干旱区生态环境知识资源中心(Arid): Use of remote sensing and long-term in-situ time-series data in an integrated hydrological model of the Central Kalahari Basin, Southern Africa

Arid

DOI	10.1007/s10040-019-01954-9
	Use of remote sensing and long-term in-situ time-series data in an integrated hydrological model of the Central Kalahari Basin, Southern Africa
	Lekula, Moiteela 1,2; Lubczynski, Maciek W.1
通讯作者	Lubczynski, Maciek W.
来源期刊	HYDROGEOLOGY JOURNAL
ISSN	1431-2174
EISSN	1435-0157
出版年	2019
卷号	27 期号:5 页码:1541-1562
英文摘要	Distributed numerical models, considered as optimal tools for groundwater resources management, have always been constrained by availability of spatio-temporal input data. This problem is particularly distinct in arid and semi-arid developing countries, characterized by large spatio-temporal variability of water fluxes but scarce ground-based monitoring networks. That problem can be mitigated by remote sensing (RS) methods, which nowadays are applicable for modelling not only surface-water but also groundwater resources, through rapidly increasing applications of integrated hydrological models (IHMs). This study shows implementation of various RS products in the IHM of the Central Kalahari Basin (similar to 200 Mm(2)) multi-layered aquifer system, characterized by semi-arid climate and thick unsaturated zone, both enhancing evapotranspiration. The MODFLOW-NWT model with UZF1 package, accounting for variably saturated flow, was set up and calibrated in transient conditions throughout 13.5 years using borehole hydraulic heads as state variables and RS-based daily rainfall and potential evapotranspiration as driving forces. Other RS input data included: digital-elevation-model, land-use/land-cover and soils datasets. The model characterized spatio-temporal water flux dynamics, providing 13-year (2002-2014) daily and annual water balances, thereby evaluating groundwater-resource dynamics and replenishment. The balances showed the dominant role of evapotranspiration in restricting gross recharge to only a few mm yr(-1) and typically negative net recharge (median,-1.5 mm yr(-1)), varying from -3.6 (2013) to +3.0 (2006) mm yr(-1) (rainfall of 287 and 664 mm yr(-1) respectively) and implying systematic water-table decline. The rainfall, surface morphology, unsaturated zone thickness and vegetation type/density were primary determinants of the spatio-temporal net recharge distribution.
英文关键词	Groundwater/surface-water interaction Remote sensing Numerical modelling Water balance Namibia Botswana
类型	Article
语种	英语
国家	Netherlands ; Botswana
开放获取类型	hybrid, Green Published
收录类别	SCI-E
WOS记录号	WOS:000475982700002
WOS关键词	ENERGY BALANCE ALGORITHM ; GROUNDWATER RECHARGE ; TREE TRANSPIRATION ; CLIMATE EXPERIMENT ; RICHARDS EQUATION ; SOLUTE TRANSPORT ; SARDON CATCHMENT ; GRAVITY RECOVERY ; SOIL-MOISTURE ; MODFLOW-UZF
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216184
作者单位	1.Univ Twente, Fac Geoinformat Sci & Earth Observat ITC, Dept Water Resources, POB 217, NL-7500 AE Enschede, Netherlands; 2.BIUST, Dept Earth & Environm Sci, Private Bag 16, Botswana, Botswana
推荐引用方式 GB/T 7714	Lekula, Moiteela,Lubczynski, Maciek W.. Use of remote sensing and long-term in-situ time-series data in an integrated hydrological model of the Central Kalahari Basin, Southern Africa[J],2019,27(5):1541-1562.
APA	Lekula, Moiteela,&Lubczynski, Maciek W..(2019).Use of remote sensing and long-term in-situ time-series data in an integrated hydrological model of the Central Kalahari Basin, Southern Africa.HYDROGEOLOGY JOURNAL,27(5),1541-1562.
MLA	Lekula, Moiteela,et al."Use of remote sensing and long-term in-situ time-series data in an integrated hydrological model of the Central Kalahari Basin, Southern Africa".HYDROGEOLOGY JOURNAL 27.5(2019):1541-1562.