干旱区生态环境知识资源中心(Arid): Geospatial Analysis of Transmissivity and Uncertainty in a Semi-Arid Karst Region

Arid

DOI	10.3390/w16050780
	Geospatial Analysis of Transmissivity and Uncertainty in a Semi-Arid Karst Region
	Goncalves, Thiago dos Santos; Klammler, Harald; Leal, Luiz Rogerio Bastos
通讯作者	Klammler, H
来源期刊	WATER
EISSN	2073-4441
出版年	2024
卷号	16 期号:5
英文摘要	Aquifer properties, such as hydraulic transmissivity T and its spatial variability, are fundamental for sustainable groundwater exploitation in arid regions. Especially in karst aquifers, spatial variability can be considerable, and the application of geostatistical methods allows for spatial interpolation and mapping based on observations combined with the quantification of uncertainties. Moreover, direct measurements of T are typically scarce, while those of specific capacity Sc are more frequent. In this study, we establish the linear regression relationship between the logarithms of T and Sc measured in 51 wells in a semi-arid karst region in Northeastern Brazil. This relationship is used to estimate empirical values logTemp based on measurements of logSc at 269 wells. LogTemp values are found to be normally distributed with an isotropic variogram of a significant nugget effect (attributed to local-scale karst features) and approximately 10 km range (attributed to larger-scale gradual changes in karst feature density). Ordinary kriging cross-validation indicates an optimum number of 25 neighboring wells for interpolation, which is used in a conditional sequential Gaussian simulation (SGSIM) to generate 500 realizations of logTemp with respective maps of standard deviations and probabilities of (not) exceeding threshold values. High-transmissivity areas mostly coincide with karstified river valleys, while low-transmissivity areas occur toward the edges where aquifer thickness decreases. The resulting transmissivity maps are relevant for optimizing regional water management strategies, which includes stochastic approaches where transmissivity realizations can be used to parameterize multiple runs of numerical groundwater models.
英文关键词	groundwater aquifer specific capacity variogram kriging stochastic simulation
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001182925700001
WOS关键词	CAPACITY TESTS ; BRAZIL ; AQUIFER ; BIODIVERSITY ; UNA
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405859
推荐引用方式 GB/T 7714	Goncalves, Thiago dos Santos,Klammler, Harald,Leal, Luiz Rogerio Bastos. Geospatial Analysis of Transmissivity and Uncertainty in a Semi-Arid Karst Region[J],2024,16(5).
APA	Goncalves, Thiago dos Santos,Klammler, Harald,&Leal, Luiz Rogerio Bastos.(2024).Geospatial Analysis of Transmissivity and Uncertainty in a Semi-Arid Karst Region.WATER,16(5).
MLA	Goncalves, Thiago dos Santos,et al."Geospatial Analysis of Transmissivity and Uncertainty in a Semi-Arid Karst Region".WATER 16.5(2024).