Research Journal of Environmental Sciences1819-34122151-8238Academic Journals Inc.10.3923/rjes.2009.232.238SedaghatkerdarA. SehatkashaniS. BidokhtiA.A. MajborianA.A. 2200932The aim of this study was to apply a hydraulic model
for the gap flow in the Sepeed Rood valley to assess the roles of factors
such as sea breeze affecting the flow in the gap. The valley is considered
as a narrow passage in Alborz mountain range in which the remarkable air
flow causes intensive winds in its route cities such as Rood Bar and Manjil.
Since the gap winds are considered as the condensed air flow in low levels
which are horizontally limited by the channel rims and vertically by temperature
inversion, it is similar to the flow in a channel and the hydraulic model
can be applied for it. The application of scale analysis indicates the
strength of F0 term related to the contribution of heat forcing
circulation such as sea breeze which plays a role for creating the winds
with the average daily velocity much bigger than the night most especially
in summer days. Moreover it indicates the validity of Bernoulli equation
application in winter most especially when the regional circulations are
weak and synoptic forcing is the dominant factor in the gap wind, while
in summer the effects of regional circulations such as sea breeze are
more noticeable.]]>Banta, R. and W.R. Cotton,19812012551266Dantels, P.A. and T.A. Schroeder,197817812818Jackson, P.L. and D.G. Steyn,199412226452665Jackson, P.L. and D.G. Steyn,199412226662676Lackmann, G.M. and J.E. Overland,198911718171833Liu, M., D.L. Westphal, T.R. Holt and Q. Xu,200012813091327Marvill, S. and K.O.L.F. Jayaweera,197510311291136Mass, C.F., S. Businger, M.D. Alberight and Z.A. Tucker,1995123315331Olson, J.B., B.A. Colle, N.A. Bond and N. Winstead,200713529732994Ramachandran, G., K.V. Rao and L. Krishna,198019881888Reed, T.P.,193959373376Romero, C. R., J. Z. Hidalgo and G.B. Raga,20072037683784Ryan, B.C.,197716571584Tyson, P.D. and R.A.P. White,197211643650