LANLoad NEEPP - Polk County: Landscape Assessment of Nutrient Loading to Waterbodies (LANLoad) in the Northern Everglades and Estuaries Protection Program (NEEPP) Region V2

This raster dataset consists of cells (10m x 10m) ranked to reflect the likelihood that nutrients applied to a given terrestrial location will reach the nearest downgradient surface waterbody. Possible ranks range from 1 to 9 with values increasing as the likelihood of nutrient transport to downgradient surface waterbodies increases. Ranks are based on six physical landscape parameters selected by Subject Matter Experts (SMEs) who also assigned relative weights to each parameter using the Analytical Hierarchy Process (AHP). During this exercise, the location considered by SMEs was the pilot study area, St. Lucie County, FL, and the focal nutrient source was Onsite Sewage and Treatment Disposal Systems (OSTDS). Despite the original focus on OSTDS, LANLoad NEEPP can be used to gauge the likelihood of nutrient transport to surface waterbodies from other, similar, nutrient sources. The resulting AHP model demonstrated high internal consistency (Consistency Ratio: 0.01) and resulted in the following parameters and weights, in order of importance: Distance to Waterbody, 30.0%; Depth to Water, 21.6%; Hydraulic Conductivity, 20.7%; Potential for Flooding, 10.9%; Slope, 9.8%; and Surficial Karstic Deposits, 7.0%. The weights assigned by SMEs in the St. Lucie County pilot were deemed applicable to the NEEPP region due to highly similar geologic/hydrologic conditions. Relative parameter weights may not be applicable to regions without such similarities. Geospatial datasets representative of these parameters were acquired in 2024 and combined using a weighted overlay to produce LANLoad NEEPP. The performance of LANLoad NEEPP was evaluated at multiple locations (selected through a random stratified process) within the NEEPP region by classifying LANLoad NEEPP ranks less than or equal to 4 as “lower” likelihood and those more than or equal to 6 as “higher” likelihood. Then, two independent assessment methods were applied, both conducted blind: SME Review: SMEs were provided with input datasets corresponding to 30 locations and asked to assign a classification of lower or higher likelihood to each location using best professional judgement. There was 92 % consistency between classifications assigned by LANLoad NEEPP and those assigned by SMEs. Numerical modeling: Using ArcNLET-Py, nutrient loading to surface waters from uniform inputs was modeled in 10 locations, each containing 50 model points. Classifications assigned by LANLoad NEEPP were 100% consistent with those assigned through ArcNLET-Py model results, i.e., locations classified by LANload NEEPP as “higher” likelihood also had the highest ArcNLET-Py modeled nutrient loads while those classified as “lower” likelihood had the lowest modeled nutrient loads. LANLoad NEEPP was developed in ArcGIS Pro 3.4.2 (ESRI) at a 10-meter resolution, using the NAD83 (2011) Datum and the Florida GDL Albers Ellipsoid: GRS 1980 projection. Table 1: The geospatial datasets incorporated in LANLoad NEEPP (2025). Abbreviations: Florida Department of Environmental Protection (DEP), National Resources Conservation Service (NRCS), South Florida Water Management District (SFWMD), Federal Emergency Management Agency (FEMA), Florida Geological Survey (FGS), University of South Florida (USF) and U.S. Geological Survey (USGS). Parameter Geospatial Dataset Source Date Acquired Waterbodies Florida NHD Waterbody Polygons DEP 11/8/2024 Florida NHD Area Polygons DEP Florida NHD Flowlines DEP Soil Survey Geographic Dataset (SSURGO) NRCS 9/20/2024 Distance to Waterbodies DEM + Waterbodies SFWMD, USGS 9/24/2024 Depth to Groundwater Soil Survey Geographic Dataset (SSURGO) NRCS 9/20/2024 Hydraulic Conductivity Soil Survey Geographic Dataset (SSURGO) NRCS 9/20/2024 Potential for Flooding National Flood Hazard Layer (NFHL) FEMA 9/9/2024 Topography (slope) DEM + Distance to Waterbodies SFWMD, USGS, USF-ERG 9/24/2024 Surficial Karstic Deposits Surficial Geology of Florida FGS 9/16/2024 Contact Information Kai C. Rains, PhD, PWS – [e-mail] Dataset Citation Rains, Kai; Guerron-Orejuela, Edgar; Davis, Sara; Okonkwo, Moses; Rains, Mark (2026), “LANLoad NEEPP: Landscape Assessment of Nutrient Loading to Waterbodies (LANLoad) in the Northern Everglades and Estuaries Protection Program (NEEPP) region”, University of South Florida, V2, doi: 10.17632/7nw285j9bk.2 Links: USF Ecohydrology Research Group LANLoad Phase III Final Report Florida Geographic Information Office Logos:本栅格数据集（raster dataset）由10米×10米的像元组成，各像元被赋予分值以反映施用于某陆地区域的养分运移至最近下坡向地表水体的可能性。分值区间为1至9，分值越高，养分运移至下坡向地表水体的可能性就越大。 分值基于领域专家（Subject Matter Experts, SMEs）遴选的6项地表景观参数确定，专家还通过层次分析法（Analytical Hierarchy Process, AHP）为各参数赋予了相对权重。本次研究的试点区域为佛罗里达州圣露西县（St. Lucie County, FL），目标养分来源为现场污水处置系统（Onsite Sewage and Treatment Disposal Systems, OSTDS）。 尽管最初仅针对现场污水处置系统，但LANLoad NEEPP仍可用于评估其他类似养分来源的养分向地表水体运移的可能性。本次构建的层次分析法模型内部一致性极高（一致性比率：0.01），按重要性排序的参数及对应权重如下：距水体距离（30.0%）、地下水埋深（21.6%）、导水率（20.7%）、洪水潜势（10.9%）、坡度（9.8%）以及表层喀斯特沉积（7.0%）。 由于北佛罗里达大沼泽与河口保护项目（Northern Everglades and Estuaries Protection Program, NEEPP）区域与圣露西县试点区的地质与水文条件高度相似，专家为试点区赋予的参数权重被认为适用于该区域，但若区域条件不具备此类相似性，则参数相对权重可能不适用。 研究团队于2024年获取了代表上述各参数的地理空间数据集，并通过加权叠加工具将其整合，最终生成LANLoad NEEPP数据集。 LANLoad NEEPP的性能通过在NEEPP区域内随机分层选取的多个点位开展评估：将LANLoad NEEPP分值≤4的点位划分为“低”可能性组，分值≥6的点位划分为“高”可能性组。随后采用两种独立的盲法评估方法： 1. 专家评审：向专家提供30个点位的输入数据集，要求专家凭借专业判断为每个点位赋予低/高可能性分类。LANLoad NEEPP的分类结果与专家评审结果的一致性达92%。 2. 数值模拟：通过ArcNLET-Py对10个点位（每个点位包含50个模型节点）的均匀输入养分向地表水体的运移负荷进行模拟。LANLoad NEEPP的分类结果与ArcNLET-Py模拟结果完全一致：即被LANLoad NEEPP划分为“高”可能性的点位，其ArcNLET-Py模拟的养分负荷也最高；而被划分为“低”可能性的点位，模拟养分负荷则最低。 LANLoad NEEPP基于ArcGIS Pro 3.4.2（ESRI）开发，分辨率为10米，采用NAD83（2011）基准面与佛罗里达GDL阿尔伯斯椭球体：GRS 1980投影。 表1：2025年LANLoad NEEPP所纳入的地理空间数据集。缩写说明：佛罗里达州环境保护部（Florida Department of Environmental Protection, DEP）、美国自然资源保护服务局（National Resources Conservation Service, NRCS）、南佛罗里达水资源管理区（South Florida Water Management District, SFWMD）、联邦紧急事务管理局（Federal Emergency Management Agency, FEMA）、佛罗里达地质调查局（Florida Geological Survey, FGS）、南佛罗里达大学（University of South Florida, USF）以及美国地质调查局（U.S. Geological Survey, USGS）。 | 参数 | 地理空间数据集 | 来源 | 获取日期 | | --- | --- | --- | --- | | 水体 | 佛罗里达NHD水体多边形 | DEP | 2024/11/8 | | | 佛罗里达NHD区域多边形 | DEP | - | | | 佛罗里达NHD水系线 | DEP | - | | | 土壤调查地理数据集（SSURGO） | NRCS | 2024/9/20 | | 距水体距离 | 数字高程模型（DEM）+ 水体数据集 | SFWMD、USGS | 2024/9/24 | | 地下水埋深 | 土壤调查地理数据集（SSURGO） | NRCS | 2024/9/20 | | 导水率 | 土壤调查地理数据集（SSURGO） | NRCS | 2024/9/20 | | 洪水潜势 | 国家洪水灾害图层（NFHL） | FEMA | 2024/9/9 | | 地形（坡度） | 数字高程模型（DEM）+ 距水体距离数据集 | SFWMD、USGS、USF-ERG | 2024/9/24 | | 表层喀斯特沉积 | 佛罗里达表层地质图 | FGS | 2024/9/16 | 联系方式：Kai C. Rains博士，PWS – [e-mail] 数据集引用：Rains, Kai; Guerron-Orejuela, Edgar; Davis, Sara; Okonkwo, Moses; Rains, Mark (2026), "LANLoad NEEPP: Landscape Assessment of Nutrient Loading to Waterbodies (LANLoad) in the Northern Everglades and Estuaries Protection Program (NEEPP) region", 南佛罗里达大学, V2, doi: 10.17632/7nw285j9bk.2 相关链接：南佛罗里达大学生态水文研究组LANLoad第三阶段最终报告；佛罗里达地理信息办公室标识。