نتایج جستجو برای: numerous water resources

تعداد نتایج: 919281  

2002
Shaleen Jain Connie A. Woodhouse Martin P. Hoerling

[1] In the interior western United States, increased demand for water coupled with the uncertain nature of anthropogenic and natural hydroclimatic variations add challenges to the task of assessing the adequacy of the existing regional water resources systems. Current availability of relatively short instrumental streamflow records further limits the diagnosis of multidecadal and longer time va...

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2012
Yao-Huan Huang Dong Jiang Da-Fang Zhuang Jian-Hua Wang Hai-Jun Yang Hong-Yan Ren

Enhancing water use efficiency (WUE) is the key approach to maintain sustainable water resource supply. Due to the complexity of the water cycle, accurate estimation of WUE at the regional scale is a challenging task. Here we presented a framework of relative water use efficiency (RWUE). According to the linkage between RWUE and land use types, assessment of WUE at a regional scale could be per...

Journal: :Science 2005
Christer Nilsson Catherine A Reidy Mats Dynesius Carmen Revenga

A global overview of dam-based impacts on large river systems shows that over half (172 out of 292) are affected by dams, including the eight most biogeographically diverse. Dam-impacted catchments experience higher irrigation pressure and about 25 times more economic activity per unit of water than do unaffected catchments. In view of projected changes in climate and water resource use, these ...

2016
Douglas Aitken Diego Rivera Alex Godoy-Faúndez Eduardo Holzapfel

Chile contains some of the driest areas in the world, yet human activities in these areas require large volumes of water, the result is regions experiencing high water scarcity leading to environmental degradation, conflicts and reduced industrial productivity. The aim of this paper was to quantify the water scarcity in the central and northern regions by calculating the water scarcity index—th...

2014
Hongna Li Zhiwei Shi Changxiong Zhu

This paper presented a detailed chronological survey of scientific output related to electrochemical oxidation in SCI categories of “environmental sciences, environmental engineering and water resources” from 1975 to 2012. Publications were analyzed by distribution of the number of publications and times cited, source categories, source journals, author keywords,

Journal: :Water science and technology : a journal of the International Association on Water Pollution Research 2003
F Schlaeger H Schonlau J Köngeter

In this paper a concept of an integrated water quality model for a river catchment area is presented. The main focus is directed to the development of a water quality module for rivers. Necessary simplifications for calculation of hydraulics and water quality will be explained. Furthermore, by first simulation results possible applications of the model are presented.

2017
Mayank N. Vahia Nisha Yadav Uma Ladiwala Deepak Mathur

A diffusion equation has been used to study migration of early humans into the South Asian subcontinent. The diffusion equation is tempered by a set of parameters that account for geographical features like proximity to water resources, altitude, and flatness of land. The ensuing diffusion of populations is followed in time-dependent computer simulations carried out over a period of 10,000 YBP....

2013
Ruth Magnolia Martínez-Peña Almira L. Hoogesteijn Stephen J. Rothenberg María Dolores Cervera-Montejano Julia G. Pacheco-Ávila

Cleaning products are associated with many health and environmental problems. Contamination of water resources by cleaning products is more likely to occur with septic tanks as sewage treatment systems especially in karstic terrains. We explored women's ideas about water sources and the risk cleaning products pose to health and sewage in Mérida, a city in the Yucatán peninsula of Mexico. Women ...

2005
Van Dijk M. Gilfedder J. Gallant

Native vegetation clearing has created salinity problems in many parts of Australia. Reforestation has the potential to reduce salinity, but also reduces stream flow and this is a cause of concern. Spatial predictions of the stream flow and salinity impacts of reforestation are needed to assess the ability to achieve salinity and water resource targets. Unfortunately, our ability to predict sal...

2017
Houquan Lu Yihua Wu Yijun Li Yongqiang Liu

Article history: Received 17 September 2016 Received in revised form 22 January 2017 Accepted 11 March 2017 Available online 14 March 2017 This manuscript was handled by K. Georgakakos, Editor-in-Chief, with the assistance of Carlos Jimenez, Associate Editor

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