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首页> 外文期刊>Canadian Water Resources Journal >Integrating hydrogeomorphological concepts in management approaches of lowland agricultural streams: Perspectives, problems and prospects based on case studies in Quebec
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Integrating hydrogeomorphological concepts in management approaches of lowland agricultural streams: Perspectives, problems and prospects based on case studies in Quebec

机译：将水文地貌概念整合到低地农业流的管理方法中：基于魁北克案例研究的观点，问题和前景

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Alternative management approaches for agricultural streams based on hydrogeomorphological principles such as a two-stage channel are promising, but need to be further tested in contexts other than the Midwestern United States. In Quebec (Canada), the presence of many deep drain outlets may limit their applicability. The objectives of this research are to (1) assess the feasibility of implementing the two-stage channel design in Quebec; (2) determine how alternative management approaches compare with traditional management from an economical point of view, and (3) evaluate the impact of modifying the drain outlet design using small horseshoe wetlands to accommodate hydrogeomorphological adjustments of the channel. A combination of case studies and numerical modelling (HEC-RAS, Hydrologic Engineering Center's River Analysis System) was used for three study sites located in the Monteregie region (QC). Based on regional hydraulic geometry curves, additional space on each bank required for a two-stage channel ranged between 1.3 and 2.8 m for a width equal to 3 times the inset channel. Hydraulic modelling confirms previous findings of improved drainage capacity at high flow, (up to a 54% increase). Cost analysis reveals that two-stage and over-widened channels are 3 to 4 times more expensive to implement when compared to traditional trapezoidal clean-out dredging operations, mainly due to spoil removal and transportation. However, self-formed channels are less expensive since they only require additional riparian land. A crop yield analysis in the near-stream zone at three sites which are frequently flooded revealed markedly lower productivity in zones within the flooding space. The horseshoe wetland design for drain outlets could also be maintained at low cost, and would promote more heterogeneity than the traditional trapezoidal ditches. Using alternative agricultural stream management approaches based on hydrogeomorphological concepts would be feasible in the Quebec context without compromising the overall productivity of this key economic sector.
机译：基于水文地貌学原理（例如两级河道）的农业流替代管理方法很有希望，但需要在美国中西部以外的地区进行进一步测试。在魁北克（加拿大），许多深排水口的存在可能会限制其适用性。这项研究的目的是（1）评估在魁北克实施两阶段航道设计的可行性； （2）从经济的角度确定替代管理方法与传统管理的比较，以及（3）评估使用小马蹄形湿地修改排水口设计以适应河道水文地貌调整的影响。案例研究和数值模型（HEC-RAS，水文工程中心的河流分析系统）相结合，被用于位于蒙特雷吉地区（QC）的三个研究地点。根据区域水力几何曲线，两段通道所需的每个堤坝上的额外空间范围为1.3到2.8 m，宽度等于插入通道的3倍。水力模型证实了以前在高流量下排水能力得到改善（增加高达54％）的发现。成本分析表明，与传统的梯形清理疏dr作业相比，两级和超宽渠道的实施成本高出3至4倍，这主要是由于弃渣和运输所致。但是，自建渠道成本较低，因为它们仅需要额外的河岸土地。在三个经常被水淹的地点的近流区的作物单产分析表明，水淹区域内各区的生产力明显降低。用于排水口的马蹄形湿地设计也可以保持低成本，并且比传统的梯形沟渠具有更多的异质性。在魁北克背景下，采用基于水文地貌学概念的替代性农业流管理方法将是可行的，而不会损害该关键经济部门的整体生产率。

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