Isotopic tracing of stormwater in the urban Liesbeek River

被引:1
|
作者
van Mazijk, Ruan [1 ]
Smyth, Lucy K. [1 ,2 ]
Weideman, Eleanor A. [1 ,3 ]
West, Adam G. [1 ]
机构
[1] Univ Cape Town, Dept Biol Sci, Rondebosch, South Africa
[2] Univ CapeTown, Inst Communities & Wildlife Africa iCWild, Rondebosch, South Africa
[3] Univ Cape Town, FitzPatrick Inst African Ornithol, Rondebosch, South Africa
关键词
stable isotopes; urban water management; water resources; urban rivers; RATIO INFRARED-SPECTROSCOPY; RING-DOWN SPECTROSCOPY; CLIMATE-CHANGE; SOUTHWESTERN CAPE; MASS-SPECTROMETRY; WATER; GROUNDWATER; SOIL; URBANIZATION; RESOURCES;
D O I
10.4314/wsa.v44i4.16
中图分类号
TV21 [水资源调查与水利规划];
学科分类号
081501 ;
摘要
The ongoing drought in the Western Cape of South Africa (2014 to present) has called for an urgent need to improve our understanding of water resources in the area. Rivers within the Western Cape are known to surge rapidly after rainfall events. Such storm-flow in natural river catchments in the Jonkershoek mountains has previously been shown to be driven by displaced groundwater, with less than 5% of rainfall appearing in the storm-flow. However, the origin of storm-flow surges within urban rivers in the region remains unknown. In this study, we used stable isotopes in water to illustrate that at least 90% of water in the Liesbeek River during a storm event was rainwater. There was a strong correlation between storm-flow and rainfall rates (P < 0.001, Pearson's r = 0.86), as well as between the delta O-18 and delta H-2 values of river-water and rainwater (delta O-18: Pearson's r = 0.741 (P = 0.001), delta H-2: Pearson's r = 0.775 (P < 0.001)). Storm-flow within this urban river therefore appears to be driven by overland-flow over the hardened urban catchment, rather than piston-flow as seen in natural catchments. Our results support studies suggesting the Liesbeek River could be a target for stormwater harvesting to augment water resources in the city of Cape Town.
引用
收藏
页码:674 / 679
页数:6
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