TITLE

Groundwater as an emergency source for drought mitigation in the Crocodile River catchment, South Africa

AUTHOR(S)
Mussá, F. E. F.; Zhou, Y.; Maskey, S.; Masih, I.; Uhlenbrook, S.
PUB. DATE
February 2015
SOURCE
Hydrology & Earth System Sciences;2015, Vol. 19 Issue 2, p1093
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Global climate change has received much attention worldwide in the scientific as well as in the political community, indicating that changes in precipitation, extreme droughts and floods may increasingly threaten many regions. Drought is a natural phenomenon that causes social, economical and environmental damage to society. In this study, we assess the drought intensity and severity and the groundwater potential to be used as a supplementary source of water to mitigate drought impacts in the Crocodile River catchment, a water-stressed sub-catchment of the Incomati River catchment in South Africa. The research methodology consists of three parts. First, the spatial and temporal variation of the meteorological and hydrological drought severity and intensity over the catchment were evaluated. The Standardized Precipitation Index (SPI) was used to analyse the meteorological drought and the Standardized Runoff Index (SRI) was used for the hydrological drought. Second, the water deficit in the catchment during the drought period was computed using a simple water balance method. Finally, a groundwater model was constructed in order to assess the feasibility of using groundwater as an emergency source for drought impact mitigation. Results show that the low-rainfall areas are more vulnerable to severe meteorological droughts (lower and upper crocodile). Moreover, the most water stressed subcatchments with high level of water uses but limited storage, such as the Kaap located in the middle catchment and the Lower Crocodile sub-catchments, are more vulnerable to severe hydrological droughts. The analysis of the potential groundwater use during droughts showed that a deficit of 97Mm³ yr-1 could be supplied from groundwater without considerable adverse impacts on the river base flow and groundwater storage. Abstraction simulations for different scenarios of extremely severe droughts reveal that it is possible to use groundwater to cope with the droughts in the catchment. However, local groundwater exploitation in Nelspruit and White River sub-catchment will cause large drawdowns (> 10 m) and high base flow reduction (> 20 %). This case study shows that conjunctive water management of groundwater and surface water resources is necessary to mitigate the impacts of droughts.
ACCESSION #
101351761

 

Related Articles

  • Monitoring Drought Conditions and Their Uncertainties in Africa Using TRMM Data. Naumann, G.; Barbosa, P.; Carrao, H.; Singleton, A.; Vogt, J. // Journal of Applied Meteorology & Climatology;Oct2012, Vol. 51 Issue 10, p1867 

    The main objective of this study is to evaluate the uncertainties due to sample size associated with the estimation of the standardized precipitation index (SPI) and their impact on the level of confidence in drought monitoring in Africa using high-spatial-resolution data from short time series....

  • Water Table Depth Tied to Droughts.  // National Driller;Nov2008, Vol. 29 Issue 11, p67 

    The article discusses the correlation between the water depth table and drought in Great Plains. It states that the recent modelling show that the depth of the water table determines the relative susceptibility of regions to changes in temperature and precipitation. According to Reed Maxwell, an...

  • Cumulative drought effect on Figeh karstic spring discharge (Damascus basin, Syria). Zakhem, Boulos; Kattaa, Bassam // Environmental Earth Sciences;Jan2016, Vol. 75 Issue 2, p1 

    The effects of climate changes are being strongly perceived in the studied area as in the rest of the Mediterranean basin, and groundwater resources are obviously affected. In this paper, Figeh karst spring discharge and precipitation in Damascus basin were analyzed by normalized methods on a...

  • Morphometric and chemical response of two contrasting lake systems to modern climate change. Jovanelly, Tamie J.; Fritz, Sherilyn C. // Journal of Paleolimnology;Jun2011, Vol. 46 Issue 1, p89 

    Observational data on the response of lakes during modern-day periods of abundant precipitation and drought may provide analogs for Holocene stratigraphic records and help elucidate the mechanisms that influence how lakes integrate climate. This study evaluated the impacts of climatic variation...

  • Mapping Weather-Type Influence on Senegal Precipitation Based on a Spatial-Temporal Statistical Model*. Rust, Henning W.; Vrac, Mathieu; Sultan, Benjamin; Lengaigne, Matthieu // Journal of Climate;Oct2013, Vol. 26 Issue 20, p8189 

    Senegal is particularly vulnerable to precipitation variability. To investigate the influence of large-scale circulation on local-scale precipitation, a full spatial-statistical description of precipitation occurrence and amount for Senegal is developed. These regression-type models have been...

  • Seasonal precipitation reconstruction and teleconnections with ENSO based on tree ring analysis of Pinus cooperi. Pompa-García, Marín; Jurado, Enrique // Theoretical & Applied Climatology;Aug2014, Vol. 117 Issue 3-4, p495 

    Tendencies of climatic variability indicate that northern Mexico will soon suffer from severe drought. Modeling the influence of climate and ecological processes would help researchers better understand the future implication of climatic variations. Here, we reconstructed historical seasonal...

  • Temporal-Spatial Variation of Drought Indicated by SPI and SPEI in Ningxia Hui Autonomous Region, China. Chunping Tan; Jianping Yang; Man Li // Atmosphere;2015, Vol. 6 Issue 10, p1399 

    The Ningxia Hui Autonomous Region of China (Ningxia) is an important food production area in northwest China severely affected by drought. The Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI) were calculated based on monthly meteorological...

  • MAXIMUM NUMBER OF CONSECUTIVE DAYS WITH PRECIPITATION OVER BULGARIA AND THE CORRESPONDING SYNOPTIC SITUATIONS. Gocheva, Anelia; Trifonova, Lyubov; Malcheva, Krastina // Proceedings of the International Multidisciplinary Scientific Ge;2011, Vol. 2, p925 

    Daily precipitation data measured in 38 meteorological stations during all months of the year in the period (1960 - 2009) are sorted looking for consecutive days with precipitation. The used 38 points are approximately uniformly located on the territory of the country (19 in North Bulgaria and...

  • Estimation of Variability Characteristics of Regional Drought during 1964-2013 in Horqin Sandy Land, China. Yongfang Wang; Jiquan Zhang; Enliang Guo; Zhenhua Dong; Lai Quan // Water (20734441);Nov2016, Vol. 8 Issue 11, p543 

    Drought has an important influence on the hydrological cycle, ecological system, industrial and agricultural production, and social life. Based on the different time scales of characteristics of drought variability, the standardized precipitation evapotranspiration index (SPEI), a...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics