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首页> 外文期刊>Journal of the American Water Resources Association >ASSESSING IMPERVIOUS SURFACE CONNECTIVITY AND APPLICATIONS FOR WATERSHED MANAGEMENT
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ASSESSING IMPERVIOUS SURFACE CONNECTIVITY AND APPLICATIONS FOR WATERSHED MANAGEMENT

机译：评估不正确的表面连通性及其在流域管理中的应用

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Although total impervious area (TIA) is often used as an indicator of urban disturbance, recent studies suggest that the subset of impervious surfaces that route stormwater runoff directly to streams via stormwater pipes, called directly connected impervious area (DCIA), may be a better predictor of stream ecosystem alteration. We evaluated the differences between TIA and DCIA in the Shepherd Creek catchment, a small (1.85-km~2), suburban basin in Cincinnati, Ohio. Imperviousness determinations were calculated based on publicly available geographic information system (GIS) data and parcel-scale field assessments, and these direct assessments were compared to DCIA calculated from published, empirical relationships. Impervious and semi-impervious area comprised 13.1% of the catchment area, with 56.3% of the impervious area connected. When summarized by subcatchments (0.26-1.85 km~2), TIA measured in the field (11-23%) was considerably higher than that calculated from the National Land Cover Data Imperviousness Layer (7-18%). In contrast, TIA calculated based on aerial photos was similar to TIA calculated from field assessments, thus indicating that photo interpretation may be adequate for catchment-scale (>25 ha) TIA determinations. While these GIS data sources can be used to calculate TIA, on-site assessments were necessary to accurately determine DCIA within residential parcels. There was a wide variation in percent connectivity across parcels, and, subsequently, DCIA was not accurately predicted from empirical relationships with TIA. We discuss applications of DCIA data that highlight the importance of parcel-scale field assessments for managing suburban watersheds.
机译：尽管总不透水面积（TIA）通常被用作指示城市扰动的指标，但最近的研究表明，通过雨水管道将雨水径流直接引导至溪流的不透水表面的子集，称为直接连接不透水区域（DCIA），可能更好。流生态系统变化的预测因子。我们评估了位于俄亥俄州辛辛那提市郊区盆地Shepherd Creek流域的TIA和DCIA之间的差异。基于公众可获得的地理信息系统（GIS）数据和地块规模的田间评估计算不透性确定，并将这些直接评估与根据已发布的经验关系式计算得出的DCIA进行比较。防渗和半防渗区占集水区的13.1％，连接的防渗区占56.3％。用子汇水面积（0.26-1.85 km〜2）进行汇总时，实地测得的TIA（11-23％）大大高于根据国家土地覆被数据不透水层（7-18％）计算的TIA。相比之下，基于航空照片计算的TIA与根据现场评估计算的TIA相似，因此表明照片解释对于流域规模（> 25公顷）TIA确定可能是足够的。虽然这些GIS数据源可用于计算TIA，但必须进行现场评估才能准确确定住宅用地中的DCIA。跨包裹的连接百分比差异很大，因此，从与TIA的经验关系中无法准确预测DCIA。我们讨论了DCIA数据的应用，这些数据强调了地块规模的现场评估对于管理郊区流域的重要性。

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