HEVAE Vegetation Groundwater Dependent Ecosystems Value - Murray

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 (MDB and far west subdivided further into the IBRA Sub regions).

新南威尔士州水资源部（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（High Ecological Value Aquatic Ecosystems, HEVAE）识别指南框架。在当前针对新南威尔士州的评估工作中，HEVAE包含四项核心判定标准，分别为多样性、独特性、自然性与关键栖息地。因此，HEVAE植被地下水依赖型生态系统（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，计算得到最终的HEVAE综合得分。该得分通过将四项标准（自然性、多样性、独特性与关键栖息地）的最终得分相加得到。随后，将该得分除以单个集水区内所有植被GDE多边形的HEVAE综合得分最大值以完成标准化处理，使最终得分均匀分布于0（最低值）至1（最高值）的区间范围内。为便于数据建模与管理，本数据集按以下流域管理区进行划分：边境河流-吉德河（Border Rivers-Gwydir）、中部台地（Central Tablelands）、中西部（Central West）、霍克斯伯里-内皮尔（Hawkesbury-Nepean）、亨特-中部河流（Hunter-Central Rivers）、拉克兰（Lachlan）、下默里-达令（Lower Murray Darling）、默里（Murray）、马兰比吉（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）以及西部片区（Western Division，其中默里-达令流域MDB与远西部区域进一步细分为IBRA（Interim Biogeographic Regionalisation for Australia）生物地理亚区）。