Safety of control gate for open channel water transfer project based on hydrodynamic coupling
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Abstract:
The?open?channel?water?transfer?project?is?an?important?means?to?solve?the?problem?of?regional?water shortage.?However,?during?the?operation?of?the?project,?the?upstream?flow?changed?frequently?due?to?the?variable demand?for?water?supply?along?the?line,?resulting?in?complex?and?changeable?water?conditions?along?the?line.?The control?gate?is?one?of?the?main?control?buildings?in?the?water?transfer?project?and?the?water?level?in?front?of?the?gate is?the?key?object?of?that?needs?the?dispatcher?to?pay?attention?to.?If?the?regulation?is?not?proper,?the?water?level?may exceed?the?limit,?which?not?only?poses?a?threat?to?the?safe?operation?of?the?water?transfer?project?but?also?affects?the efficient?water?supply?of?the?project.?Therefore,?it?is?of?great?significance?to?study?the?safety?regulation?of?control gates?in?open?channel?water?transfer?project. ??????To?solve?the?problem?that?the?water?level?in?front?of?the?gate?breaks?and?the?upper?and?lower?limits?of?the?water level?due?to?improper?regulation?during?flow?switching?in?an?open?channel?water?transfer?project,?the?concept?and transfer?principle?of?the?feasible?area?of?safety?regulation?and?control?of?the?gate?control?system?in?open?channel water?transfer?project?is?proposed.?The?control?scheme?of?the?control?gate?is?calculated?based?on?the?dichotomy- coupled ?one-dimensional ?hydrodynamic ?model. ?The ?regulation ?opening, ?safe ?water ?level, ?and ?regulation ?time interval ?of ?the ?control ?gate ?are ?calculated ?during ?flow ?switching. ?The ?model ?can ?quickly ?calculate ?the ?control opening,?safe?water?level,?and?control?time?interval?of?the?control?gate?when?the?upstream?flow?is?switched,?and?the feasible?domain?and?control?scheme?of?the?control?gate?was?obtained. ??????Four?control?gates?from?the?first?Taocha?Canal?to?the?Qi?River?in?the?Middle?Route?of?the?South-to-North?Water Transfers?Project?were?studied,?and?12?working?conditions?were?set?respectively?for?calculation.?The?results?showed that?when?the?upstream?flow?changes,?the?interval?regulation?scheme?calculated?by?the?model?could?strictly?control the?water?level?within?the?safety?water?level?interval,?and?the?transfer?principle?of?the?safety?water?level?interval played?a?role?in?reducing?the?amplitude?of?the?water?level.?The?calculation?speed?of?the?model?was?fast.?CUP_TIME function?in?Fortran?was?called?to?test?each?working?condition,?and?the?maximum?calculation?time?was?8.99?s. ??????The?control?scheme?calculated?by?the?model?makes?the?scheduling?more?flexible?and?practical?and?can?reduce?the operation?error?of?the?scheduler.?The?calculation?speed?of?the?model?can?meet?the?regulation?demand?of?sudden change?of?flow?in?the?middle?and?upper?reaches?of?the?project.?In?the?project,?upstream?flow?monitoring?can?be?used to?judge?flow?changes.?By?calculating?the?scheduling?scheme?of?each?control?gate,?the?effect?of?multi-gate?cascades can?be?realized.?It?provides?support?for?the?dispatching?decision?of?the?water?transfer?project?and?has?important significance?for?maintaining?the?smooth?operation?of?the?water?transfer?project.
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