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首页> 外文会议>AWRA(American Water Resources Association) 2002 Summer Specialty Conference on Ground Water/Surface Water Interactions, Jul 1-3, 2002, Keystone, Colorado >CONNECTIVITY OF HYDROLOGIC AND NUTRIENT INPUTS TO SUMMER FLOODS
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CONNECTIVITY OF HYDROLOGIC AND NUTRIENT INPUTS TO SUMMER FLOODS

机译：水分和养分输入与夏季水的连通性

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摘要

Nutrient loading in semi-arid streams during flood events may result primarily from soil flushing and transient bank storage. To test this hypothesis, eight soil lysimeters and two stream autosamplers were placed along a 500 m reach of the San Pedro River, Arizona, in summer 2001, alongside 45 piezometers we installed last spring. Flood samples were collected once to twice hourly, and soil water samples were collected within a few days after a flood. Samples were analyzed for conservative chemical tracers and dissolved nutrients. Nitrate concentrations were elevated (-5-6 mg/L) in some soil water samples from adjacent banks that became saturated during flood events; nitrate concentrations in baseflow and groundwater were often below detection (< 0.01 mg/L). A simple mixing model indicated that soil water was flushed from the banks prior to and during peak flow, an occurrence that may be associated with elevated stream nitrate concentrations. Dissolved organic carbon (DOC) concentrations exhibited a delayed response, but increased by ～3 mg/L shortly after peak flow. These results corroborate that soil flushing may be a significant contributor of nutrients during floods, but the role of post-flood bank drainage may not be as important to the overall nutrient balance.
机译：洪水事件期间半干旱河流中的养分负荷可能主要来自土壤冲刷和河岸暂时存储。为了检验这一假设，2001年夏季，在亚利桑那州的圣佩德罗河500公里处，放置了8个土壤测渗仪和2个流量自动进样器，并于去年春天安装了45个测压计。每小时收集一次到两次的洪水样本，洪水后几天内收集土壤水样本。分析样品中的保守化学示踪剂和溶解的营养素。邻近河岸的一些土壤水样品中的硝酸盐浓度升高（-5-6 mg / L），这些样品在洪水事件中变得饱和。基流和地下水中的硝酸盐浓度通常低于检测值（<0.01 mg / L）。一个简单的混合模型表明，在洪峰流量发生之前和期间，从河岸冲刷了土壤水，这可能与硝酸盐浓度升高有关。溶解有机碳（DOC）浓度显示出延迟响应，但在峰值流量后不久增加了〜3 mg / L。这些结果证实，在洪水期间土壤冲刷可能是养分的重要来源，但洪水后河床排水对总养分平衡的作用可能不那么重要。

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