انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 1 2011 05 22 Hydraulics of Flow over the Weir of Subsurface Dams بررسی رفتار هیدرولیکی جریان در سرریز سدهای زیرزمینی 19 39 85502 10.30482/jhyd.2011.85502 FA محمدرضا شمس عبدالرضا کبیری سامانی دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی اصفهان 0000-0002-5984-3892 محمدکریم بیرامی حمیدرضا صفوی Journal Article 2011 03 23 One of the most substantial water resources in water engineering is the groundwater, stored in<br />aquifers. In arid and tropical regions having monsoon climate, the groundwater accumulated under the<br />ground and used later during dry seasons. The use of subsurface dams in aquifers to store water behind<br />the dam is one of the common techniques in recent years. But a weir should be constructed in<br />subsurface dam body to convey the excess water from the aquifer. Without an appropriate weir to<br />withdraw the excess water, groundwater level will reach the ground surface and in addition to<br />disrupting the lands application, will cause inevitable damages to the environment. In this study, the<br />effects of characteristics of weir together with the aquifer hydrodynamic properties on groundwater<br />flow discharge are studied. The effects of different hydraulic parameters on the flow rate through the<br />weir of the dam are also investigated. An experimental model of the aquifer, including underground<br />reservoir, dam and weir is built and the effects of different parameters such as hydraulic conductivity<br />of the aquifer, head above the weir, height of the weir and weir crest length on the discharge through<br />the weir in steady state condition are tested. The results show that increasing the hydraulic<br />conductivity of the aquifer, yields an increase of the flow discharge. By increasing the weir height, the<br />head above the weir or the weir crest length, the discharge increases. In order to evaluate all the<br />influential parameters and analyze their effects on flow discharge through the subsurface weir, the<br />Seep3D software is used. The results of numerical models are verified using the measured data. Then<br />different models of underground dams and were prepared and the effect of each influential parameter<br />on the groundwater discharge through the weir was studied. Results of numerical models showed that<br />the hydraulic conductivity of aquifer, head above the weir and the effective width of the aquifer are the<br />most significant parameters to establish a certain groundwater discharge through the weir. https://jhyd.iha.ir/article_85502_0c51534b6de8deb91d21f931c3554b0a.pdf