| 孙小利,王建跃,Allen Thompson.用环形断面管流模拟多年生植物的人工湿地的水头损失[J].水利学报,2011,42(8): |
| 用环形断面管流模拟多年生植物的人工湿地的水头损失 |
| Simulation of head loss in constructed wetlands with plants by using annulus flow |
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| DOI： |
| 中文关键词: 环形断面管流 植物根系 水头损失 石质介质 孔隙率 |
| 英文关键词: annulus flow plant root rock bed head loss porosity |
| 基金项目: |
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| 摘要点击次数: 3313 |
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| 中文摘要: |
| 此项研究对填有石质介质和生长植物根系的两个水槽进行了连续4年的露天水流和孔隙率实验研究。石质介质分别为大颗粒的卵石和小颗粒豆粒砾石。为了更准确计算成熟人工湿地渗流的水头损失，利用环形断面管流的假设来改进欧根 （Ergun） 方程紊流项，再对人工湿地的石质介质和植物根系的水流水头损失进行模拟。研究结果表明：不考虑植物根系影响，只考虑孔隙率变化，Ergun方程的计算结果明显低于实测结果。改进后的欧根方程 （M-E-pl） 的计算结果可以较为准确预测水槽中石质介质的水头损失。其中豆粒砾石介质的预测结果较为理想， |
| 英文摘要: |
| Based on annulus flow，modification was made to the turbulent flow term in the Ergun equation to account for flow resistance of plant roots in submerged flow rock beds. For four-year plant growth measured hydraulic data using two rock media in the flumes 7.62m×0.46m×0.31m and 7.62m×0.46m×0.295m were compared with the predicted results using the Ergun and M-E equations. Differences of root distribution in vertical direction resulted in two distinct root profiles，with the upper por-tion of the bed having a greater porosity reduction. The Ergun equation greatly underestimated the head loss of the rock media beds.It is concluded that the head losses modeled by the equation（M-E-pl） are close to the measured data of the peal gravel rock bed，if plant root effect is considered，but it is slightly underestimated head loss for the lower portion of the bed for the creek rock bed. |
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