Hebei Province Mud Quality River Mouth Is Incorporated Tide Rush Silt Add Drag Silt Prevent Silt Test Research

There are tide-block sluices in a lot of coastal river mouths of our country,because close gate for a long tim.e, influence by tide, river influence to prevent floodsafe river seriously under the floodgate. Seek economic, reasonable, objectivesolution, the effective measure that river mouth silts up is a very important withurgent task. A lot of scientific research and production unit have carried on a largeamount of research, have propound a lot of methods .This thesis combines the current situation of the river mouth of Hebei on thebasis of the thing that observed the materials in mud quality prototype of river mouthbefore, have analysed the hydrology silt characteristic of the mud quality rivermouth of Hebei and depositted the law , have propound the new method that " thegate is not controlled , receive the tide at the time of rising tide , drags the silt fromupper and low reaches of the floodgate at the time of the ebb tide ".Main conclusion:(1) After building the tide-block sluice in the river mouth , because make theflow of letting out to reduce in the river , the tide wave such reasons as the influenceout of shape ,etc., it is inevitable to deposit in the upper and lower rivers of thefloodgate.(2) Hebei argillaceous river mouth is it receive tide method to wash silt canachieve river mouth defend silt purpose to make a reduction of silt to adopt, it is thatone kind is effectual, the method of the easy maintenance river mouth .(3) Hebei argillaceous river mouth receive tide wash silt way should is it controlgate promptly to " transfer to flow and receive tide the way in which the tide washesthe silt naturally " to use, the gate is not controlled , receive the tide at the time ofrising tide , drags the silt from upper and low reaches of the floodgate at the time ofthe ebb tide. Receive tide enter floodgate visit silt of river deposit in front offloodgate probably 1KM to be about mainly, so should rely mainly on the fact that infront of the floodgate to tow the silt on the floodgate , should not be assigned theriver mouth under the floodgate. Should consider influenced of season , weather ,etc.while receiving the tide opportunity.(4) Receiving the tide must receive the sand , in order to reduce the influencewhich traces back the tidewater , adopt the upper reaches to set up the coffer. But towider saline and alkaline beach to entering the tide-block sluice of river mouth enterthe sea in Hebei, trace back the tidewater and have a little effect on two sides, withthe adjustment of the feeding in addition, is it need tidewater to the upper reaches ofcoastal, do not set up coffer receiving the tide for the reason, is it open mouth receivethe tide to adopt.(5) And river section form wide beach dark river mouth of trough to shortirrigation channel, suitable for with receive tide add towards silt method to delay siltis it maintain to come especially.