A5087508820- Hydrology and Watershed Management Studies
- Groundwater flow and contamination studies
- Groundwater and Watershed Analysis
- Water resources management and optimization
- Groundwater and Isotope Geochemistry
- Flood Risk Assessment and Management
- Hydrology and Drought Analysis
- Climate variability and models
- Reservoir Engineering and Simulation Methods
- Hydraulic Fracturing and Reservoir Analysis
- Geological Modeling and Analysis
- Arsenic contamination and mitigation
- Water-Energy-Food Nexus Studies
- Heavy Metal Exposure and Toxicity
- Geophysics and Gravity Measurements
- Hydrology and Sediment Transport Processes
- Climate change impacts on agriculture
- African studies and sociopolitical issues
- Geochemistry and Geologic Mapping
- Geophysical and Geoelectrical Methods
- Irrigation Practices and Water Management
- Child Nutrition and Water Access
- Soil erosion and sediment transport
- Water Quality and Pollution Assessment
- Soil and Water Nutrient Dynamics
British Geological Survey
2011-2024
Acadia University
2006
Natural Resources Institute
1999
Risk management has reduced vulnerability to floods and droughts globally1,2, yet their impacts are still increasing3. An improved understanding of the causes changing is therefore needed, but been hampered by a lack empirical data4,5. On basis global dataset 45 pairs events that occurred within same area, we show risk generally reduces faces difficulties in reducing unprecedented magnitude not previously experienced. If second event was much more hazardous than first, its impact almost...
Abstract One of the key uncertainties surrounding impacts climate change in Africa is effect on sustainability rural water supplies. Many these supplies abstract from shallow groundwater (<50 m) and are sole source safe drinking for populations. Analysis existing rainfall recharge studies suggests that unlikely to lead widespread catastrophic failure improved These require only 10 mm annually per year support a hand pump, which should still be achievable much continent, although up 90...
The distributions of δ 18 O, salinity, temperature, and nutrients have been used to quantify water sources the Mackenzie shelf in Beaufort Sea. Comparison mass analyses with satellite imagery confirms that meteoric (runoff) is associated plume. seasonally variable surface layer for viewed as cycling between a “reverse estuary” winter, when polar mixed (PML) formed, positive estuary summer waters respond freshwater inputs (runoff ice melt). We infer standing stock 3.7 m fresh at end 1986,...
Abstract The issues pertaining to groundwaterdrought are reviewed with particular regard the historical and present situations in Malawi, northern Ghana Northern Province of South Africa. These three quite different examples highlight some major difficulties facing respective governmentsand donor agencies, not least shortcomingsof drought-reliefdrilling programmes,the general lack routine monitoring need for longer term analysis assessment groundwatersystems than is currently possible....
Abstract In E urope in recent years, there has been recognition of the need to better understand risk from groundwater flooding. This due both occurrence major flooding events clearly attributable and inclusion uropean national legislation. The case study city O xford on R iver T hames flood plain UK is used examine mechanisms for urbanised settings. Reference made an extensive data set gathered during a event 2007. Groundwater significant number properties shown occur areas isolated fluvial...
Climate change is predicted to increase rainfall intensity in tropical regions. Convection permitting (CP) climate models have been developed address deficiencies conventional that use parameterised convection. However, date, precipitation projections from CP not used conjunction with hydrological explore potential impacts of explicit modelling convective on river flows the tropics. Here we apply outputs a continental scale model as inputs lumped rainfall-runoff Africa for first time....
Abstract Controls on the spatio‐temporal extent of groundwater flooding are poorly understood, despite long duration flood events and distinct social economic impacts. We developed a novel approach using statistical analysis level hydrographs impulse response functions (IRFs) applied it to 2013/2014 Chalk in English Lowlands. proposed standardized index which we calculated for monthly levels 26 boreholes Chalk. grouped these series k ‐means cluster cross‐correlated centroids with...
The need for the development of adaptation strategies climate change in Africa is becoming critical. For example, infrastructure with a long lifespan now needs to be designed or adapted account future that will different from past present. There growing necessity information used decision making traditional science-driven metrics decision-driven metrics. This particularly relevant East Africa, where limited and socio-economic capacity make this region acutely vulnerable change. Here, we...
Deeply weathered crystalline rock aquifer systems comprising unconsolidated saprolite and underlying fractured bedrock (saprock) underlie 40% of sub‐Saharan Africa. The vulnerability this system to contamination, particularly in rapidly urbanizing areas, remains poorly understood. In order assess solute viral transport derived from Precambrian gneiss, forced‐gradient tracer experiments using chloride Escherichia coli phage ΦX174 were conducted southeastern Uganda. bacteriophage was largely...
The need for a detailed investigation of the Vea catchment water balance components cannot be overemphasized due to its accelerated land-cover dynamics and associated impacts on hydrological processes. This study assessed possible consequences land-use change scenarios (i.e. business as usual, BAU, afforestation year 2025) compared 2016 baseline catchment’s using Soil Water Assessment Tool (SWAT) model. data used include daily climate discharge, soil land use/land cover maps. results...
Abstract Understanding temporal variability in groundwater levels is essential for water resources management. In sub‐Saharan Africa, level dynamics are poorly constrained due to limited long‐term observations. Here, we present the first published analysis of at national scale using 12 multidecadal (ca. 1980s present) hydrographs Burkina Faso. For each hydrograph, developed lumped parameter models which achieved acceptable calibrations (NSE = 0.5–0.99). eight sites not showing significant (...
Abstract Groundwater stored in weathered basement aquifers (WBAs) is a strategic water resource. In this study, we investigate the productivity of WBAs and sustainability groundwater abstractions using novel process‐based stochastic modeling approach, which applied to simulate Precambrian aquifer Ghana. The statistical distribution generated synthetic yield data was found very good agreement with observed from same Ghanaian aquifer. Further analysis provided robust insights regarding how...
Abstract A data-driven modelling approach was applied to quantify the potential groundwater yield from weathered crystalline basement aquifers in West Africa, which are a strategic resource for achieving water and food security. To account possible geological control on aquifer productivity, seven major domains were identified based lithological, stratigraphic, structural characteristics of basement. Extensive data mining conducted hydrogeological parameterisation that led identification...
Abstract Natural flood management (NFM) is widely promoted for managing risks but the effectiveness of different types NFM schemes at medium (100–1000 km 2 ) and large scales (>1000 remains unknown. This study demonstrates importance fully understanding impact model structure, calibration uncertainty techniques on results before assessment undertaken. Land‐based undertaken in two medium‐scale lowland catchments within Thames River basin (UK) with a modelling approach that uses Soil Water...
Burabay National Nature Park (BNNP) of North Kazakhstan is located between humid boreal forests and an arid steppe Central Asia. The stable hydrogen oxygen isotope analyses precipitation, stream, lake ground waters were used for water budget calculations the BNNP endorheic system to assess impact increasing aridity on lakes in this most continental part Earth. results confirmed two different types BNNP: Shortandy Lakes are more similar higher latitude (e.g. South Siberia), while Kishi Ulken...
Abstract. In crystalline basement regions of Africa, shallow weathered aquifers provide vital water resources for rural communities. To quantify evidence the behaviour these aquifers, groundwater levels were observed at a network 65 boreholes within Romwe Catchment in southern Zimbabwe. Soil moisture was monitored selected sites. Groundwater hydrographs showed considerable spatial and temporal variation. Where soil profile freely draining, typically responded few days major rainstorms large...