Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 1474-7065 |
EISSN | 1873-5193 |
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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