تعيين سرعت جريان آب در سازه هاي متخلخل سيگدانه اي و پاره سنگي براي كنترل سيل و آبخيزداري

Determination of water flow velocity in rockfill and stone structures for design of flood control

Laboratory experiments are required to carried out hydraulic analysis in rock fill and stone porous structures. Many scientists have released various formula on the base of less works. They presented relationships between characterestics of porous media and loss of energy. Those relations are divided in 3 groups: 1) Binominal Forchheimer, 2)Wilkins formula and 3)Linquists simulation[letter sigma]. The second includes simplest Relation between flow velocity (Vv) with flow gradient(i). In the present work, a relation has been developed based on Wilkin formula as well as many laboratory tests on relative crushed and non-crushed stone media. According to these relations if the mean diameter and standard deviation of stones are known, the designer can select appropriate relationship between velocity and gradient. The results show that the correlation coefficient and significance level are 0.993 and 0.001 respectively .