Do you want to publish a course? Click here

Groundwater movement toward subsurface drains located between two different levels surface water

حركة المياه باتجاه المصارف المعطاة في الأراضي الواقعة بين منسوبين مختلفين للمياه السطحية

1008   0   367   0 ( 0 )
 Publication date 2017
  fields Civil Engineering
and research's language is العربية
 Created by Shamra Editor




Ask ChatGPT about the research

The high levels of groundwater at riparian rivers or lakes adversely affect the foundations of the engineering facilities which established in these areas, in terms of the corrosion of the reinforced concrete of the foundations, and on the other hand the difficulty of doing the engineering work required. Therefore it is necessary to reduce the levels of groundwater beneath the level foundation. In this research, the groundwater movement toward two coastal drains located at different levels has been studied numerically.

References used
MIELCARZEWICZ ,E. 1971 - Melioracje terenow miejskich i przemysowych , arkady Warszawa
حسن، عز الدين، فويتي، فاطمة، 1996 - الري والصرف، مديرية الكتب والمطبوعات الجامعية ، جامعة تشرين ، كلية الهندسة المدنية.
rate research

Read More

This is a study of free groundwater level changes through time, and the level of its being affected by natural and artificial factors, which allows evaluating general water situation of the aquifer. This study shows that groundwater system in the stu dy area from the type of water division line (climatic system) connects in direct connection with infiltration from rainfalls in which the natural factors (recharge) play the main role in forming the system of groundwater, in addition to the artificial factors (irrigation), and these factors yield three periods of the obvious terminal changes of the levels in hydrologic year (descending, stability, ascending). However, groundwater is renewable because of stability in the situations of this water, and its discharge to hydrodynamic net of groundwater in Al-kabir al-shimali and Al-snobar rivers and in the Mediterranean Sea as well.
Aim of the study was To Compare the efficiency of R ProTaper and R-Endo retreatment files in the removal of conventional gutta-percha and resin coated gutta-percha and time required. 60 extracted single root premolars were selected, and then divi ded into two groups according to the obturation material. Next, each group was divided into two groups according to the methods of retreatment.
The provision of adequate drainage and the accompanying problem of accumulation of salt in soil have plagued irrigated agriculture for centuries. Soil salinity is one of the major problems in arid and semi-arid zones. In Euphrates valley the high groundwater level and its high evaporation rate caused a serious salinity problem. This study was aimed to allocate the dangerous areas in terms of high water level resulted from the recent and expected activities. Drainage wells will be drilled at these areas in order to lower the groundwater level and prevent further soil salinity.
The research area is located in the Syrian coast between the Sin and Rous river. This research aims at studying the hydrogeological characteristics of the unconfined aquifer in the research area and evaluating the conditions of its placed. The rese arch was based on a monitoring network consisting of 36 wells that penetrate the unconfined aquifer, and measurements continued during the period (October 2016 until September 2017). The unconfined groundwater depths in the research area range between 0.5-11.5 m, and sometimes during the drought period reach to 13.5 m, while it is close to the surface in the winter and up to 0.1m in some wells. The electrical conductivity ranges between 550-3700 μs/cm, increasing as we go west and reaching 9,000 μs/cm and more in the wells near the sea during the dry period. Groundwater levels Lower in the dry period to below sea level in near-shore wells, achieves the hydrodynamic conditions of the seawater intrusion.
Groundwater is one of the major sources of exploitation in arid and semi-arid regions, Thus for protecting groundwater quality, data on spatial and temporal distribution are important. Geostatistics methods are one of the most advanced techniques f or interpolation of groundwater quality. In this research, IDW, Kriging methods were used for predicting spatial distribution of nitrate NO3 -. Data were taken from 21 wells study within eastern Damascus's Ghouta. After normalization of data, variograme was drawn. The less RSS was used, so Spherical model was the best. By using cross-validation and RMSE, the best method for interpolation was selected; Results showed that Kriging method is superior to IDW method. there is a big spatial dependence for nitrate variable that amounts to 2.2 %. Finally, maps of distribution of nitrate in groundwater were executed by Kriging method, in addition to executed maps that show goodness of groundwater for drinking and irrigation. Then it was prepared map of Probability Map of nitrate at threshold 50 mg/l.
comments
Fetching comments Fetching comments
Sign in to be able to follow your search criteria
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا