Results 291 to 300 of about 473,404 (341)

Groundwater in slopes

2012
Groundwater flows in the pores and fractures of soils and rocks, driven by changing mechanical and environmental boundary conditions, for example air temperature, humidity, and precipitation. Because the groundwater environment continuously changes, the steady--state condition is only a theoretical concept: the movement of water in soils and rocks is ...
PICARELLI, Luciano, LEROUEIL S, OLIVARES, Lucio, PAGANO L, TOMMASI P, URCIUOLI G.   +5 more
openaire   +5 more sources

Groundwater control by groundwater lowering

Geological Society, London, Engineering Geology Special Publications, 1986
ABSTRACT When an excavation is to extend beneath the water table the ground conditions may be improved by lowering the level of the water table beneath the proposed base of the excavation. Groundwater lowering is accomplished by removing water from the ground at a faster rate than recharge can occur.
P.M. Cashman, F. G. Bell
openaire   +2 more sources

The changing nature of groundwater in the global water cycle

Science
In recent decades, climate change and other anthropogenic activities have substantially affected groundwater systems worldwide. These impacts include changes in groundwater recharge, discharge, flow, storage, and distribution.
Xingxing Kuang, Junguo Liu, Bridget R Scanlon, J. Jiao, S. Jasechko, M. Lancia, B. Biskaborn, Y. Wada, Hailong Li, Zhenzhong Zeng, Zhilin Guo, Yingying Yao, T. Gleeson, J. Nicot, Xin Luo, Yiguang Zou, Chunmiao Zheng   +16 more
semanticscholar   +1 more source

Groundwater vulnerability or groundwater pollution risk?

Rendiconti Online della Società Geologica Italiana, 2016
This short note presents the complexity behind the definition of groundwater vulnerability and the vulnerability assessment methods. Although intrinsic and specific vulnerability are unanimously accepted concepts, and risk assessments are widely performed to protect groundwater from contamination, the development of new techniques to estimate ...
openaire   +3 more sources

Groundwater Age and Groundwater Age Dating

Annual Review of Earth and Planetary Sciences, 2008
A new way of thinking about groundwater age is changing the field of groundwater age dating. Following a rigorous definition of age, a groundwater sample is seen not as water that recharged the flow regime at a point in the past, but as a mixture of waters that have resided in the subsurface for varying lengths of time.
Thomas M. Johnson, Craig M. Bethke
openaire   +2 more sources

Statistical and multivariate statistical techniques to trace the sources and affecting factors of groundwater pollution in a rapidly growing city on the Chinese Loess Plateau

Human and Ecological Risk Assessment, 2020
Groundwater quality is defined by various water quality parameters. The aims of the research are to understand the relationships among different groundwater quality parameters and to trace the sources and affecting factors of groundwater pollution via ...
Jianhua Wu, Peiyue Li, Dan Wang, Xiaofei Ren, Miaojun Wei   +4 more
semanticscholar   +1 more source

Evaluation efficiency of hybrid deep learning algorithms with neural network decision tree and boosting methods for predicting groundwater potential

Geocarto International, 2021
Delineation of the groundwater’s potential zones is a growing phenomenon worldwide due to the high demand for fresh groundwater. Therefore, the identification of potential groundwater zones is an important tool for groundwater occurrence, protection, and
Yunzhi Chen, Wei Chen, S. Pal, A. Saha, Indrajit Chowdhuri, Behzad Adeli, Saeid Janizadeh, A. Dineva, Xiaojing Wang, Amir Mosavi   +9 more
semanticscholar   +1 more source

The Groundwater Challenge

2008
Groundwater is the most extracted natural resource in the world. It provides more than half of humanity’s freshwater for everyday uses such as drinking, cooking, and hygiene, as well as thirty percent of irrigated agriculture and industrial development.
openaire   +3 more sources

Groundwater Pricing and Groundwater Markets

2018
There are several general principles involved in assessing the economic value of water and the costs associated with its provision. First, an understanding of the costs involved with the provision of water, both direct and indirect, is key. Second, from the use of water, one can derive a value, which can be affected by the reliability of supply, and by
openaire   +2 more sources

Global water resources and the role of groundwater in a resilient water future

Nature Reviews Earth & Environment, 2023
B. Scanlon, S. Fakhreddine, Ashraf Rateb, Inge E. M. de Graaf, J. Famiglietti, T. Gleeson, R. Grafton, E. Jobbágy, S. Kebede, S. Kolusu, L. Konikow, Di Long, M. Mekonnen, H. Schmied, Abhijit Mukherjee, A. MacDonald, R. Reedy, M. Shamsudduha, C. Simmons, Alexander Y. Sun, Richard Taylor, K. Villholth, C. Vörösmarty, Chunmiao Zheng   +23 more
semanticscholar   +1 more source