HEVAE Vegetation Groundwater Dependent Ecosystems Value - Namoi

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）识别框架。在针对新南威尔士州的现行评估中，HEVAE框架包含四项核心标准，即多样性、独特性、自然性与关键生境。因此，HEVAE植被地下水依赖型生态系统（Groundwater Dependent Ecosystem, GDE）价值图层由四个独立的标准子图层组合而成。针对具备高地下水依赖概率的植被PCT多边形，确定了最终（总体）HEVAE得分：该得分通过将四项标准（自然性、多样性、独特性与关键生境）的最终得分相加计算得出。随后，通过除以单个流域内所有植被地下水依赖型生态系统多边形的最高组合HEVAE得分，对该得分进行标准化处理，使得分结果均匀分布于0（最低值）至1（最高值）区间。为便于数据建模与管理，本数据集被划分为以下流域管理分区：边境河流-吉迪尔、中部台地、中西部、霍克斯伯里-内皮恩、亨特-中央河流域、拉克伦河、下默里-达令、默里河、马兰比吉河、纳莫伊河、北部河流区、南部河流区、南部台地、悉尼都会区以及西部分区（其中默里-达令盆地（Murray-Darling Basin, MDB）与远西部区域进一步细分为澳大利亚临时生物地理区域亚区（Interim Biogeographic Regionalisation for Australia Subregions, IBRA Subregions））。