流量和坡度對植被水流水動力學(xué)特性的影響
發(fā)布時間：2019-01-04 20:28
【摘要】：為深入揭示植被覆蓋下坡面流阻力的內(nèi)在規(guī)律,系統(tǒng)研究了植被覆蓋度為32.32%時6個坡度和12個流量組合下坡面流的流動特性。結(jié)果表明:坡面流速隨流量的增大而增大,該覆蓋度下流態(tài)指數(shù)值接近1;坡面流從層流變化成過渡流,最后發(fā)展成紊流狀態(tài),但植被覆蓋下坡面流的層流狀態(tài)與明渠定義的不同;阻力系數(shù)隨流量的增大而增大,流量是影響阻力的主要因素,而坡度對其影響可以忽略;阻力系數(shù)隨平均水深和壅降差的增大而增大,壅降差不僅能代表水深對阻力系數(shù)的影響,而且能反映植被前壅水和后尾水旋渦的形成程度。
[Abstract]:In order to reveal the inherent law of slope flow resistance under vegetation cover, the flow characteristics of slope flow under the combination of 6 slopes and 12 flows with vegetation coverage of 32.32 were systematically studied. The results show that the flow velocity increases with the increase of flow rate, and the value of flow state index under this coverage is close to 1. The slope flow changes from laminar flow to transitional flow, and finally develops into turbulent state, but the laminar flow state of slope flow under vegetation cover is different from the open channel definition. The resistance coefficient increases with the increase of the flow rate, and the flow rate is the main factor affecting the resistance, but the influence of the slope on it can be neglected. The drag coefficient increases with the increase of the average water depth and the drop difference of the backwater, which can not only represent the influence of the water depth on the drag coefficient, but also reflect the formation degree of the vortex in the backwater before vegetation and in the rear tail water.
【作者單位】： 西北農(nóng)林科技大學(xué)水利與建筑工程學(xué)院;中國科學(xué)院水利部水土保持研究所黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點試驗室;
【基金】：國家自然科學(xué)基金資助項目(51579214,51209222,41001159) 國家“973”計劃項目(2015CB040441) 國家級大學(xué)生科技創(chuàng)新訓(xùn)練計劃項目(201410712082) 黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點實驗室開放基金資助項目(K318009902-1413) 流域水循環(huán)模擬與調(diào)控國家重點實驗室開放基金資助項目(IWHR-SKL-2014)
【分類號】：S157
本文編號：2400757
[Abstract]:In order to reveal the inherent law of slope flow resistance under vegetation cover, the flow characteristics of slope flow under the combination of 6 slopes and 12 flows with vegetation coverage of 32.32 were systematically studied. The results show that the flow velocity increases with the increase of flow rate, and the value of flow state index under this coverage is close to 1. The slope flow changes from laminar flow to transitional flow, and finally develops into turbulent state, but the laminar flow state of slope flow under vegetation cover is different from the open channel definition. The resistance coefficient increases with the increase of the flow rate, and the flow rate is the main factor affecting the resistance, but the influence of the slope on it can be neglected. The drag coefficient increases with the increase of the average water depth and the drop difference of the backwater, which can not only represent the influence of the water depth on the drag coefficient, but also reflect the formation degree of the vortex in the backwater before vegetation and in the rear tail water.
【作者單位】： 西北農(nóng)林科技大學(xué)水利與建筑工程學(xué)院;中國科學(xué)院水利部水土保持研究所黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點試驗室;
【基金】：國家自然科學(xué)基金資助項目(51579214,51209222,41001159) 國家“973”計劃項目(2015CB040441) 國家級大學(xué)生科技創(chuàng)新訓(xùn)練計劃項目(201410712082) 黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點實驗室開放基金資助項目(K318009902-1413) 流域水循環(huán)模擬與調(diào)控國家重點實驗室開放基金資助項目(IWHR-SKL-2014)
【分類號】：S157
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