Geofabric Hydrology Reporting Catchments - V2.1

## **Abstract** \n\nThis dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.\n\n\n\nGeofabric Hydrology Reporting Catchments comprises two related views of hydrological catchments to be used for analysis and reporting purposes. Firstly, a topological network view of hydrological catchments represented as a simplified node-link network using a subset of the contracted nodes (AHGFNode) and the links (AHGFLink) between them; and secondly, a catchments view of the hydrology using the contracted catchments (AHGFContractedCatchment). The AHGFNode feature class contains contracted nodes that are points of hydrological significance that carry identity. They include the confluence of major named streams, coastal stream termini, waterbody inflow and outflows and inland sinks. It also contains a new class of node called diffuse nodes that represent diffused flow from groups of nodes at coastal, delta or inter-catchment outlets. The AHGFLink feature class provides the topological connectors between a subset of contracted nodes that participate in the simplified node-link network. The AHGFContractedCatchment feature class contains catchment polygons (that are aggregations of AHGFCatchments) for the subset of contracted nodes that participate in the simplified node link network. These catchments are part of a hierarchy that can be aggregated based on upstream relationships. This product contains five feature types including: Node, Link, Contracted Catchment, Node-Link Connectivity (upstream), and Node-Link Connectivity (downstream).\n\n## **Purpose** \n\nGeofabric Hydrology Reporting Catchments is designed to meet two specific use cases. Firstly, the contracted catchments are designed to build stable reporting regions and secondly, the simplified node-link network is designed to be used as input to hydrological modelling environments, to identify nodes, reporting reaches and their associated catchments.\n\n\n\nThe AHGFContractedCatchment feature class is designed to represent geographic surface boundaries that have a hydrological relationship to surface water features. These catchment boundaries in their current form may not completely satisfy legislative or business requirements, but are intended to provide the building blocks for reporting regions such as those given in Geofabric Hydrology Reporting Regions. The AHGFNode and AHGFLink feature classes provide a simplified, dendritic node link network for input into hydrological models.\n\n## **Dataset History** \n\nGeofabric Hydrology Reporting Catchments is part of a suite of Geofabric products produced by the Australian Bureau of Meteorology. The geometry of this product is derived from the Geofabric Surface Network product. It consists of AHGF Node, AHGF Link and AHGF Contracted Catchments as well as AHGF Node-Link Connectivity tables for both upstream and downstream network tracing. The outflow point for each AHGF Contracted Catchment is based on a Contracted Node and the boundaries of the underlying AHGF Catchments. The feature class terminology for Geofabric Hydrology Reporting Catchments components has been modified to distinguish it in terms of the products underlying data model.\n\n\n\nThe AHGFContractedCatchments are aggregations of the 9 second catchments that participate in a relationship of common areal extent, based upon the location of a Contracted Node from both the Geofabric Surface Cartography and Geofabric Surface Network products. The types of contracted nodes and the levels of contracted confidence are further described in the Geofabric Product Guide.\n\n\n\nProcessing steps: \n\n1. re-composited feature classes in the Geofabric Maintenance Geodatabase Feature Dataset are assigned unique Hydro-IDs using ESRI ArcHydro for Surface Water (ArcHydro: 1.4.0.180 and ApFramework: 3.1.0.84)\n\n2.\tfeature classes from the Geofabric Maintenance Geodatabase Feature Dataset are extracted and reassigned to the Geofabric Hydrology Reporting Catchments Feature Dataset within the Geofabric Hydrology Reporting Catchments Geodatabase.\n\n\n\nA complete set of data mappings, from input source data to Geofabric Products, is included in the Geofabric Product Guide, Appendices.\n\n## **Dataset Citation** \n\nBureau of Meteorology (2011) Geofabric Hydrology Reporting Catchments - V2.1. Bioregional Assessment Source Dataset. Viewed 13 March 2019, http://data.bioregionalassessments.gov.au/dataset/ce066e36-49ad-4f77-b505-b1d2a4fe9c6a.

## **摘要**

本数据集及其元数据声明由第三方提供给生物区域评估计划（Bioregional Assessment Programme），并按原始提供形式呈现于此。

Geofabric水文报告流域包含两种用于分析与报告的水文流域相关视图：其一为水文流域的拓扑网络视图，该视图通过收缩节点（AHGFNode）子集及其间的连接（AHGFLink），以简化的节点-链路网络形式呈现；其二为采用收缩流域（AHGFContractedCatchment）的水文流域视图。AHGFNode要素类包含具有水文重要性且带有标识的收缩节点，包括主要命名河流的汇流处、沿海河流终点、水体入流与出流点以及内陆汇点。此外，该类还包含一类新节点——扩散节点，代表沿海、三角洲或流域间出口处节点群的扩散流。AHGFLink要素类为参与简化节点-链路网络的收缩节点子集提供拓扑连接。AHGFContractedCatchment要素类包含参与简化节点链路网络的收缩节点子集对应的流域多边形（为AHGFCatchments的聚合）。这些流域属于可基于上游关系进行聚合的层级结构的一部分。本产品包含五种要素类型：节点、连接、收缩流域、节点-链路连通性（上游）及节点-链路连通性（下游）。

## **目的**

Geofabric水文报告流域旨在满足两类特定应用场景：其一，收缩流域用于构建稳定的报告区域；其二，简化节点-链路网络用作水文建模环境的输入，以识别节点、报告河段及其关联流域。

AHGFContractedCatchment要素类用于表示与地表水体要素存在水文关系的地理表面边界。当前形式的这些流域边界可能无法完全满足立法或业务需求，但旨在为报告区域（如Geofabric水文报告区域中所述）提供基础构建块。AHGFNode与AHGFLink要素类为水文模型输入提供简化的树状节点链路网络。

## **数据集历史**

Geofabric水文报告流域是澳大利亚气象局（Australian Bureau of Meteorology）生产的Geofabric产品套件的一部分。本产品的几何数据源自Geofabric地表网络产品，包含AHGF节点、AHGF连接、AHGF收缩流域，以及用于上下游网络追踪的AHGF节点-链路连通性表。每个AHGF收缩流域的流出点基于收缩节点和底层AHGF流域的边界确定。Geofabric水文报告流域组件的要素类术语已进行修改，以基于产品底层数据模型对其加以区分。

AHGF收缩流域是9秒流域的聚合，这些9秒流域基于Geofabric地表制图与Geofabric地表网络产品中收缩节点的位置，具有共同的区域范围关系。收缩节点的类型及收缩置信度等级在《Geofabric产品指南》中有进一步描述。

处理步骤：

1. 使用ESRI ArcHydro地表水工具（ArcHydro版本：1.4.0.180，ApFramework版本：3.1.0.84），为Geofabric维护地理数据库要素数据集中的重组要素类分配唯一水文ID（Hydro-ID）；

2. 从Geofabric维护地理数据库要素数据集中提取要素类，并将其重新分配至Geofabric水文报告流域地理数据库内的Geofabric水文报告流域要素数据集。

输入源数据到Geofabric产品的完整数据映射集包含于《Geofabric产品指南》附录中。

## **数据集引用**

澳大利亚气象局（2011）Geofabric水文报告流域 - V2.1。生物区域评估源数据集。查阅日期：2019年3月13日，http://data.bioregionalassessments.gov.au/dataset/ce066e36-49ad-4f77-b505-b1d2a4fe9c6a。