نتایج جستجو برای: groundwater balance

تعداد نتایج: 168953  

2017
Weiwei Shao Jinjun Zhou Jiahong Liu Haixing Zhang Jianhua Wang Chenyao Xiang Guiyu Yang Yun Tang

The comprehensive treatment project of groundwater over-exploitation in Hebei Province has been implemented for more than a year, and the effect of exploitation restriction is in urgent need of evaluation. This paper deals with Cheng'an County of Hebei Province as the research subject. Based on collected hydro-meteorological, socioeconomic, groundwater, and other related data, together with typ...

2011
Xiao Liang Pieter van Dijk

Since groundwater is diminishing rapidly in rural Beijing, rainwater harvesting for irrigation is being promoted. As the cost of pumping up groundwater is low, farmers have few incentives to use rainwater. To promote the consumption of rainwater, the Beijing Water Authority may in the future raise the cost of using groundwater by introducing a charge. Higher cost of groundwater will increase th...

2016
Brian F. Thomas Ali Behrangi James S. Famiglietti Thomas M. Missimer

Episodic recharge as a result of infrequent, high intensity precipitation events comprises the bulk of groundwater recharge in arid environments. Climate change and shifts in precipitation intensity will affect groundwater continuity, thus altering groundwater recharge. This study aims to identify changes in the ratio of groundwater recharge and precipitation, the R:P ratio, in the arid southwe...

2008
Megan B. Young Meagan Eagle Gonneea Derek A. Fong Willard S. Moore Jorge Herrera-Silveira Adina Paytan

Radium isotopes (Ra, Ra, Ra, and Ra) and water chemistry were used to identify two chemically distinct sources of submarine groundwater discharge (SGD) in Celestún Lagoon, Yucatán, Mexico. Low salinity groundwater discharging from springs within the lagoon has previously been identified and extensively sampled for nutrient concentrations. However, a second type of groundwater discharging into t...

2004
Xi Chen Qi Hu

Soil hydrological processes play an important role in land-atmosphere system. In most climate models, these processes are described by soil moisture variations in the first 2 m of soil resulting from precipitation, evaporation, and transpiration. Groundwater effects on soil moisture variations and surface evaporation are either neglected or not explicitly treated. Although groundwater may have ...

2016
Jin-Yong Lee Kideok D. Kwon David K. Kreamer

Korea has been operating groundwater monitoring systems since 1996 as the Groundwater Act enacted in 1994 enforces nationwide monitoring. Currently, there are six main groundwater monitoring networks operated by different government ministries with different purposes: National Groundwater Monitoring Network (NGMN), Groundwater Quality Monitoring Network (GQMN), Seawater Intrusion Monitoring Net...

Journal: :Water 2021

Because of the nitrogen pollution problem in groundwater, migration conversion mechanism groundwater level fluctuations was analyzed. Technology and methods through indoor experiments theoretical analysis were used to study coarse sand, medium fine sand fluctuation aeration zone saturated under situation distribution characteristics, revealing with mechanism. The experimental results showed tha...

Journal: :Entropy 2014
Wei Xu Shanghai Du

The groundwater flow system is typical dissipative structure system, and its evolution can be described with system information entropies. The information entropies of groundwater in Shijiazhuang City had been calculated between 1960 and 2005, and the results show that the entropies have a decreasing trend throughout the research period, and they can be divided into our stages based on the grou...

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