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Author Ollivier, C.C.; Carrière, S.D.; Heath, T.; Olioso, A.; Rabefitia, Z.; Rakoto, H.; Oudin, L.; Satgé, F. url  openurl
  Title (up) Ensemble precipitation estimates based on an assessment of 21 gridded precipitation datasets to improve precipitation estimations across Madagascar Type Journal Article
  Year 2023 Publication Journal of Hydrology: Regional Studies Abbreviated Journal  
  Volume 47 Issue Pages 101400  
  Keywords Precipitation products, Remote sensing, Ensemble approach, Hydrology, Madagascar  
  Abstract Study region this study focuses on Madagascar. This island is characterized by a great diversity of climate, due to trade winds and the varying topography. This country is also undergoing extreme rainfall events such as droughts and cyclones. Study focus the rain gauge network of Madagascar is limited (about 30 stations). Consequently, we consider relevant satellite-based precipitation datasets to fill gaps in ground-based datasets. We assessed the reliability of 21 satellite-based and reanalysis precipitation products (P-datasets) through a direct comparison with 24 rain gauge station measurements at the monthly time step, using four statistical indicators: Kling-Gupta Efficiency (KGE), Correlation Coefficient (CC), Root Mean Square Error (RMSE), and Bias. Based on this first analysis, we produced a merged dataset based on a weighted average of the 21 products. New hydrological insights for the region based on the KGE and the CC scores, WFDEI (WATCH Forcing Data methodology applied to ERA-Interim), CMORPH-BLD (Climate Prediction Center MORPHing satellite-gauge merged) and MSWEP (Multi-Source Weighted Ensemble Precipitation) are the most accurate for estimating rainfall at the national scale. Additionally, the results reveal a high discrepancy between bio-climatic regions. The merged dataset reveals higher performance than the other products in all situations. These results demonstrate the usefulness of a merging approach in an area with a deficit of rainfall data and a climatic and topographic diversity.  
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  ISSN 2214-5818 ISBN Medium  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Ollivier2023101400 Serial 288  
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Author Külls, C.; Jobin, J.; Weiler, M. openurl 
  Title (up) Environmental analytics for water carbon management: enable WCM: Schlussbericht Type Report
  Year 2015 Publication Abbreviated Journal  
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  Publisher Albert Ludwigs Universität, Professur für Hydrologie Place of Publication Editor  
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  Notes Approved no  
  Call Number THL @ christoph.kuells @ Kuells2015environmental Serial 65  
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Author Külls, C.; Marx, V.; Bittner, A.; Ellmies, R.; Seely, M. openurl 
  Title (up) Environmental impacts on the hydrology of ephemeral streams and alluvial aquifers Type Conference Article
  Year 2009 Publication EGU Geophysical Abstracts Abbreviated Journal  
  Volume Issue Pages 5517  
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  Call Number THL @ christoph.kuells @ Kuells2009environmental Serial 53  
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Author Lima, G.F.C.; Filho, C.A. de C.; Ferreira, V.G.; Lima, J. da S.D.; Marques, E.D.; Minardi, P.S.P.; Dalmázio, I.; Moreira, R.M. url  openurl
  Title (up) Establishing a water baseline for the unconventional gas industry: A multiple environmental isotopes assessment (18O, 2H, 3H, 13C, and 14C) of surface and groundwater in the São Francisco Basin, Brazil Type Journal Article
  Year 2023 Publication Applied Geochemistry Abbreviated Journal  
  Volume 159 Issue Pages 105818  
  Keywords Fracking, Groundwater dating, Indaiá river, Isotopes assessment, Shale gas, Unconventional hydrocarbons  
  Abstract Unconventional hydrocarbon production has become the target of an intensive environmental debate due to the risks it poses to water resources. Fracking, while enabling the extraction of oil and gas from ultra-low permeability reservoirs, also possesses the risk of polluting water systems through failures from hydraulic fracturing and its associated procedures. The need to foster national industrial development with a transitional energy matrix has led Brazil to discuss the environmental suitability before producing its large unconventional reserves. Many studies have highlighted the need for a robust environmental characterization before the development of the unconventional industry. In this sense, multiple environmental isotopes may work as a proxy for identifying water contamination right from the early stages. Environmental isotopes may also be applied to enhance the understanding of the natural geochemical processes intrinsic to a given area. This study presents an environmental isotopes baseline for the groundwater and riverine water systems within the São Francisco Basin, a proven tight gas reservoir in Brazil, in a pre-operational context. δ18O, δ2H, 3H, δ13C, and Δ14C were evaluated in three different seasons in groundwater and surface water samples, along with other auxiliary parameters such as physical-chemical parameters (in situ), major ions, and d-excess. The δ2H and δ18O in surface water shows an upstream → downstream enrichment trend, with some variations suggesting baseflow interactions in the surface water systems. An evaporation line for the study area was defined as δ2H = 4.6903 δ18O + 10.362. δ13C indicates a mutual dissolution of silicates and carbonates in the groundwater system and suggests a group of samples highly related to the recharge areas. Groundwater dating denotes the Serra da Saudade Formation as a modern fractured aquifer with a strong recharge capacity. These findings support stakeholders in environmental monitoring and management of the unconventional gas industry.  
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  ISSN 0883-2927 ISBN Medium  
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  Call Number THL @ christoph.kuells @ lima_establishing_2023 Serial 173  
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Author Klock, H.; Külls, C.; Udluft, P. openurl 
  Title (up) Estimating recharge values using hydrochemical and geological data: a case study from the Type Conference Article
  Year 2001 Publication Impact of Human Activity on Groundwater Dynamics: Proceedings of an International Symposium (Symposium S3) Held During the Sixth Scientific Assembly of the International Association of Hydrological Sciences (IAHS) at Maastricht, The Netherlands, from 18 t Abbreviated Journal  
  Volume Issue 269 Pages 25  
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  Area Expedition Conference International Assn of Hydrological Sciences  
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  Call Number THL @ christoph.kuells @ Klock2001estimating Serial 60  
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