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首页> 外文期刊>Journal of the American Water Resources Association >DRY AND WET WEATHER FLOW NUTRIENT LOADS FROM A LOS ANGELES WATERSHED
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DRY AND WET WEATHER FLOW NUTRIENT LOADS FROM A LOS ANGELES WATERSHED

机译：洛杉矶流域的干湿天气流动的养分

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摘要

Effective watershed management requires an accurate assessment of the pollutant loads from the associated point and nonpoint sources. The importance of wet weather flow (WWF) pollutant loads is well known, but in semi-arid regions where urbanization is significant the pollutant load in dry weather flow (DWF) may also be important. This research compares the relative contributions of potential contaminants discharged in DWF and WWF from the Ballona Creek Watershed in Los Angeles, California. Models to predict DWF and WWF loads of total suspended solids, biochemical oxygen demand, nitrate-nitrogen, nitrite-nitrogen, ammonia-nitrogen, total Kjeldahl nitrogen, and total phosphorus from the Ballona Creek Watershed for six water years dating from 1991 to 1996 were developed. The contaminants studied were selected based on data availability and their potential importance in the degradation of Ballona Creek and Santa Monica Bay beneficial uses. Wet weather flow was found to contribute approximately 75 percent to 90 percent of the total annual flow volume discharged by the Ballona Creek Watershed. Pollutant loads are also predominantly due to WWF, but during the dry season, DWF is a more significant contributor. Wet weather flow accounts for 67 to 98 percent of the annual load of the constituents studied. During the dry season, however, the portion attributable to DWF increases to greater than 40 percent for all constituents except biochemical oxygen demand and total suspended solids. When individual catchments within the watershed are considered, the DWF pollutant load from the largest catchment is similar to the WWF pollutant load in two other major catchments. This research indicates WWF is the most significant source of nonpoint source pollution load on an annual basis, but management of the effects of the nonpoint source pollutant load should consider the seasonal importance of DWF.
机译：有效的流域管理要求对相关点和非点源的污染物负荷进行准确评估。众所周知，潮湿天气流（WWF）污染物负荷的重要性，但在城市化程度很高的半干旱地区，干旱天气流（DWF）污染物负荷也可能很重要。这项研究比较了加州洛杉矶的巴罗纳溪流域的DWF和WWF排放的潜在污染物的相对贡献。预测从1991年至1996年的六个水年中来自Ballona Creek流域的总悬浮固体，生物化学需氧量，硝酸盐氮，亚硝酸盐氮，氨氮，总凯氏氮和总磷的DWF和WWF负荷的模型是发达。根据数据可用性及其在Ballona Creek和Santa Monica Bay有益用途的降解中的潜在重要性来选择所研究的污染物。发现潮湿的天气流量占Ballona Creek流域排放的年流量总量的大约75％至90％。污染物负荷也主要归因于世界自然基金会，但在干旱季节，DWF的贡献更大。潮湿的天气流量占所研究成分年负荷的67％至98％。但是，在干旱季节，除生化需氧量和总悬浮固体外，所有成分的DWF所占比例均增加到40％以上。当考虑流域内的单个流域时，最大流域的DWF污染物负荷与其他两个主要流域的WWF污染物负荷相似。这项研究表明，WWF每年是非点源污染负荷的最重要来源，但是对非点源污染物负荷的影响进行管理时应考虑DWF的季节重要性。

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