References of "Briers, Pierre"
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See detailNitrate dynamic and pathways in fractured limestone aquifers : From soil leaching to groundwater discharge in surface water
Briers, Pierre ULg; Schmit, Flore; Orban, Philippe ULg et al

Conference (2016, July 27)

Fractured – karstified limestone aquifers constitute important, but vulnerable groundwater reservoirs in many areas across the World. Such carbonate systems are highly heterogeneous leading to a high ... [more ▼]

Fractured – karstified limestone aquifers constitute important, but vulnerable groundwater reservoirs in many areas across the World. Such carbonate systems are highly heterogeneous leading to a high spatial and temporal variability of fluxes across the soil – vadose zone – groundwater – surface water continuum. One of the main challenges worldwide is to protect such groundwater bodies from diffuse pollutions, in particular agricultural chemicals such as nitrate. To face such problems and to propose adequate pollution mitigation scenarios, the objective here was to better understand and quantify nitrate dynamics and pathways in the subsurface and at the groundwater – surface water interface. The transfer of nitrate was investigated in different ways such as monitoring of concentrations in both groundwater and surface water, tracer experiments in the unsaturated – saturated continuum and regional investigations on groundwater chemistry including stable isotopes of nitrate and other compounds. Results show that nitrate concentrations are relatively stable both in groundwater and surface water during the low flow period (i.e. from spring to autumn). A temporary but significant increase in nitrate concentration is observed in groundwater and rivers during the winter, related to release of residual nitrate from agricultural soils driven by infiltration water. In period of high precipitations and runoff, dilution is measured in the river. Monitoring and tracer test results also highlight the fact that the migration of dissolved contaminants across the unsaturated zone of limestone rocks is very fast and governed by gravitational flows. In the rivers, macroinvertebrates and benthic diatoms were sampled at several sites to assess ecological status and structural and functional response to alteration of water quality (nutrient enrichment) and quantity (current velocity and stream habitats). Diatom indices and community structure indicated good to very good status in both studied streams, indicating that elevated nitrate concentration have no detectable effect on biological quality of the surface waters. The combination of all these results allows developing a detailed conceptual model of the dynamics of nitrate (and other agricultural contaminants) in fractured / karstified limestone aquifers, with improved estimates of nitrate trends and dynamics in both groundwater and rivers. [less ▲]

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See detailDélivrable D3.3 Bilans hydrogéologiques
Schmit, Flore; Hallet, Vincent; Briers, Pierre ULg et al

Report (2016)

Detailed reference viewed: 32 (10 ULg)
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See detailCase study 2: Groundwater – surface water interaction in limestone areas of the GWB BE_Meuse_RWM021 (Belgium)
Brouyère, Serge ULg; Briers, Pierre ULg; Schmit, Flore et al

in Hinsby, Klaus; Schutten, Johan; Craig, Matt (Eds.) et al Technical Report on Groundwater Associated Aquatic Ecosystems (2015)

The achievement of good status in groundwater bodies involves meeting a series of conditions, which are defined in the Water Framework Directive (WFD) and, in the case of good chemical status, are given ... [more ▼]

The achievement of good status in groundwater bodies involves meeting a series of conditions, which are defined in the Water Framework Directive (WFD) and, in the case of good chemical status, are given further detail in the Groundwater Directive (GWD). One of these conditions is to ensure that groundwater inputs to associated surface waters do not result in failure to meet the environmental objectives of those waters or result in significant diminution in status/ecological or chemical quality of those waters. GWAAE (Groundwater Associated Aquatic Ecosystems) are those surface water bodies (SWBs), including rivers, standing waters and transitional waters where the surface water ecology and hydrology is dependent on contributions from groundwater in order to meet their environmental objectives under the WFD. These environmental objectives may vary, and therefore the associated environmental quality standards (EQS) or flow/level requirements of GWAAEs may differ between high status and good status SWBs. As noted in the Blueprint for Water, analysis of the first River Basin Management Plans has shown that Member States (MS) have experienced difficulties in understanding the interactions between groundwater and surface water and undertaking the necessary status assessments. This was highlighted in a survey carried out by Working Group Groundwater (WGGW) in 2014/15, which indicated that only half of the MS had assessed quantitative interactions and very few had addressed chemical pressures, including the derivation of threshold values (TVs) that were appropriate to the WFD objectives for GWAAEs. This report aims to further knowledge on what GWAAE are, how they are aligned to WFD processes, and support Member States to properly include the needs of these ecosystems in river basin management planning. The report clarifies the categories of GWAAE and their relative dependence on groundwater and collates current available knowledge and experience via a number of examples and case studies. Terminology and status assessment procedures are explained and pragmatic approaches are proposed which leave some flexibility for MS to adapt to their own specific needs. This technical report, which is not a "guidance document", makes use of and complements existing CIS documents, including existing technical reports on groundwater dependent terrestrial ecosystems (GWDTEs) and Guidance Document 18 (Guidance on Groundwater Status and Trend Assessment). A number of recommendations for technical users of the report are highlighted in boxes in each Chapter. The common themes from these recommendations are collated in Chapter 8, as issues and questions to WGGW and MS in general. The key message from this is the need for closer interaction between scientific disciplines, practitioners and Working Groups in developing conceptual understanding for GWAAEs and implementation of WFD requirements, including identification of GWAAEs, their characterisation and monitoring, and adopting appropriate status assessment methodologies. [less ▲]

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See detailCarte hydrogéologique de Wallonie, Reinartzhof – Hoscheit, 43/7-8
Gilson, Mylene; Briers, Pierre ULg; Ruthy, Ingrid ULg et al

Cartographic material (2015)

Detailed reference viewed: 23 (3 ULg)
See detailCarte hydrogéologique de Wallonie, Reinartzhof – Hoscheit, 43/7-8, 1/25.000 : [notice explicative]
Gilson, Mylene; Briers, Pierre ULg; Ruthy, Ingrid ULg et al

Book published by Service Public de Wallonie, DGARNE - Actualisation partielle: janvier 2015 - Première version: aout 2012 (2015)

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See detailCharacterization of stream - aquifer interaction in carbonate rocks
Briers, Pierre ULg; Sohier, Catherine ULg; Schmit, Flore et al

Poster (2014, September 30)

Groundwater - surface water interactions play a fundamental role in terms of quantity and quality of water and in terms of ecological quality of rivers. Despite many research efforts and the necessity to ... [more ▼]

Groundwater - surface water interactions play a fundamental role in terms of quantity and quality of water and in terms of ecological quality of rivers. Despite many research efforts and the necessity to better understand such interactions in order to reach effective management of water resources, stream-aquifer exchanges remain poorly understood, in particular in fractured carbonate environments. [less ▲]

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See detailDélivrable D2.1 : Mise à jour des données concernant les bassins étudiés
Briers, Pierre ULg; Schmit, Flore; Sohier, Catherine et al

Report (2014)

Detailed reference viewed: 12 (2 ULg)
See detailCarte hydrogéologique de Wallonie, Sart-Xhoffrai 50/1-2
Gilson, Mylene; Briers, Pierre ULg; Ruthy, Ingrid ULg et al

Cartographic material (2012)

Detailed reference viewed: 21 (3 ULg)
See detailCarte hydrogéologique de Wallonie, Sart-Xhoffrai 50/1-2, 1/25.000 : [notice explicative]
Gilson, Mylene; Briers, Pierre ULg; Ruthy, Ingrid ULg et al

Book published by Service Public de Wallonie, DGARNE - Version provisoire : décembre 2012 (2012)

Detailed reference viewed: 17 (2 ULg)
See detailCarte hydrogéologique de Wallonie, Stavelot-Malmédy 50/5-6
Briers, Pierre ULg; Gilson, Mylene; Ruthy, Ingrid ULg et al

Cartographic material (2012)

Detailed reference viewed: 19 (3 ULg)
See detailCarte hydrogéologique de Wallonie, Stavelot-Malmédy 50/5-6, 1/25.000 : [notice explicative]
Briers, Pierre ULg; Gilson, Mylene; Ruthy, Ingrid ULg et al

Book published by Service Public de Wallonie, DGARNE - Version provisoire : novembre 2012 (2012)

Detailed reference viewed: 18 (2 ULg)