HEVAE Vegetation Groundwater Dependent Ecosystems Value - Sydney Metropolitan

NSW DoI Water has adopted the Guidelines for Identifying High Ecological Value Aquatic Ecosystems (HEVAE) framework developed by the Australian Commonwealth Government. In the current assessment for NSW, the HEVAE consists of four key criteria which include diversity, distinctiveness, naturalness and vital habitat. Therefore, the HEVAE vegetation GDE value layer is a combination of four individual criterion layers. The final or overall HEVAE score was determined for vegetation PCT polygons which has a high probability of being groundwater dependent. This was calculated by adding together the final scores for each criterion (Naturalness, Diversity, Distinctiveness and Vital Habitat). This score was then standardised by dividing by the maximum combined HEVAE score for a whole catchment’s vegetation GDE polygons to provide an even spread of score outcomes between 0 (lowest) and 1 (highest). For ease of data modelling and management, the dataset was divided into the following catchment management areas; Border Rivers-Gwydir, Central Tablelands, Central West, Hawkesbury-Nepean, Hunter-Central Rivers, Lachlan, Lower Murray Darling, Murray, Murrumbidgee, Namoi, Northern Rivers, Southern Rivers, Southern Tablelands, Sydney Metro and Western Division (subdivided further into the IBRA Sub regions).

新南威尔士州水务部（NSW DoI Water）采用了澳大利亚联邦政府制定的《高生态价值水生生态系统识别指南》（High Ecological Value Aquatic Ecosystems，HEVAE）框架。在针对新南威尔士州的当前评估中，HEVAE包含四项核心判定标准，即多样性、独特性、自然性与关键生境。因此，HEVAE植被地下水依赖生态系统（Groundwater Dependent Ecosystem，GDE）价值图层由四项独立的标准图层组合而成。针对极大概率依赖地下水的植被PCT多边形，我们确定了其最终/综合HEVAE评分。该评分通过将四项标准（自然性、多样性、独特性与关键生境）的最终得分相加得到。随后，我们以单个集水区内所有植被GDE多边形的HEVAE综合最高得分作为分母对该评分进行标准化处理，使最终评分均匀分布于0（最低）至1（最高）区间内。为便于数据建模与管理，本数据集按以下集水区管理单元进行划分：边境河流-吉迪尔（Border Rivers-Gwydir）、中部台地（Central Tablelands）、中西部（Central West）、霍克斯伯里-尼皮恩（Hawkesbury-Nepean）、亨特-中央河流（Hunter-Central Rivers）、拉克兰（Lachlan）、下默里-达令（Lower Murray Darling）、默里（Murray）、穆伦比奇（Murrumbidgee）、纳莫伊（Namoi）、北部河流（Northern Rivers）、南部河流（Southern Rivers）、南部台地（Southern Tablelands）、悉尼都会区（Sydney Metro）以及西区（Western Division，该区域进一步细分为澳大利亚临时生物地理分区（Interim Biogeographic Regionalisation for Australia，IBRA）子区）。