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Patterns of total suspended solids concentration and the influence of antecedent conditions on hydrograph response to precipitation events on Beaver Creek, Ontario.

机译:安大略省比弗克里克的总悬浮固体浓度模式和前期条件对水文图对降水事件的响应的影响。

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This study explored relationships between suspended solids concentration and discharge, the influence of antecedent conditions on event hydrographs and the state of dynamic equilibrium in a second-order stream (Beaver Creek), draining an agricultural basin in southern Ontario, near the City of Waterloo. Beaver creek was monitored for nineteen weeks from July to November of 2005. Thirteen precipitation events of various magnitude and duration were examined within the study period. Discharge and total suspended solids were sampled throughout the events. Cross sectional profiles of six transects were measured prior to and after each event.;Base flow, antecedent conditions and event response were quantified. A strong (R2 = 0.79) positive relationship was found between antecedent conditions and basin response to precipitation events, whereby, wetter conditions in the basin prior to a storm resulted in greater changes in discharge compared to changes in discharge seen with dryer antecedent conditions. Suspended solids/discharge patterns during storm flow were best described using a hysteretic clockwise loop indicating a change in supply source throughout a given event. Rapid changes in suspended solids concentrations were related to decreased detachment by rainfall splash rather than source exhaustion or dilution. Average suspended solids flux showed only a 34% difference between input and output from the study area. Also, cross sectional bed profiles showed that over the duration of this study the creek was in a state of low morphological activity.;For design of monitoring programs as well as planning development within a basin, knowledge of storm sediment patterns, the influence of antecedent conditions on basin response to a precipitation event and resulting sediment flux in agricultural creeks is significant. These patterns should be taken as benchmarks for continued assessment of the impacts of human activities around water ways.
机译:这项研究探索了悬浮固体浓度和流量,事前条件对事件水位图的影响以及二级流(海狸溪)中动态平衡状态之间的关系,该二级流向位于滑铁卢市附近的安大略省南部的一个农业盆地排水。从2005年7月至11月,对海狸小河进行了19周的监测。在研究期内检查了13次不同大小和持续时间的降水事件。在整个事件中对排放物和总悬浮固体进行采样。在每个事件之前和之后测量六个断面的横截面轮廓。定量基础流量,先决条件和事件响应。在先行条件和盆地对降水事件的响应之间发现了很强的正相关(R2 = 0.79),因此,与干燥器先行条件下的排放变化相比,暴风雨之前盆地中较湿的条件导致排放变化更大。最好使用迟滞顺时针循环来描述风暴潮期间的悬浮固体/排放模式,该循环指示整个给定事件中供应源的变化。悬浮固体浓度的快速变化与降雨溅起而不是源极耗尽或稀释引起的脱附减少有关。平均悬浮固体通量显示研究区域的投入和产出之间只有34%的差异。此外,横断面剖面图表明,在本研究期间,小河处于低形态活动状态。;对于监测程序的设计以及流域内的规划开发,了解风暴沉积物模式,前期的影响在农业小河中,盆地对降水事件的响应条件和产生的泥沙通量非常重要。这些模式应作为继续评估人类活动对水路影响的基准。

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