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Danh sách kết quả tìm kiếm tài liệu từ 1 đến 10 trong 17 tài liệu phù hợp.
Tài liệu phù hợp với tiêu chí tìm kiếm:
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  • Tác giả: El-Shikha, D.; Eranki, P.L.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • This study, the first of its kind for guayule, compares the metrics of energy consumption, lifecycle environmental impacts and irrigation water productivity. Drip irrigation showed a more efficient use of the applied water by generating higher rubber (46%) and bagasse (dry matter) yields (49%) compared to flood irrigation. On the other hand, drip irrigation showed 13% higher energy consumption than flood because of the additional burdens of water pumping. Experimental field operations were the central contributor to energy consumption in both irrigation methods. By separating a crucial stage of guayule production, namely irrigation, connections emerge between various key parameters in the two irrigation methods; accordingly, the outcomes from the evaluation of these two irrigation s...

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  • Tác giả: Li, S.; Alun, G.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • This paper summarizes and analyzes the influences of coal mining and utilization on water resources. Quantitative indicators are used to quantify relevant influences and transform the influences from material amount to monetary amount to gain the summation of the influences in the entire process. Results show that mining of coal per ton generally causes depletion of 1.32 m3 water resources, pollution to 0.88 m3 water resources, and destruction of 0.17 m2 water ecological environment on the average, thereby making a comprehensive cost of approximately 50.61 yuan. Taking thermal power industry as an example, per-ton-coal utilization means depletion of water resources of 26.35 m3 and the comprehensive cost of 86.61 yuan. To utilize coal resources scientifically and to respond to the ob...

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  • Tác giả: Addor, N.; Etterm, S.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • Water resources in the Alps are projected to undergo substantial changes in the coming decades. It is therefore essential to explore climate change impacts in catchments with hydropower facilities. We found that the annual runoff dynamics will undergo significant changes with more runoff in winter and less in summer by shifting parts of the summer melt runoff to an earlier peak in spring. We furthermore found that the MDC reduces the uncertainty in the projections of glacial runoff and leads to a different distribution of runoff throughout the year than if calibrated to discharge only. We therefore argue that MDC leads to more consistent model results by representing the runoff generation processes more realistically.

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  • Tác giả: Duan, Q.; Xia, J.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • This paper addresses the impact of climate change on the water cycle and resource changes in the Eastern Monsoon Region of China (EMRC). It also represents a summary of the achievements made by the National Key Basic Research and Development Program (2010CB428400), where the major research focuses are detection and attribution, extreme floods and droughts, and adaptation of water resources management. Therefore, climate change is making a significant impact and will be a risk to the EMRC, which covers almost all of the eight major river basins, such as the Yangtze River, Yellow River, Huaihe River, Haihe River, and Pearl River, and to the South-to-North Water Diversion Project (middle line). To ensure water security, it is urgently necessary to take adaptive countermeasures and redu...

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  • Tác giả: Sechi, N.; Padedda, B.M.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • The aim of this study was to investigate possible management actions to control eutrophication and assure water use of a eutrophic deep Mediterranean climate reservoir, dominated by cyanobacteria. With this goal, we defined the trophic state of Lake Cedrino (Sardinia, Italy) and studied its phytoplankton, paying particular attention to cyanobacteria, and to seasonal variation of phytoplankton in relation to seasonal variation of environmental variables. On the base of lake features, we propose management actions at different scales and levels to resolve eutrophication and to allow water use: from nutrient load reduction in the watershed (primarily from point-sources) to deep water aeration, to immediately face an attenuation of eutrophic effects. This study is the first explorative ...

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  • Tác giả: Pederson, G.T.; McAfee, S.A.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • In this management-guided study, we use a very large suite of synthetic climate scenarios in a statistical modeling framework to simultaneously evaluate how (1) average temperature and precipitation changes, (2) initial basin conditions, and (3) temporal characteristics of the input climate data influence water-year flow in the Upper Colorado River. The results here suggest that existing studies may underestimate the degree of uncertainty in future streamflow, particularly under moderate temperature and precipitation changes. These results suggest that simple testing, like the analyses presented in this paper, may be helpful in understanding differences between existing studies or in identifying specific conditions for physically based mechanistic modeling. Both options could reduce...

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  • Tác giả: Jincai, Z.; Udimal, T.B.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • This study specifically looked at total water supply in China, water withdrawal from various sources and various usage of water. From the analysis, it was realized that water supply from the underground source contributes greatly to the total water supply in China, a cubic unit withdrawal in underground water results in about 45% increase in the total water supply. Water from other sources also contributes to the total water supply in China. The result shows that a cubic unit increase in withdrawals from other sources results in about 3% change in gross water supply in China. A cubic unit withdrawal of water for industrial use results in about 29% increase in water use in China. For the agriculture sector, the result shows that a cubic unit increase in agriculture usage leads to app...

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  • Tác giả: Oehler, T.; Moosdor, N.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • Terrestrial groundwater discharging directly into the sea (“fresh submarine groundwater discharge”, fresh SGD) is increasingly recognized as nutrient and pollutant pathway from land to coastal oceans. Here we present examples from a variety of places and from all available sources around the world to highlight that fresh submarine groundwater discharge is widely valued as a water resource for drinking, hygiene, agriculture, fishing, tourism, culture, or ship navigation. In Peru, fresh SGD is used for drinking, on Tahiti for bathing, in Greece for irrigation, in Bali for blessing, and already Alexander von Humboldt noted the danger for smaller vessels from a submarine spring off Cuba, but at which Manatees gathered and were hunted by fishermen. Because global change will strongly aff...

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  • Tác giả: Qin, D.; Wang, Y.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • This study reviews the latest progress in research on climate change and water resources in the arid region of Northwest China, analyzes the cause of water resource changes within the region from the perspective of climate change and human activities, and summarizes future likely changes in water resources and associated adaptation strategies. Recommendations for future studies are suggested that include characteristics of changes in extreme weather events and their impacts on water resources, projections of future climate and water resource changes, climate change attribution, the selection of adaptation strategies relating to climate change and social economic activities, and use of scientific methods to quantitatively determine water resource allocation.

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  • Tác giả: Xue, H.; Zhang, F.;  Người hướng dẫn: -;  Người tham gia: - (2017)

  • Resources and environmental constraints are important problems need to be solved in the process of industrial development, especially in the critical period of industrial transformation and upgrading in China. So the perspective of the restriction of water resources was selected to analyze the industrial growth path. The results show that it is possible to realize stable industrial development, but the ratio of water resources growth rate and the human capital growth rate should be less than the ratio of human capital output flexibility and water output flexibility. Meanwhile, water resources elasticity coefficient should be further increased to improve the contribution of unit water consumption for industrial growth, so the industrial water use efficiency be improved was one of the...