This paper presents a preliminary assessment of the hydrogeological characteristics of a karst mountainous catchment, the Suoi Muoi River catchment, in the northwest of Vietnam. The catchment is located at 600–700 m ...This paper presents a preliminary assessment of the hydrogeological characteristics of a karst mountainous catchment, the Suoi Muoi River catchment, in the northwest of Vietnam. The catchment is located at 600–700 m a.s.l. and covers an area of 284 km. Exposed limestone occupies 32% of the total catchment area. Various types of assessments have been carried out, including geological and hydrogeological field surveys, cave surveys, dye-tracer tests, meteorological and surface water monitoring. Geological studies and cave surveys have identified the most important active cave/conduit systems within the catchment. Although these data are essential, they are insufficient to make a comprehensive appraisal of the hydrologic nature of the catchment under interest. An attempt was made to calculate a global water balance of the catchment, based on short-term (15 months) meteorological and streamflow records. The results show that, despite the existence of a number of substantial cavern conduit systems, the groundwater system of the catchment is governed by the fracture/fissure matrix. The cavern conduit systems only collect groundwater from the adjacent fracture matrix and/or connect topographically isolated surface watercourses. The groundwater storage of the cavern conduit systems appears to be regionally insignificant in comparison with the governed fracture matrix groundwater system.展开更多
In application of the European Water Framework Directive,the water development and management plan,Schéma d'aménagement et de gestion des eaux(SAGE)for the Lys(Lily)watershed area sets out general object...In application of the European Water Framework Directive,the water development and management plan,Schéma d'aménagement et de gestion des eaux(SAGE)for the Lys(Lily)watershed area sets out general objectives for the use,development,and quantitative and qualitative protection of water resources and aquatic environments.The Lys SAGE issues include the pollution of aquatic media and a provision for reducing the impact of discharges from on-site sanitation devices.The prioritization of public authority action on on-site sanitation requires the definition and identification of zones with environmental issues.The objective is to identify priority areas for the rehabilitation of noncompliant on-site sanitation devices in case of a proven risk of pollution.These zones have been identified and mapped following the development and application of a methodology based on current regulations,feedback,and an innovative approach.It is based on the risk assessment of on-site sanitation.To do this,a hazard(source hydraulicflow)was crossed with the vulnerability of the environment(targetflow impact on stream quality).In addition to vulnerability assessed by the chemical quality of watercourses,the concept of zones of ecological interest was introduced.展开更多
文摘This paper presents a preliminary assessment of the hydrogeological characteristics of a karst mountainous catchment, the Suoi Muoi River catchment, in the northwest of Vietnam. The catchment is located at 600–700 m a.s.l. and covers an area of 284 km. Exposed limestone occupies 32% of the total catchment area. Various types of assessments have been carried out, including geological and hydrogeological field surveys, cave surveys, dye-tracer tests, meteorological and surface water monitoring. Geological studies and cave surveys have identified the most important active cave/conduit systems within the catchment. Although these data are essential, they are insufficient to make a comprehensive appraisal of the hydrologic nature of the catchment under interest. An attempt was made to calculate a global water balance of the catchment, based on short-term (15 months) meteorological and streamflow records. The results show that, despite the existence of a number of substantial cavern conduit systems, the groundwater system of the catchment is governed by the fracture/fissure matrix. The cavern conduit systems only collect groundwater from the adjacent fracture matrix and/or connect topographically isolated surface watercourses. The groundwater storage of the cavern conduit systems appears to be regionally insignificant in comparison with the governed fracture matrix groundwater system.
基金MEEDDM-CDGDD,Grant/Award Number:MEEDDM-CDGDD-DRI R-2011-8C-0028-A0ANCRES research project(GESSOL program)+2 种基金Artois-Picardie Water AgencyPas-de-Calais DepartmentEPTB-Lys。
文摘In application of the European Water Framework Directive,the water development and management plan,Schéma d'aménagement et de gestion des eaux(SAGE)for the Lys(Lily)watershed area sets out general objectives for the use,development,and quantitative and qualitative protection of water resources and aquatic environments.The Lys SAGE issues include the pollution of aquatic media and a provision for reducing the impact of discharges from on-site sanitation devices.The prioritization of public authority action on on-site sanitation requires the definition and identification of zones with environmental issues.The objective is to identify priority areas for the rehabilitation of noncompliant on-site sanitation devices in case of a proven risk of pollution.These zones have been identified and mapped following the development and application of a methodology based on current regulations,feedback,and an innovative approach.It is based on the risk assessment of on-site sanitation.To do this,a hazard(source hydraulicflow)was crossed with the vulnerability of the environment(targetflow impact on stream quality).In addition to vulnerability assessed by the chemical quality of watercourses,the concept of zones of ecological interest was introduced.
