Datasets and metadata for estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology

This USGS data release contains datasets, metadata, and figures associated with estimating nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology. There are three shapefiles with associated metadata and figures representing the shapefiles: Catchments_GWcontribN.shp: NHDPlus catchment estimates of groundwater contribution of nitrate to streams in the Chesapeake Bay watershed HUC12_GWcontribN.shp: HUC 12 estimates of groundwater contribution of nitrate to streams in the Chesapeake Bay watershed Sites_GWcontribN.shp: Sites with baseflow measurements for nitrate plus nitrite within the Chesapeake Bay watershed These data support the following publication: Terziotti, Silvia, Capel, P.D., Tesoriero, A.J., Hopple, J.A., and Kronholm, S.C., 2017, Estimates of nitrate loads and yields from groundwater to streams in the Chesapeake Bay watershed based on land use and geology: U.S. Geological Survey Scientific Investigations Report 2017-5160, 20 p., https://doi.org/10.3133/sir20175160.

本美国地质调查局（United States Geological Survey, USGS）此次发布的数据，涵盖与基于土地利用与地质条件估算切萨皮克湾流域地下水向溪流输送的硝酸盐负荷与产率相关的数据集、元数据及配套配图。本次发布包含三个带相关元数据与对应配图的形状文件（shapefile）：
1. Catchments_GWcontribN.shp：基于NHDPlus的切萨皮克湾流域集水区地下水向溪流输送硝酸盐贡献量估算数据
2. HUC12_GWcontribN.shp：切萨皮克湾流域12级水文单元（HUC 12）地下水向溪流输送硝酸盐贡献量估算数据
3. Sites_GWcontribN.shp：切萨皮克湾流域内带有硝酸盐与亚硝酸盐基流实测数据的监测点位
本数据集支撑以下已发表学术文献：Terziotti, Silvia、Capel, P.D.、Tesoriero, A.J.、Hopple, J.A. 及 Kronholm, S.C.，2017年，《基于土地利用与地质条件的切萨皮克湾流域地下水向溪流输送硝酸盐负荷与产率估算》，载于美国地质调查局科学调查报告2017-5160，全文共20页，DOI链接：https://doi.org/10.3133/sir20175160。