLMs, respectively. The results have significant implications on water resources planning and management in the catchment which has, for the past three years, been experiencing prolonged droughts as shown by the drying of Gaborone dam (currently at a record low of 1.6% full), which is the main source of water supply to the city of Gaborone and neighbouring townships in Botswana. (C) 2017 Elsevier Ltd. All rights reserved.


英文关键词Tropical rainfall measuring mission Generalised linear models Semi-arid areas Rainfall predictors
类型Article
语种英语
国家Botswana ; Australia
收录类别SCI-E
WOS记录号WOS:000412251700004
WOS关键词PASSIVE MICROWAVE ; MODEL
WOS类目Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS研究方向Geology ; Meteorology & Atmospheric Sciences ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/201459
作者单位1.Univ Botswana, Dept Environm Sci, P Bag 00704, Gaborone, Botswana;
2.Univ Botswana, Dept Civil Engn, P Bag 0061, Gaborone, Botswana;
3.Univ New South Wales, Sch Civil & Environm Engn, Sydney, NSW, Australia
推荐引用方式
GB/T 7714
Kenabatho, P. K.,Parida, B. P.,Moalafhi, D. B.. Evaluation of satellite and simulated rainfall products for hydrological applications in the Notwane catchment, Botswana[J],2017,100:19-30.
APA Kenabatho, P. K.,Parida, B. P.,&Moalafhi, D. B..(2017).Evaluation of satellite and simulated rainfall products for hydrological applications in the Notwane catchment, Botswana.PHYSICS AND CHEMISTRY OF THE EARTH,100,19-30.
MLA Kenabatho, P. K.,et al."Evaluation of satellite and simulated rainfall products for hydrological applications in the Notwane catchment, Botswana".PHYSICS AND CHEMISTRY OF THE EARTH 100(2017):19-30.
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