جستجوی مقالات مرتبط با کلیدواژه "earth channel" در نشریات گروه "آب و خاک"

Groundwater is the main source of potable water for more than 1.5 billion people throughout the world, including arid and semi-arid regions like Iran. Literature review showed that there is no use of the dimensional similitude and physical modelling for estimating seepage from channels and its effect on the groundwater, yet. Thus, in order to better understand this phenomenon, the current study aimed at investigating the effects of infiltration and seepage on the groundwater recharge at different water level depths. Numerous studies have been conducted to assess the groundwater recharge, such as Yin et al. (2011) that utilized some methods such as the water table fluctuation method and the Darcian flux and water balance method in China. Similarly, using data from some irrigation projects and piezometric level data, Ochoa et al. (2013) evaluated the effects of seepage on the groundwater recharge in New Mexico. Moreover, Demlie (2015) compared the water balance method and the chloride mass balance method to quantify and investigate the groundwater recharge in Ethiopia. In the current research, the earth channel of Boldaji with loamy soil, located in Borujen city, Chaharmahal and Bakhtiari province, was chosen as the prototype. The dimensions of such a channel were transmitted to laboratory models at soil mechanics lab at Shahrekord University. Using dimensional similitude equations, 9 discharges (40-161 l/s) and 4 water-table depths (0.75, 0.8, 0.85 and 0.9 m from soil surface) were converted to the applicable discharges of the model. The results of the laboratory physical model showed that the infiltrated water raised the groundwater 3.5-11 cm. The values of recharged groundwater were, in turn, calculated by means of water balance method and the results showed no suitable estimates of such a method for the trapezoid and triangle cross-sections.

From the perspective of geotechnical engineering, increasing the stability of earth slopes into three general categories, mechanical methods, soil reinforcement and chemical methods, are divided. The geotechnical engineering researchers have been considered on the soil behavior modification to aid additives that is classified in chemical methods, always as one of the most effective methods for increasing the stability of the earth slopes. In this study, the effect of adding four materials sodium chloride, calcium chloride, lime and mixed of lime and bagasse ash at 5, 7.5 and 10 wt% during the curing period of 7 and 21 days, were studied. The results of this study showed that sodium chloride reduces the stability of earth slopes, and calcium chloride, lime and mixed of lime and bagasse ash enhance the stability of earth slopes. The results also showed that the curing period of 21 days compared to 7-day curing period is more effective in increasing or decreasing the stability of earth slopes.