Download or read book Integrated Catchment Modelling of Sedimentation Processes of Reservoirs a Case Study of the Welbedacht Reservoir South Africa written by Dunisani Thomas Chabalala and published by . This book was released on 2014 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discusses the main objective of this research was to investigate and develop an integrated catchment modelling of sedimentation processes and management for the Welbedacht reservoir. The specific objectives of the study were: 1. to determine the various sources and rates of sediment transport.; 2. to develop a model for integrated catchment sedimentation processes and 3. to apply the model developed in (2) in order to design integrated catchment sedimentation management strategies for the Welbedacht reservoir.
Download or read book Dealing with reservoir sedimentation guidelines and case studies written by and published by . This book was released on 1999 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrated Modeling of Land and Water Resources in Two African Catchments written by Seleshi Getahun Yalew and published by CRC Press. This book was released on 2018-03-14 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demand for land and water for agriculture, urbanization, irrigation, hydropower, and industrialization is increasing to meet the demands of growing populations and of growing economies. However, changes in land and water resources are often studied separately. A better representation of the interaction between land-use change and its drivers on the one hand and water resources on the other is imperative for sustainable environmental management. This research investigates and develops spatial analysis methods and tools for the quantification of dynamic feedbacks between land-use change and water resources, by focusing on case study catchments in Ethiopia and South Africa. Furthermore, the research investigates methods for analysing land-use suitability and modelling land-use change. Results show that major changes in land-use have been observed in the past two to three decades in the study catchments. Model representation of the interaction between land-use change and water resources shows that changes in land-use influence hydrologic responses. These influences are especially pronounced during high- and low-flow seasons. Likewise, hydrologic processes and water resources availability influence land-use suitability and hence land-use change responses. Accounting for the dynamic feedback between land-use and hydrology thus produces improved knowledge that can better inform integrated natural resources management.
Download or read book Reservoir Sedimentation written by K. Mahmood and published by . This book was released on 1987 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The role of storage reservoirs in water resource development is described and estimated on a world wide basis. The physical phenomena related to reservoir situation are described to provide a basic understanding of the problem. Finally, a fairly completed survey is presented of the design and operational strategies that can be used to alleviate reservoir situation are described to provide a basic understanding of the problem.
Download or read book Establishing a catchment monitoring network through a participatory approach written by Victor M. Kongo and published by IWMI. This book was released on 2007-10-04 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaporation / Rain / Groundwater / Conservation tillage / Runoff / Stream flow / Flumes / Discharges / Hydrology / Surveys / Monitoring / Catchment areas / River basins
Download or read book Investigating Integrated Catchment Management Using a Simple Water Quantity and Quality Model written by Daniel Christoffel Hugo Retief and published by . This book was released on 2014 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Knowledge Review written by and published by . This book was released on 2002 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impact of land use on river basin water balance a case study of the Modder River Basin South Africa written by and published by IWMI. This book was released on 2006 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of reservoir sedimentation process using empirical and mathematical method written by A.M. Chalachew and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Sediment Load in Rivers and the Deposition of Sediment in Storage Reservoirs written by South Africa. Department of Water Affairs. Division of Hydrological Research and published by . This book was released on 1959 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Towards Integrated Catchment Management written by Materechera Fenji and published by LAP Lambert Academic Publishing. This book was released on 2014-02 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water resource management has become a pertinent issue of global environmental concern in response to the conditions of a growing population, increasing development and a limited freshwater supply. The department of water affairs (DWA) in South Africa highlights the importance of approaching management of water resources from a catchment perspective which forms the basis for a particular integrated approach to management called integrated catchment management (ICM). Researchers have described the implementation of ICM as being complicated and difficult. This is no exception to South Africa. principles of ICM have recieved widespread prominence in south africa as they have been incorperated into national water policy. Actual implemenation however is still in its infancy. Towards Integrated Catcheent Management explores a case study of ICM with respect to factors influencing implementation amongst different stakeholders in a South African context. The study aims to explore the theme of implementation of ICM within the context of the Gamtoos River Catchment (South Africa) with a view toward identifying and addressing challenges that may be more broadly applicable.
Download or read book Sediment Yield Modelling in the Upper Tsitsa Catchment Eastern Cape South Africa written by Simone Norah Pretorius and published by . This book was released on 2016 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mzimvubu River is the largest river in South Africa without a dam. The Department of Water and Sanitation has identified the Tsitsa River Catchment on the Mzimvubu River as a potential site for a water resource development. The soils in the Tsitsa Catchment are prone to extreme soil erosion, in particular gullying. The sediment generated from these gullies and other forms of erosion will have a detrimental effect on any water resource development. Changing climate and land use will also affect soil erosion dynamics and thus need to be considered before any development is planned in the catchment. Previous studies have mapped the gully systems in the catchment as well as used hydrological models to determine erosion from sheet and rill processes. However, these studies did not account for the effects of change in land use or climate. The mapping of the gullies was also done manually, which is extremely time-consuming and is susceptible to human error. This study aims to determine the sediment yield in the catchment under current and future climate and land use scenarios as well as develop a methodology to identify and map the gullies automatically in order to determine the rate of gully growth from a time series of images. The study had two main components, the first was to study gully erosion in the catchment. In the second section the sheet and rill aspects of erosion under various climate and land use changes were modelled. Using object-based image analysis (OBIA) on SPOT 5 images a methodology was created to automate the task of gully mapping. This was applied to two SPOT 5 data sets one from 2007 and the other from 2012 in order to determine the rate of gully growth over the five-year period. Various accuracy assessments were also conducted to assess the accuracy of the methodology. It was determined that the methodology had an overall accuracy of 98% for the 2012 image and 99% for the 2007 image. There was an overall increase in gully erosion in the catchment by 28% in the five-year period. The estimated sediment yield generated from the gullies ranged between 7 and 14 t/ha/yr. It was concluded that OBIA resulted in faster processing times and more objective classification results. The second part of the study used the Soil and Water Assessment Tool (SWAT) to determine the sediment yield from sheet and rill erosion. SWAT only considers sheet and rill aspects of erosion and disregards gully erosion thus both methods needs to be incorporated into the study in order to understand the complete dynamics of soil erosion in the catchment. SWAT was used to model the current land use and climate scenario using land cover data and observed weather data for the 2007-2012 period. On average 0.18 t/ha/yr of sediment is generated in the catchment from sheet and rill erosion. Using climate data from 1969 and projected to 2100, future sediment yield from sheet and rill erosion was estimated. The effects of possible land use change on sheet and rill erosion was also estimated by changing the land use component in SWAT into various crops that may be cultivated in the catchment over the next century. The results of the land use change showed that the current land use is optimal for minimal sheet and rill erosion and converting to maize crops will have the greatest impact on sediment yield This study aimed to understand the dynamics of soil erosion under current and changing land use and climate scenarios. It was concluded that the majority of the sediment is derived from gully erosion, which accounts for up to 70 times more sediment yield annually than sheet and rill erosion. Gully formation and propagation in the catchment is of critical concern to any land or water developments proposed for the Tsitsa Catchment.
Download or read book Estimating Sedimentation and Life Expectancy of Small Reservoirs Using Airborne Remote Sensing and GIS written by O.S. Diallo and published by . This book was released on 1997 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Philosophy and Practice of Integrated Catchment Management written by South African Council for Scientific and Industrial Research. Water Research Commission and published by . This book was released on 1996 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Individual and Organisational Behavioural Issues Relating to Water Resources Simulation Modelling and Its Role in Integrated Catchment Management in Southern Africa written by M. C. Dent and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Olifants written by South Africa. Department of Water Affairs and Forestry and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Philosophy and Practice of Integrated Catchment Management written by Waternavorsingskommissie and published by . This book was released on 1996 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
