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GROUNDWATER QUALITY AND CONTAMINATION INDEX MAPPING IN CHANGCHUN CITY,CHINA

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Chinese Geographical Science 2004年第1期14卷 63-70页

作者： hamadoun bokar College of Environment and Resources Jilin UniversityChangchun 130026P.R.China

Groundwater in Changchun City, Jilin Province of China tends to be influenced by human activities. Chemical types of groundwater were detected in both shallow and deep groundwater were: HCO3--Ca2+ and HCO3--Ca2+·Mg2+ or HCO3--Mg2+·Ca2+; SO42--Ca2+ and SO42--Ca2+·Mg2+; Cl--Ca2+; and CO32--Na+. The deteriorations of groundwater quality due to the increase of TDS, NO3-+ NO2-(as Nitrogen) and TH contents have been observed from 1991 to 1998. Scatter analyses showed strong positive correlations between Ca2+, Cl-and NO3-ions and weak negative correlations between the depth of water table and Ca2+, SO42-, Cl-and NO3-ions. A mapping of contaminant index based on Chinese standard of groundwater showed that a large proportion of the groundwater in 1998 was deteriorated by human process. Despite their low values of sodium adsorption ratio (SAR), the most of the sampled wells were not suitable for drinking and agriculture purposes due to higher contents of NO3-, NO2-and Mn2+ ions.

关键词： hydrochemistry groundwater quality contaminant index linear regression analysis GIS mapping Changchun City

Predicting Groundwater Level Using Climate Change Scenarios in the Southern Part of Mali

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American Journal of Climate Change 2023年第1期12卷 21-38页

作者： Oumou Diancoumba Adama Toure Souleymane Keita Sériba Konare Zakari Mahamadou Mounir hamadoun bokar Life and Earth Sciences Department (DER-SVT) Normal Superior School (ENSup) Bamako Mali Department of Geology National Engineering School (ENI-ABT) Bamako Mali Department of Civil Engineering National Engineering School (ENI-ABT) Bamako Mali Department of Rural Engineering Forest and Water Polytechnic Rural Institute of Katibougou (IPR/IFRA) Koulikoro Mali Department Hygiene-Safety-Environment Andre Salifou University of Zinder University Institute of Technology Zinder Niger

Groundwater is mainly demanded in all the activities for the population of the southern part especially in the Koda catchment, the studied area. These resources are affected by various factors especially climate change. Therefore, knowing the impact of projected climate change on groundwater recharge is an important issue for water resources management, especially for those responsible for the Koda catchment. In this work, the impact of climate change on groundwater resources in the study area in Mali, West Africa is investigated. The Hydrogeological modeling was performed using the Gardenia model, and the monthly precipitation and temperature data were used as the Baseline. These data considered the past 30-year period (1987-2016) and the projections for the next 30 years (2021-2050). Projected precipitation and air temperatures, extracted from the Rossby Centre regional Atmospheric climate model (RCA 4) statistically downscaled from the GCM-IHEC-EC-EARTH and the GCM-MPI-M-MPI-ESM-LR under the Representative Concentration Pathways RCP 4.5 and RCP 8.5 and corrected with the Multiscale Quantile Mapping bias correction method, were used as input data to the gardenia model. Potential evapotranspiration (PET) values estimated from Blaney Criddle method and groundwater levels measured in three piezometers were used to calibrate the Gardenia model. The outputs display the reduction of groundwater level in the three piezometers in the Koda catchment for all the two Regional Climate Models (RCMs) during the periods of rainy season from July to October. From the results of GCM IHEC-EC-EARTH, the projected decline in GWL reaches 1.09 m for the RCP 4.5 and it up to 1.26 m for the RCP 8.5 in the study area while the GCM MPI-M-MPI-ESM-LR presentes the decline in groundwater level (GWL) during winter season from about 0.62 m for the RCP 4.5 up to 1.93 m for the RCP 8:5. Both RCMs project a reduction trend of groundwater recharge over time. It is noticeable that this decline is gr

关键词： Climate Change RCM-GCMs Groundwater Projection Mali

Flood Forecasting and Warning System: A Survey of Models and Their Applications in West Africa

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American Journal of Climate Change 2023年第1期12卷 1-20页

作者： Mohamed Fofana Julien Adounkpe Sam-Quarco Dotse hamadoun bokar Andrew Manoba Limantol Jean Hounkpe Isaac Larbi Adama Toure Graduate Research Program on Climate Change and Water Resources West African Science Service Center on Climate Change and Adapted Land Use (WASCAL) Department of Applied Hydrology University of Abomey-Calavi Cotonou Abomey-Calavi Benin National Water Institute University of Abomey Calavi Abomey Calavi Atlantic Benin School of Sustainable Development University of Environmental and Sustainable Development Somanya Ghana National Engineer School ENI-ABT Bamako Mali

Flood events occurrences and frequencies in the world are of immense worry for the stability of the economy and life safety. Africa continent is the third continent the most negatively affected by the flood events after Asia and Europe. Eastern Africa is the most hit in Africa. However, Africa continent is at the early stage in term of flood forecasting models development and implementation. Very few hydrological models for flood forecasting are available and implemented in Africa for the flood mitigation. And for the majority of the cases, they need to be improved because of the time evolution. Flash flood in Bamako (Mali) has been putting both human life and the economy in jeopardy. Studying this phenomenon, as to propose applicable solutions for its alleviation in Bamako is a great concern. Therefore, it is of upmost importance to know the existing scientific works related to this situation in Mali and elsewhere. The main aim was to point out the various solutions implemented by various local and international institutions, in order to fight against the flood events. Two types of methods are used for the flood events adaptation: the structural and non-structural methods. The structural methods are essentially based on the implementation of the structures like the dams, dykes, levees, etc. The problem of these methods is that they may reduce the volume of water that will inundate the area but are not efficient for the prediction of the coming floods and cannot alert the population with any lead time in advance. The non-structural methods are the one allowing to perform the prediction with acceptable lead time. They used the hydrological rainfall-runoff models and are the widely methods used for the flood adaptation. This review is more accentuated on the various types non-structural methods and their application in African countries in general and West African countries in particular with their strengths and weaknesses. Hydrologiska Byråns Vattenbalansavdelning (H

关键词： Flood Forecasting Hydrological Models Climate Change West

Assessing the Effects of Land Use/Land Cover Change on Groundwater Recharge in a Sudano-Sahelian Zone: Case of Koda Catchment, Mali, West Africa

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Journal of Geoscience and Environment Protection 2022年第8期10卷 39-54页

作者： Oumou Diancoumba Adama Toure Ibrahima Daou Seriba Konare Taoufik Hermassi Mohamed Kotti hamadoun bokar Nourredine Galoul Zoubeida Bargaoui Ecole Normale Supérieure de Bamako (ENSup) Département Sciences de la Vie et de la Terre (DER-SVT) Bamako Mali Ecole Nationale d’Ingénieurs Abderrahmane Baba Touré (ENI-ABT) Bamako Mali Institut Polytechnique Rural de Formation et de Recherche Appliquée de Katibougou (IPR/IFRA de Katibougou) Koulikoro Mali Institut National des Recherches en Génie Rural Eau et Forêts (I.N.R.G.R.E.F) Tunis Tunisie Ecole Nationale d’Ingénieurs de Tunis ENIT Tunis Tunisie

Groundwater is the main source of water in the studied area;therefore, it is significantly requested in all the activities of the inhabitants. These natural resources are affected by some drivers especially Land Use/Land Cover (LULC) and Climate Change. A Land Use/Land Cover (LULC) dynamics study is crucial for any global environmental change evaluation. For instance, for a given place, its change could affect considerably water cycle components. Therefore, the knowledge of the effects of LULC on groundwater recharge is then the key in water resources management system, in particular for the decision makers of the Koda Catchment where the scarcity of the water availability for agriculture is real. The spatiotemporal variation of the different units of LULC present in the catchment has been examined in this study. The Envi 4.5 Software coupled with ArcGIS using the Supervised Classification method, was applied to subset Landsat images from 1990 to 2016. Five (5) major LULC categories, cultivated land, bare land, herbaceous savannah, shrubby savannah and degraded savannah, were identified in the catchment. In a parallel direction, the groundwater recharge has been estimated through the conceptual Gardenia model for the same period 1990-2016. The results showed that the portion of cultivated land and bare land increased (14.9% and 23.5% respectively) while, the portion of savannah decreased: herbaceous savannah by 24.4%, degraded savannah by 10.32% and Shrubby Savannah by 3.6%. Savannah areas in Koda catchment is converted to agricultural land and urban area due to human activities. The decline of 8.4% in groundwater recharge might become so far obvious in the future if the current rate of deforestation continues in the Koda catchment. There is a need to closely monitor the changes in LULC for sustainable development. The results of this study could help to well understand the recharge pattern across Koda catchment under a changing LULC.

关键词： LULC Change Groundwater Recharge Gardenia Model GIS Koda Catchment Mali

Predicting Groundwater Level Using Climate Change Scenarios in the Southern Part of Mali

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Flood Forecasting and Warning System: A Survey of Models and Their Applications in West Africa

American Journal of Climate Change（美国气候变化期刊） 2023年第1期

作者： Oumou Diancoumba Adama Toure Souleymane Keita Sériba Konare Zakari Mahamadou Mounir hamadoun bokar

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