Conceptualization and implementation of a regional groundwater model for the Neckar catchment in the framework of an integrated regional model

Jagelke, J.; Barthel, Roland

doi:10.5194/adgeo-5-105-2005

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…These wells were selected due to their continuous and long-term observation records. In general, the model agreement with observations compares well with other related studies applying hydrogeological models, where there is significant water level difference in the model domain (Tiedeman et al 2003;Jagelke and Barthel 2005;Cao et al 2013). Lack of some dynamics in simulated water levels could be due to lack of capture of recharge effects of large short-term precipitation events due to monthly inputs, and local effects or heterogeneities in the aquifer, which are not captured by the model.…”

Section: Modflow-owhm Calibration and Validationsupporting

confidence: 80%

Integrated hydrogeological modelling of hard-rock semi-arid terrain: supporting sustainable agricultural groundwater use in Hout catchment, Limpopo Province, South Africa

2019

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An integrated hydrogeological modelling approach applicable to hard-rock aquifers in semi-arid data-scarce Africa was developed using remote sensing, rainfall-runoff modelling, and a three-dimensional (3D) dynamic model. The integrated modelling approach was applied to the Hout catchment, Limpopo Province, South Africa, an important agricultural region where groundwater abstraction for irrigation doubled during 1968-1986. Since the 1960s, groundwater levels in irrigated areas have displayed extended periods of decline with partial or full recovery in response to major decadal rainfall events or periods. The integrated dynamic 3D hydrogeological flow model, based on the One-Water Hydrologic Flow Model (MODFLOW-OWHM), helped to understand recharge and flow processes and inform water use and management. Irrigation abstraction was estimated based on irrigated crop area delineated using the Landsat Normalized Difference Vegetation Index (NDVI) and crop water requirements. Using groundwater level data, the model was calibrated (2008-2012) and validated (2013-2015). Estimated mean diffuse recharge (3.3 ± 2.5% of annual rainfall) compared well with estimates from the Precipitation Runoff Modelling System model. Recharge and groundwater storage showed significant inter-annual variability. The ephemeral river was found to be losing, with mean net flux to the aquifer (focused recharge) of~1.1% of annual rainfall. The results indicate a delicate human-natural system reliant on the small but highly variable recharge, propagating through variable pumping to an even more variable storage, making the combined system vulnerable to climate and anthropogenic changes. The integrated modelling is fundamental for understanding spatio-temporal variability in key parameters required for managing the groundwater resource sustainably.

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Section: Modflow-owhm Calibration and Validationsupporting

confidence: 80%

Integrated hydrogeological modelling of hard-rock semi-arid terrain: supporting sustainable agricultural groundwater use in Hout catchment, Limpopo Province, South Africa

2019

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“…In data‐scarce regions, achieving reliable results from modelling requires compromises in the conceptual model, modelling strategy, and spatial discretization (Jagelke and Barthel, ; Barthel et al ., ). A modelling approach that can be well constrained to the limited data available, while still representing the dominant processes, is needed.…”

Section: Introductionmentioning

confidence: 99%

Groundwater modelling with limited data sets: the Chari–Logone area (Lake Chad Basin, Chad)

Candela

Elorza

Tamoh

et al. 2013

Hydrological Processes

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One of the most important issues for water resource management is developing strategies for groundwater modelling that are adaptable to data scarcity. These strategies are particularly important in arid and semi-arid areas where access to data is poor and data collection is difficult, such as the Lake Chad Basin in Africa. In the present study, we establish a numerical groundwater flow model and evaluate the effects of dry and wet periods on groundwater recharge in the Chari-Logone area (96 000 km 2 ) of the Lake Chad Basin. Boundary conditions, flow direction, sources, and sinks for the Chari-Logone local model were obtained by revising and remodelling the Lake Chad Basin regional hydrogeological model (508 400 km 2 ) developed by the BRGM (Bureau de Recherches Géologiques et Minières) in the 1990s. The simulated aquifer water level showed good agreement with observed levels. Aquifer recharge is primarily determined by river-aquifer interactions and mostly occurs in the southern section of the study area. In wet years, groundwater recharge also occurs in the N'Djamena area. The approach we adopted provided relevant results and was useful as an initial step in more detailed modelling of the area. It also proved to be a useful method for groundwater modelling in large semi-arid and arid regions where available data are scarce.

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“…The dipping layers lead to a complex hydrogeological condition; accordingly, the uppermost aquifer is formed by varying geological formations in distinct regions of the basin. In this situation, the hydrogeology of the basin is exceptionally complex [48]. Moreover, some anthropogenic changes affect the river and the consequent discharge in the research area's independent tributaries.…”

Section: Case Studymentioning

confidence: 99%

Clustering Simultaneous Occurrences of the Extreme Floods in the Neckar Catchment

Modiri¹,

Bàrdossy²

2021

Water

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Flood protection is crucial for making socioeconomic policies due to the high losses of extreme floods. So far, the synchronous occurrences of flood events have not been deeply investigated. In this paper, multivariate analysis was implemented to reveal the interconnection between these floods in spatiotemporal resolution. The discharge measurements of 46 gauges with a continuous daily time series for 55 years were taken over the Neckar catchment. Initially, the simultaneous floods were identified. The Kendall correlation between the pair sets of peaks was determined to scrutinize the similarities between the simultaneous events. Agglomerative hierarchical clustering tree (AHCT) and multidimensional scaling (MDS) were employed, and obtained clusters were compared and evaluated with the Silhouette verification method. AHCT shows that the Average and Ward algorithms are appropriate to detect reasonable clusters. The Neckar catchment has been divided into three major clusters: the first cluster mainly covers the western part and is bounded by the Black Forest and Swabian Alps. The second cluster is mostly located in the eastern part of the upper Neckar. The third cluster contains the remaining lowland areas of the Neckar basin. The results illustrate that the clusters act relatively as a function of topography, geology, and anthropogenic alterations of the catchment.

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Conceptualization and implementation of a regional groundwater model for the Neckar catchment in the framework of an integrated regional model

Cited by 10 publications

References 2 publications

Integrated hydrogeological modelling of hard-rock semi-arid terrain: supporting sustainable agricultural groundwater use in Hout catchment, Limpopo Province, South Africa

Integrated hydrogeological modelling of hard-rock semi-arid terrain: supporting sustainable agricultural groundwater use in Hout catchment, Limpopo Province, South Africa

Groundwater modelling with limited data sets: the Chari–Logone area (Lake Chad Basin, Chad)

Clustering Simultaneous Occurrences of the Extreme Floods in the Neckar Catchment

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