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塘堰湿地因其良好的生态性能而被广泛用于水稻灌区的排水净化,由于湿地的水力性能及净化效果受到诸多因素影响,客观认识这些因素的作用机理有助于提高湿地设计和运行管理的质量.本文通过示踪剂试验探讨了不同水深(20、40、60 cm)对塘堰湿地水力特性的影响.结果表明:随着湿地水深的减小,湿地的有效容积率从0.421增加到0.844,水力效率从0.281增加到0.604;在水深较小时(20和40 cm),湿地前半部分的有效容积率达到0.9以上,明显优于湿地整体情况,湿地前半部分的水流混合情况高,接近于完全混合流.通过对原始示踪曲线的标准化分析发现,矩分析参数与水力参数有较好的数值一致性,水力参数与不受尾部截断误差影响的矩指数之间具有良好的一致性.塘堰湿地水深较小时有利于提高湿地的水力性能,试验结果可为今后塘堰湿地的优化设计提供参考.
Because of its good ecological performance, pond weir has been widely used in the drainage irrigation of rice irrigation area. Because the hydraulic properties and purification effect of wetlands are affected by many factors, objective understanding of the mechanism of these factors helps to improve the quality of wetland design and operation management In this paper, the effect of different water depths (20, 40, 60 cm) on the hydraulic characteristics of pond weir was discussed by means of tracer test.The results showed that with the decrease of water depth, the effective volume of wetlands increased from 0.421 to 0.844, Efficiency increased from 0.281 to 0.604. At low water depths (20 and 40 cm), the effective volume fraction of the first half of the wetland reached more than 0.9, which was significantly better than that of the whole wetland. The first half of the wetland had high mixing of water flow and close to the complete mixed flow Through the standard analysis of the original trace curve, it is found that there is a good consistency between the moment analysis parameters and the hydraulic parameters, and the hydraulic parameters have a good consistency with the moment index which is not affected by the tail truncation error. Hour is beneficial to improve the hydraulic performance of the wetland, the test results can provide reference for the optimization design of the pond weir wetlands in the future.