000			a
999			_c8535 _d8535
003			OSt
005			20190316110229.0
008			190316b xxu||||| |||| 00| 0 eng d
040			_aAIKTC-KRRC _cAIKTC-KRRC
100			_98081 _aSheeraz Ameen
245			_aEffects of geometricla and flow rates on the predication of bottom pressure coefficients of tunnel lift gate of dams
250			_aVol. 99(4), December
260			_aKolkata _bSpringer _c2018
300			_a741-749p.
520			_aHydrostatics and hydrodynamics forces are generated and applied on the vertical lift tunnel gates due to the influence of a wide range of dam operating conditions. One of the most important forces is the uplift force resulting from the jet flow issuing below the gate. This force is based mainly upon many hydraulic and geometrical parameters. In this work, the uplift force is studied in terms of bottom pressure coefficient. The investigation is made paying particular attention on the effects of various three discharges and three gate lip angles on values of bottom pressure coefficients in addition to four different tunnel longitudinal slopes whose impact has not been studied in many previous works. Hydraulic model is constructed in this work for the sake of measuring all parameters required for estimating the bottom pressure coefficients, which are all examined against gate openings. The results show that the bottom pressure coefficient is related to the said variables, however, its behaviour and values are not necessary regular with variance of studied variables. The values are seen more significantly related to the flow rates and for some extent to the slopes of tunnel. An attempt by using the nonlinear regression of Statistical package of social sciences (SPSS) is made to set equations relating bottom pressure coefficient with gate openings for several angles of gate lips. The obtained equations are shown in good agreement with the selected cases of experimental results. The results are applicable for design purposes for similar geometrical and flow parameters considered in this study.
650		0	_94621 _aCivil Engineering
700			_98082 _aTaha Taher
700			_98083 _aThamir M. Ahmed
773	0		_tJournal of the institution of engineers (India) Series A _x2250-2149 _dDordrecht Springer
856			_uhttps://link.springer.com/article/10.1007/s40030-018-0313-8 _yClick here
942			_2ddc _cAR