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橡膠壩蓄水期問(wèn)，基本斷面處水面加寬，水位升高，水面比降接近于0，水道斷面面積加大，流速急劇衰減，斷面處基本處于死水狀態(tài)。但蓄水時(shí)基本斷而水位不斷升高，應該有流量通過(guò)，但此部分流量很小。用低速流速儀使用l1點(diǎn)法測流時(shí)表現為上層水流部分點(diǎn)子有微弱流速，下部極少點(diǎn)子有微弱流速，證明下部為死水。此種情況若用常規測流方案施測(水面一點(diǎn)法或0．60)必將造成流量過(guò)于偏大。個(gè)人建議應該應用5點(diǎn)法或1 1點(diǎn)法進(jìn)行流量測驗，這樣能客觀(guān)上保證流速垂向上正確分布，排除下部死水層的影響，較為準確的得到流量。 </p> <p style="text-indent:2em;"> 2 利用槽蓄變量法進(jìn)行推流<br /> 溢流時(shí)根據水流連續性原理，在距基本斷面一定距離且沒(méi)有支流等水量加入的地方選擇適當臨時(shí)斷面進(jìn)行測驗。蓄水期不再實(shí)測流量，記錄好開(kāi)始蓄水時(shí)間，待放水時(shí)記錄放水結束時(shí)間，通過(guò)基本斷面的流量在此期間利用河道槽蓄曲線(xiàn)查得蓄水變量進(jìn)行推流。將蓄水變量分攤到橡膠壩開(kāi)始蓄水時(shí)刻與放水結束時(shí)刻的時(shí)問(wèn)段內求得流量。這種方法要求了解橡膠壩開(kāi)始蓄水的時(shí)間及放水結束的時(shí)間，以及需要建立河道槽蓄曲線(xiàn)和壩上水尺。 </p> <p style="text-indent:2em;"> 3 靈活掌握測流時(shí)機<br /> 以橡膠壩為參照，蓄水開(kāi)始至蓄水滿(mǎn)，不再施測流量，待溢流或放水時(shí)及時(shí)施測流量。此法要求密切注視橡膠壩蓄水時(shí)刻、放水時(shí)刻及溢流時(shí)刻，把握測流時(shí)機。 </p> <p style="text-indent:2em;"> 4 遷移測驗斷面<br /> 為保證流量測驗精度及水量的控制，可以將原水文站測驗斷面進(jìn)行遷移，興建水文測驗設施?？蓪嗝孢w移至橡膠壩上游不受影響的地方或者將斷面遷移至橡膠壩下游測流。遷至下游時(shí)需要注意與橡膠壩的距離，距離過(guò)近，橡膠壩放水時(shí)水流急劇變化流態(tài)不穩，影響流量測驗及人員設施安全，應設置在水流平穩的地方。 </p> </div> <div id="4c0q2k0imcc" class="point"> <span id="4c0q2k0imcc" class="to_prev col-xs-12 col-sm-6 col-md-6">上一個(gè)問(wèn)題：<a href="/faq/322.html" title="橡膠壩的主要作用有哪些?">橡膠壩的主要作用有哪些?</a></span> <span id="4c0q2k0imcc" class="to_next col-xs-12 col-sm-6 col-md-6">下一個(gè)問(wèn)題：<a href="/faq/320.html" title="如何處理橡膠壩泵房頂板上的裂縫？">如何處理橡膠壩泵房頂板上的裂縫？</a></span> </div> </div> </div>  <div id="4c0q2k0imcc" class="col-xs-12 col-sm-4 col-md-3"> <div id="4c0q2k0imcc" class="left_nav" id="categories"> <h2 class="left_h2">產(chǎn)品列表</h2> <ul class="left_nav_ul" id="firstpane"> <li> <a href="/xiangjiaoba.html" title="橡膠壩">橡膠壩</a></li> <li> <a href="/yiyoufangzhixilie.html" title="溢油防治系列">溢油防治系列</a></li> <li> <a href="/qidunba.html" title="氣盾壩">氣盾壩</a></li> <li> <a href="/gangbanzha.html" title="鋼板閘">鋼板閘</a></li> </ul> </div> <div 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