نتایج جستجو برای: water level drawdown
تعداد نتایج: 1583581 فیلتر نتایج به سال:
Rising atmospheric [CO2 ], ca , is expected to affect stomatal regulation of leaf gas-exchange of woody plants, thus influencing energy fluxes as well as carbon (C), water, and nutrient cycling of forests. Researchers have proposed various strategies for stomatal regulation of leaf gas-exchange that include maintaining a constant leaf internal [CO2 ], ci , a constant drawdown in CO2 (ca - ci )...
In dam construction stages when an earth embankment has retained a reservoir with constant water surface elevation for long time, seepage conditions within the will be reach steady state. If it is necessary to drain quickly, pore-water pressures in may remain relatively high while stabling effect of reservoir's weight along upstream (U/S) side removed. This process referring as "Rapid Drawdown"...
Water tables are dropping by approximately one meter annually throughout the North China Plain mainly due to water withdrawals for irrigating winter wheat year after year. In order to examine whether the drawdown can be reduced we calculate the net water use for an 11 year field experiment from 2003 to 2013 where six irrigated crops (winter wheat, summer maize, cotton, peanuts, sweet potato, ry...
The study of groundwater resources using pumping test data is usually carried out with the Theis solution, which enables hydraulic parameters porous aquifers such as transmissivity and storage coefficient, to be estimated from water-level drawdown. However, fitting can fail provide only an indication that pumped aquifer has a complex structure. Here, diagnostic plot on log-derivative drawdown u...
In this article, we aim to explain what causes the depth of a stock market drawdown using discretionary global macro approach. Our key finding is that increase in credit risk high/very high level after beginning significantly explains drawdown. An expected aggressive monetary policy tightening can trigger correction, especially if accompanied with recession probability. Further, an easing, as s...
This study investigated the impact of atmospheric metal deposition on natural phytoplankton communities at open-ocean and coastal sites in the Sargasso Sea during the spring bloom. Locally collected aerosols with different metal contents were added to natural phytoplankton assemblages from each site, and changes in nitrate, dissolved metal concentration, and phytoplankton abundance and carbon c...
Suitable groundwater level is an important foundation for the stability of ecological environment, and healthy development social economy, in arid area Northwest China. The Manas River Basin a typical oasis area, where problems salinization desertification are prominent. By analyzing variation characteristics study from 2013 to 2019 combined with remote sensing technology—according theory capil...
This paper presents the results and assessment of groundwater exploitation reserves in coastal areas Ninh Thuan province. The research was based on determining all grid cells with dimensions 500 m × distributed fresh-salted water Holocene (qh) Pleistocene (qp) aquifers. Each assigned corrected hydrogeological parameter values (depth, gravity coefficient, hydraulic conductivity, drawdown level)....
The exploitation of shallow geothermal energy through a groundwater heat pump (GWHP) is always limited to thick and deep aquifers containing abundant water with a relatively stable temperature. Unfortunately, aquifers in hilly regions which occupy two thirds of China are usually thin and shallow. The boundary conditions in those hilly areas affect the groundwater flow that is used for geotherma...
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