A5045735666- Hydrology and Watershed Management Studies
- Flood Risk Assessment and Management
- Hydrology and Drought Analysis
- Water resources management and optimization
- Hydrology and Sediment Transport Processes
- Soil erosion and sediment transport
- Fish Ecology and Management Studies
- Hydrological Forecasting Using AI
- Groundwater and Watershed Analysis
- Groundwater flow and contamination studies
- Research Data Management Practices
- Reservoir Engineering and Simulation Methods
- Water Governance and Infrastructure
- Freshwater macroinvertebrate diversity and ecology
- Environmental Science and Water Management
- Precipitation Measurement and Analysis
- Hydraulic flow and structures
- scientometrics and bibliometrics research
- Water-Energy-Food Nexus Studies
- Academic Publishing and Open Access
- Water Systems and Optimization
- Transboundary Water Resource Management
- Soil and Water Nutrient Dynamics
- Climate variability and models
- Rangeland Management and Livestock Ecology
Rhodes University
2015-2024
Bangor University
2007-2022
Norsk Hydro (Norway)
1986-2016
Water Research Institute
2013
Aberystwyth University
1980
The Prediction in Ungauged Basins (PUB) initiative of the International Association Hydrological Sciences (IAHS), launched 2003 and concluded by PUB Symposium 2012 held Delft (23–25 October 2012), set out to shift scientific culture hydrology towards improved understanding hydrological processes, as well associated uncertainties development models with increasing realism predictive power. This paper reviews work that has been done under six science themes Decade outlines challenges ahead for...
The new Scientific Decade 2013–2022 of IAHS, entitled "Panta Rhei—Everything Flows", is dedicated to research activities on change in hydrology and society. purpose Panta Rhei reach an improved interpretation the processes governing water cycle by focusing their changing dynamics connection with rapidly human systems. practical aim improve our capability make predictions resources support sustainable societal development a environment. concept implies focus hydrological systems as interface...
Abstract An algorithm is described that was initially developed as a simple method for patching and extending observed time series of daily streamflow. It based on the use 1-day flow duration curves each month year assumption flows occurring simultaneously at sites in reasonably close proximity to other correspond similar percentage points their respective curves. The has been incorporated into model allows destination site be estimated from several source sites. applied six groups...
Abstract Africa is severely affected by floods, with an increasing vulnerability to these events in the most recent decades. Our improved preparation against and response this hazard would benefit from enhanced understanding of physical processes at play. Here, a database 399 African stream gauges used analyze seasonality observed annual maximum flood, precipitation soil moisture between 1981 2018. The includes total 11,302 flood events, covering regions. analysis based on directional...
Abstract The paper examines the applicability of several desktop hydrology-based environmental flow assessment methods—Tennant, range variability approach (RVA) and South African reserve model (DRM)—in specific context Nepal. Some these techniques are modified, following discussion their limitations. It is indicated that methods represent a necessary first step in planning for allocations developing countries. shown use can be made complementary features existing to arrive at justified...
Abstract The increasing demand for water in southern Africa necessitates adequate quantification of current freshwater resources. Watershed models are the standard tool used to generate continuous estimates streamflow and other hydrological variables. However, accuracy results is often not quantified, model assessment hindered by a scarcity historical observations. Quantifying uncertainty would increase value credibility predictions. A model-independent framework aimed at achieving...
Gaps in hydrological information of the Congo Basin increase uncertainties understanding hydroclimatic processes basin, and consequently risks associated with decision making for major water resources development plans. There is also uncertainty about predictions future climate land use change. These challenges make it essential to explore possible approaches close gaps. Some gaps can be filled using simulation models, which if they prove practical, established available data, but generate...
Wetlands are important components of many large river systems. Some basin scale hydrological models do include explicit sub-models to deal with wetland impacts, but one the key challenges is estimate appropriate parameter values represent channel-wetland exchange processes. A combined modelling approach applied in this study and involves use detailed, daily time-step, LISFLOOD-FP hydraulic model improve understanding dynamics quantify parameters a model. While there remain, uncertainties...
Abstract A method is described that allows long-term 1-day annual and seasonal flow duration curves at any ungauged location in one of the drainage regions South Africa to be established. The based on normalization observed by a mean daily subsequent averaging normalized ordinates curves. estimate discharge for an site obtained using information from existing national data base characteristics. established set further translated into actual streamflow time series simple nonlinear spatial...
This paper presents a preliminary stage in the development of an alternative parameterisation procedure for Pitman monthly rainfall runoff model which enjoys popular use water resource assessment Southern Africa. The estimation procedures are based on premise that it is possible to physical basin properties directly quantification soil moisture accounting, runoff, and recharge infiltration parameters. results selected basins show revised parameters at least as good current regionalised sets...
Abstract. The African continent is probably the one with lowest density of hydrometric stations currently measuring river discharge despite fact that number operating was quite important until 1970s. This new Database Hydrometric Indices (ADHI) provides a wide range indices and hydrological signatures computed from different sources data after quality control. It includes 1466 at least 10 years daily over period 1950–2018. average record length 33 years, 131 have complete records 50 years....
Abstract A monthly rainfall-runoff model was calibrated for a large tropical catchment in southern India. Various land-use and climatic change scenarios were tested to assess their effects on mean annual runoff assured water yield at the Bhavanisagar Reservoir Tamil Nadu, The largest increase (19%) came from converting forest savanna (the indigenous control scenario) agriculture. Mean decreased by 35% after conversion commercial 6% partial tea plantations. predicted climate of reduced dry...
Abstract Transmission losses through the bed of ephemeral rivers in arid and semiarid regions can account for a large proportion total amount runoff generated upstream. Losses have typically been estimated by measuring discharge at two points channel system. This paper presents some results from catchment South Africa based on moisture observations alluvial material using neutron probe access tubes. Channel flow this is very infrequent occurrence consequently few opportunities to observe...
Abstract Small dams represent an important local-scale resource designed to increase water supply reliability in many parts of the world where hydrological variability is high. There evidence that number farm has increased substantially over last few decades. These developments can have a substantial impact on downstream flow volumes and patterns, use ecological functioning. The study reports application modelling approach investigate uncertainty associated with simulating impacts several...
The potential role of rural land use in mitigating flood risk and protecting water supplies continues to be great interest regulators planners. ability hydrologists quantify the impact change on cycle is however limited we are not able provide consistently reliable evidence support planning policy decisions. This shortcoming stems mainly from lack data, but also modelling methods tools. Numerous research projects over last few years have been attempting address underlying challenges. paper...