干旱区生态环境知识资源中心(Arid): Quantifying and understanding the source of recharge for alluvial systems in arid environments through the development of a seepage model

Arid

DOI	10.1016/j.jhydrol.2021.126650
	Quantifying and understanding the source of recharge for alluvial systems in arid environments through the development of a seepage model
	Watson, Andrew; Kralisch, Sven; van Rooyen, Jared; Miller, Jodie
通讯作者	Watson, A (corresponding author), Stellenbosch Univ, Dept Earth Sci, Private Bag X1, ZA-7602 Matieland, South Africa.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	601
英文摘要	In rural settings, groundwater is often the most utilised freshwater resource and can be subject to a number of factors that impact its availability and distribution. River seepage plays an important role in recharging alluvial groundwater systems, especially for arid environments where ephemeral rivers dominate. In this study, a river seepage component was developed for a spatially distributed rainfall/runoff model, the J2000 model. To represent river seepage, physical channel properties such as channel width, slope, length as well as a lumped riverbed hydraulic conductivity under 'dry' and 'wet' conditions were used. To facilitate and account for enhanced evapotranspiration in the alluvial channel, seepage firstly satisfied the potential evaporation demand and thereafter contributed to simulated recharge. The results show that by accounting for seepage, observed low flows were well simulated (Log E2: 0.74). Although, the input precipitation data and quality of the measured precipitation was associated with a high uncertainty and further impacted by a change in station density between the headwater and valley region (3 times higher in the headwaters). As a result, peak flows were less well represented (E2: 0.39) and a second downstream calibration was not possible. On average, river/reach seepage was estimated to be 8 mm d(-1), where 150-300 mm yr(-1) of seepage was simulated during wet years, exceeding simulated percolation on a reach level and a significant source over the catchment area. Given streamflow only comprised 1.3% of the total water balance, the efficiencies attained by this approach were good considering the extremely harsh climatic conditions. This approach is likely transferable to other arid environments and rivers with intermittent flow, where river seepage may be overlooked as an important contributor to hydrological functioning.
英文关键词	River seepage Rainfall/runoff modelling Distributed J2000 model Arid environments
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000695816300064
WOS关键词	TRANSMISSION LOSSES ; GROUNDWATER RECHARGE ; AQUIFER RECHARGE ; SURFACE-WATER ; WEST-COAST ; RAINFALL ; INFILTRATION ; RIVER ; NAMAQUALAND ; SENSITIVITY
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368408
作者单位	[Watson, Andrew; van Rooyen, Jared; Miller, Jodie] Stellenbosch Univ, Dept Earth Sci, Private Bag X1, ZA-7602 Matieland, South Africa; [Kralisch, Sven] Friedrich Schiller Univ Jena, Dept Geoinformat Sci, Loebdergraben 32, D-07743 Jena, Germany; [Kralisch, Sven] German Aerosp Ctr DLR, Inst Data Sci, Maelzerstr 3, D-07745 Jena, Germany
推荐引用方式 GB/T 7714	Watson, Andrew,Kralisch, Sven,van Rooyen, Jared,et al. Quantifying and understanding the source of recharge for alluvial systems in arid environments through the development of a seepage model[J],2021,601.
APA	Watson, Andrew,Kralisch, Sven,van Rooyen, Jared,&Miller, Jodie.(2021).Quantifying and understanding the source of recharge for alluvial systems in arid environments through the development of a seepage model.JOURNAL OF HYDROLOGY,601.
MLA	Watson, Andrew,et al."Quantifying and understanding the source of recharge for alluvial systems in arid environments through the development of a seepage model".JOURNAL OF HYDROLOGY 601(2021).