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首页> 外文期刊>Journal of the American Water Resources Association >Evaluating Geomorphic Change in Constructed Two-Stage Ditches
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Evaluating Geomorphic Change in Constructed Two-Stage Ditches

机译：人工二段沟地貌变化评价

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Straight, trapezoidal-shaped surface drainage channels efficiently drain the soil profile, but their deviations from natural fluvial conditions drive the need for frequent maintenance. Ecological and socioeconomic impacts of drainage ditch maintenance activities can be significant, leading to harmful algal blooms and increased sedimentation. We developed a two-stage ditch design that is more consistent with fluvial form and process. The approach has potential to enhance ecological services while meeting drainage needs essential for agricultural production. We studied geomorphic change of the inset channel, benches and banks of seven two-stage ditches in Ohio, Indiana, and Michigan. Three to 10years after construction, inset channel changes reflected natural adjustments, but not all ditches had reached their quasi-equilibrium state. Ditches had experienced both degradation and aggradation on the benches at a rate of 0.5-13mm/yr. Aggradation on the benches was not likely to threaten tile drain outlets. Localized scour was observed on the banks at some sites, but at all but one site changes were not statistically significant. Except for the removal of woody vegetation, none of the ditches required routine maintenance since construction. Two-stage ditches can be a stable, viable option for drainage ditch management if designed and installed properly on the landscape.
机译：笔直的梯形表面排水通道可有效地排水土壤剖面，但是它们与自然河流条件的偏差促使人们需要频繁维护。排水沟维护活动的生态和社会经济影响可能是重大的，导致有害的藻华和增加的沉积。我们开发了一个两阶段的沟渠设计，它与河床的形式和工艺更加一致。该方法有潜力在满足农业生产必不可少的排水需求的同时，增强生态服务。我们研究了俄亥俄州，印第安纳州和密歇根州的七个两级沟渠的入水通道，长凳和河岸的地貌变化。施工后三到十年，排水沟的变化反映出自然的调整，但并不是所有的沟渠都达到了准平衡状态。在长椅上，沟渠经历了退化和凝结，速率为0.5-13mm /年。长凳上的积聚不太可能威胁瓷砖排水口。在某些地点的银行观察到局部冲刷，但除一个地点外，其他地点的变化均无统计学意义。自建造以来，除去除木本植物外，所有沟渠均无需日常维护。如果在景观上进行了适当设计和安装，则两级沟渠可以成为排水沟管理的稳定，可行的选择。

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