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Author: Javzansuren Norvanchig Publisher: ISBN: Category : Languages : en Pages :
Book Description
Water scarcity is a prevalent issue all over the world. Growing water abstractions combined with uncertain effects of climate increase competition for scarce water resources worldwide, especially in arid and semiarid regions. It is crucial to assess and manage available water resources to ensure its sustainability. There is a need for integrated water management at a watershed scale. Watershed models are a useful tool to support sustainable water management and investigate effects of hydrologic responses at various scales under climate change conditions and to simulate effects of the management decisions. This study aims to assess the sustainability of water resources in the Tuul River Basin in Mongolia using SWAT (Soil Water Assessment Tool) model to understand ecohydrological processes in the basin. The model is used to analyze the trends in water usage on a watershed and subwatershed basis. The water supply and demand dynamics at each sub watershed levels are analyzed to develop a sustainability index based on specific criteria of water sustainability. Sustainability index was used for better water management by targeting areas of the watershed. Using the analysis, strategies for water demand management for the Tuul River basin area were developed. I expect the results of the study with transform water resource situation in the region through better information on the dynamics of the system and will help in alleviating water issues in similar regions of the country and of the world. The model can be a useful tool to support decision makers and to simulate and analyze the effects of water management practices.
Author: Javzansuren Norvanchig Publisher: ISBN: Category : Languages : en Pages :
Book Description
Water scarcity is a prevalent issue all over the world. Growing water abstractions combined with uncertain effects of climate increase competition for scarce water resources worldwide, especially in arid and semiarid regions. It is crucial to assess and manage available water resources to ensure its sustainability. There is a need for integrated water management at a watershed scale. Watershed models are a useful tool to support sustainable water management and investigate effects of hydrologic responses at various scales under climate change conditions and to simulate effects of the management decisions. This study aims to assess the sustainability of water resources in the Tuul River Basin in Mongolia using SWAT (Soil Water Assessment Tool) model to understand ecohydrological processes in the basin. The model is used to analyze the trends in water usage on a watershed and subwatershed basis. The water supply and demand dynamics at each sub watershed levels are analyzed to develop a sustainability index based on specific criteria of water sustainability. Sustainability index was used for better water management by targeting areas of the watershed. Using the analysis, strategies for water demand management for the Tuul River basin area were developed. I expect the results of the study with transform water resource situation in the region through better information on the dynamics of the system and will help in alleviating water issues in similar regions of the country and of the world. The model can be a useful tool to support decision makers and to simulate and analyze the effects of water management practices.
Author: Enkhbayar Dandar Publisher: ISBN: Category : Languages : en Pages : 105
Book Description
Groundwater withdrawals are growing in most developing countries, including Mongolia, where freshwater resources are limited and unevenly distributed, and most surface waters are frozen during winter. Groundwater represents some 80% of the water supply in the country. Computation of recharge is important, but is complicated in cold regions, because of phase change and permafrost, which is found on 63 percent of the country, and causes conventional physically-based land surface models to be inaccurate. We have developed a two-compartment water and energy balance model that accounts for freezing and melting and includes vapor diffusion as a water and energy transfer mechanism. It also accounts for the effect of slope orientation on radiation, which may be important for mountain areas. We applied this model to the Upper Tuul River Basin to evaluate recharge under different soil and vegetation types. The basin is divided into 12 zones (models) based on elevation ranges, orientation and slope. Due to the limited number of observation data in this area, precipitation, air temperature and relative humidity were corrected as a function of elevation by means of lapse rates. Results show that recharge is relatively high and delayed with respect to snowmelt during spring, because it is mainly associated to thawing at depth, which may occur much later. Most importantly, we find that vapor diffusion plays an important quantitative role in the energy balance and a relevant qualitative role in the water balance. Except for a few large precipitation events, most of the continuous recharge is driven by vapor diffusion fluxes. Large vapor fluxes occur during spring and early summer, when surface temperatures are moderate, but the subsoil remains cold, creating large downwards vapor pressure gradients. Temperature gradients reverse in fall and early winter, but the vapor diffusion fluxes do not, because of the exponential shape of the saturated vapor pressure as a function of temperature giving smaller vapor pressure differences at lower temperature. The computed sensible heat flux is higher than the latent heat flux, which reflects the dry climate of the region. The downward latent heat flux associated to vapor diffusion is largely compensated by an upward heat conduction, which is much larger than in temperate regions. The alluvial aquifer around Ulaanbaatar supplies water to the city and is under pressure because of the growing water demand. To address this concern, we built a numerical model, which is challenging, not only because of the lack of data, but also because the river freezes during winter. River flow under the ice is sustained by groundwater, which provides the energy to prevent full freezing of the whole river thickness, but which may not occur where groundwater levels are depleted by pumping. At present, the river still flows under the ice during winter at both ends of the Ulaanbaatar alluvial aquifer. The downstream end, to the West, receives aquifer discharge, whereas the river is fed by discharge from adjacent alluvial aquifers upstream of the east end. But, in the central portion, the river is fully frozen. In fact, the river bed in this portion becomes dry in April most years, probably because of sublimation and because melted water immediately infiltrates into the aquifer. If groundwater pumping increases, either at the Ulaanbaatar alluvial aquifer or at the alluvial aquifer near Gachuurt village, it is likely that the currently winter flowing portion of the river will also dry or, rather, become fully frozen during winter. This will not be a major problem from a quantitative point of view because aquifer storage is sufficient to support winter pumping, even if pumping is increased. However, it may have other environmental and cultural implications. Therefore, further study is needed to monitor at both the upper and downstream stream parts of the aquifer.
Author: Publisher: Food & Agriculture Org. ISBN: 9789251047651 Category : Business & Economics Languages : en Pages : 92
Book Description
It is often assumed that upstream land use practices have important impacts on water resources and affect the downstream users at a watershed scale, Payments by downstream users to upstream users for "environmental services" such as good water quality, less sediments or more regular water flow are widely discussed. However, much controversy exists about the direction and magnitude of such impacts, how they influence the relationships between upstream and down-stream users, and which mechanisms allow for a sharing of resulting benefits and costs by all resource users in a watershed context. To address these issues, the FAO Land and Water Development Division organized the electronic workshop "Land-Water Linkages in Rural Watersheds" from 18 September to 27 October 2000. The present publication contains the proceedings of the workshop and two papers that set the stage for the workshop discussions. The complete workshop documentation, including discussion archive, background papers, and case studies, is included on the CD-ROM that accompanies the document.
Author: Kaveh Madani Publisher: ISBN: 9783639181180 Category : Watershed management Languages : en Pages : 104
Book Description
Within watersheds, social, economical, political and physical subsystems interact. While making decisions, decision makers should be aware of such interactions as any new policy will not only affect one subsystem. To see if a specific management policy is proper, an integrated study is needed of complicated water management system in the basin, considering major physical, social, economical and political aspects of it. System Dynamics provides a unique framework for integrating the disparate physical and social systems important to water resource management and can be used to comprehend the interaction of different drivers of the problem. Here, this approach is used to find, for different scenarios, how various options of demand management and population control can be more effective when combined with transbasin water diversions, increasing water storage capacity and controlling of groundwater withdrawal in the river basin. A simulation model is built based on Causal Loop Diagrams of the watershed problem to comprehend the dynamic and interrelated characteristic of the system, and convey experiences, lessons learned, and perceptions gained through the model development process.
Author: Walter Dragoni Publisher: Geological Society of London ISBN: 9781862392359 Category : Business & Economics Languages : en Pages : 200
Book Description
There is a general consensus that for the next few decades at least, the Earth will continue its warming. This will inevitably bring about serious environmental problems. For human society, the most severe will be those related to alterations of the hydrological cycle, which is already heavily influenced by human activities. Climate change will directly affect groundwater recharge, groundwater quality and the freshwater-seawater interface. The variations of groundwater storage inevitably entail a variety of geomorphological and engineering effects. In the areas where water resources are likely to diminish, groundwater will be one of the main solutions to prevent drought. In spite of its paramount importance, the issue of 'Climate Change and Groundwater' has been neglected. This volume presents some of the current understanding of the topic.
Author: Assefa Kumsa Publisher: LAP Lambert Academic Publishing ISBN: 9783659121401 Category : Eutrophication Languages : en Pages : 108
Book Description
The causes of water pollution in a watershed are attributed to various sources. The sources of such pollutants and their routing mechanism are controlled by several natural and anthropogenic factors. Such natural and human-induced complexities make the protection of pollution and hence water resource management too difficult. Therefore, extensive knowledge and information is required not only about the pollutants in concern but also the controlling factors within the environment at varying spatial and temporal scales. Description of the spatial and temporal variability of processes based on conventional measurements or observations, for example field sampling and analysis of stream water quality, to represent and explain the entire watershed is ineffective, expensive and time consuming increasing the intricacy on effective decision-making process. An integrated spatial approach that combines a watershed scale hydrologic models, remote sensing and GIS led to tremendous progress during the last few decades in alleviating such problems and demonstrated to be useful tool. This work showed the effectiveness of such tool in modelling the Rönne River basin in Sweden.
Author: Rattan Lal Publisher: CRC Press ISBN: 1420074423 Category : Nature Languages : en Pages : 416
Book Description
Focusing on the technical, social, and economic issues involved in watershed management, this interdisciplinary author team focuses on bettering land use practices and the condition of soil water resources. Integrated Watershed Management in the Global Ecosystem is a volume composed from an international symposium of the world's leading experts
Author: Javzansuren Norvanchig
Author: Javzansuren Norvanchig
Author: Enkhbayar Dandar
Author: 
Author: 
Author: Kaveh Madani
Author: J.G. Arnold And J.R. Williams
Author: Jeffrey G. Arnold
Author: Walter Dragoni
Author: Assefa Kumsa
Author: Rattan Lal