Arid
DOI10.4314/wsa.v38i2.5
The water balance of a seasonal stream in the semi-arid Western Cape (South Africa)
Bugan, Richard D. H.1,2; Jovanovic, Nebo Z.1; De Clercq, Willem P.2
通讯作者Bugan, Richard D. H.
来源期刊WATER SA
ISSN0378-4738
EISSN1816-7950
出版年2012
卷号38期号:2页码:201-212
英文摘要

A detailed water balance and conceptual flow model was calculated and developed for the Sandspruit catchment for the period 1990 to 2010 on a winter rainfall water-year (1 April - 31 March) basis. The Sandspruit catchment (quaternary catchment G10J) is located in the Western Cape Province of South Africa and is a tributary of the Berg River. It contributes significantly to the salinisation of the mid-to lower-reaches of the Berg River and thus the hydrological drivers need to be quantified and conceptualised in order to develop salinity management strategies. Various components of the water balance, i.e. precipitation, evaporation, streamflow, recharge, etc., were monitored and quantified. In addition, stable environmental isotopes and water balance modelling were used to perform hydrograph separation as well as to quantify components of the water balance. Annual streamflow in the catchment during the period of observation was variable, ranging between 0.026 mm.a(-1) and 75.401 mm.a(-1). Streamflow volumes also exhibit high variability between water years. Catchment annual rainfall varied between 351 and 655 mm.a(-1), averaging at 473 mm.a(-1). On average, 6.5% of rainfall was converted to streamflow during the period of observation. Evapotranspiration was found to be the dominant component of the water balance, as it comprises, on average, 94% of precipitation in the catchment. Groundwater recharge was calculated to average at 29 mm.a(-1). The water balance model (J2000) performed well during the simulation period with all measures of performance exhibiting acceptable values. Simulation results indicate that streamflow is driven by interflow from the soil horizon (94.68% of streamflow), followed by overland flow (4.92% of streamflow). These results, together with the physiographic conditions evident in the catchment, were used to develop a conceptual flow model. Streamflow is interpreted to be driven by quickflow, i.e. overland flow and interflow, with minimal contribution from groundwater, and is also more dependent on the rainfall distribution in time rather than on the annual volume. The correlation between average annual streamflow and average rainfall was observed to be poor, suggesting that alternative factors, e. g. the spatial distribution of winter wheat, the temporal distribution of rainfall, climatic variables (temperature), etc., exert a greater influence on streamflow. The water balance and conceptual flow model will form the basis for the application of distributed hydrological modelling in the Sandspruit catchment and the development of salinity management strategies. Results from this investigation, e. g. ET estimates, methods to quantify groundwater recharge, hydrograph separation, etc., could potentially be extrapolated to other semi-arid areas.


英文关键词Sandspruit River Berg River semi-arid conceptual water balance evapotranspiration hydrological modelling recharge
类型Article
语种英语
国家South Africa
收录类别SCI-E
WOS记录号WOS:000306368200005
WOS关键词GROUNDWATER RECHARGE ; CATCHMENT ; MODEL ; SOIL ; FLOW
WOS类目Water Resources
WOS研究方向Water Resources
来源机构Arizona State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/175302
作者单位1.Council Sci & Ind Res Nat Resources & Environm, ZA-7599 Stellenbosch, South Africa;
2.Stellenbosch Univ Soil Sci, ZA-7602 Matieland, South Africa
推荐引用方式
GB/T 7714
Bugan, Richard D. H.,Jovanovic, Nebo Z.,De Clercq, Willem P.. The water balance of a seasonal stream in the semi-arid Western Cape (South Africa)[J]. Arizona State University,2012,38(2):201-212.
APA Bugan, Richard D. H.,Jovanovic, Nebo Z.,&De Clercq, Willem P..(2012).The water balance of a seasonal stream in the semi-arid Western Cape (South Africa).WATER SA,38(2),201-212.
MLA Bugan, Richard D. H.,et al."The water balance of a seasonal stream in the semi-arid Western Cape (South Africa)".WATER SA 38.2(2012):201-212.
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