干旱区生态环境知识资源中心(Arid): Groundwater-surface water interactions in an ephemeral savanna catchment, Kruger National Park

Arid

DOI	10.4102/koedoe.v62i2.1583
	Groundwater-surface water interactions in an ephemeral savanna catchment, Kruger National Park
	Riddell, Edward S.; Nel, Jaco; van Tol, Johan; Fundisi, Daniel; Jumbi, Faith; van Niekerk, Ashton; Lorentz, Simon
通讯作者	Riddell, ES
来源期刊	KOEDOE
ISSN	0075-6458
EISSN	2071-0771
出版年	2020
卷号	62 期号:2
英文摘要	The semi-arid conditions in savanna landscapes ensure that ephemeral drainage dominates the hydrological network in these dryland systems. Quantification of their hydrological processes is important to inform ecosystem understanding and future conservation efforts under a changing climate, and to provide guidance for restoration. By combining in situ hydrometric observations, hydrochemistry, remote sensing and a soil water balance model, we characterise the groundwater-surface water interactions in ephemeral low-order catchments of the granitoid regions of the southern Kruger National Park (KNP). Streams at the lowest orders are augmented by lateral interflows from the catena, although the second-and third-order stream reaches are conduits for groundwater recharge to the fractured rock aquifer; the soils of the crests and foot-slopes also show preferential flow, and are truly recharge soils, whilst the duplex soils of the midslopes clearly show their responsive nature to a low soil moisture deficit in the shallow horizons. Actual evaporation (aET) differed between catena elements with surprisingly little variation at third-order hillslopes, with the greatest overall aET at the first order. Meanwhile, soil water balances demonstrated a significant variation in storage of the riparian zones as a result of interflow from upslope and aET losses. Furthermore, data support broader-scale observations that groundwater recharge through the vadose zone to the fractured rock aquifer is dependent upon threshold antecedent precipitation conditions. Moderate precipitation events (5 mm/day - 35 mm/day) over a 2-3 week period initiate groundwater responses with a 2-3 month lag, whilst intense precipitation events (>100 mm/day) are expressed within 2-3 weeks.
英文关键词	Flow processes Groundwater recharge Actual evapotranspiration Ephemeral Granitic catchments Savannas
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000588720200001
WOS关键词	AFRICAN ; DISCHARGE
WOS类目	Biodiversity Conservation ; Biology
WOS研究方向	Biodiversity & Conservation ; Life Sciences & Biomedicine - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327470
作者单位	[Riddell, Edward S.] South African Natl Pk, Conservat Management, Skukuza, South Africa; [Riddell, Edward S.; Fundisi, Daniel; Jumbi, Faith; Lorentz, Simon] Univ KwaZulu Natal, Ctr Water Resources Res, Pietermaritzburg, South Africa; [Nel, Jaco; van Niekerk, Ashton] Univ Western Cape, Inst Water Studies, Cape Town, South Africa; [Nel, Jaco] Groundwater Consulting Serv, Pretoria, South Africa; [van Tol, Johan] Univ Free State, Fac Sci & Agr, Dept Soil Crop & Climate Sci, Bloemfontein, South Africa; [Fundisi, Daniel] Digby Wells Environm Pty Ltd, Johannesburg, South Africa; [Jumbi, Faith] Univ Western Cape, Fac Nat Sci, Dept Earth Sci, Cape Town, South Africa; [van Niekerk, Ashton] Univ Western Cape, Dept Human Settlements Water & Sanitat, Cape Town, South Africa; [Lorentz, Simon] SRK Consulting, Pietermaritzburg, South Africa
推荐引用方式 GB/T 7714	Riddell, Edward S.,Nel, Jaco,van Tol, Johan,et al. Groundwater-surface water interactions in an ephemeral savanna catchment, Kruger National Park[J],2020,62(2).
APA	Riddell, Edward S..,Nel, Jaco.,van Tol, Johan.,Fundisi, Daniel.,Jumbi, Faith.,...&Lorentz, Simon.(2020).Groundwater-surface water interactions in an ephemeral savanna catchment, Kruger National Park.KOEDOE,62(2).
MLA	Riddell, Edward S.,et al."Groundwater-surface water interactions in an ephemeral savanna catchment, Kruger National Park".KOEDOE 62.2(2020).