HEVAE Vegetation Groundwater Dependent Ecosystems Value - Lachlan

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（High Ecological Value Aquatic Ecosystems，简称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、自然性与关键生境。因此，HEVAE植被地下水依赖生态系统（Groundwater Dependent Ecosystems，简称GDE）价值图层由四项独立的标准图层整合而成。最终的整体HEVAE得分针对极大概率依赖地下水的植被PCT多边形计算得出，具体方式为将自然性、多样性、独特性与关键生境四项标准的最终得分相加求和。随后通过除以整个流域内植被GDE多边形的最大合并HEVAE得分对该总分进行标准化处理，使得得分结果均匀分布于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，本数据集被划分为以下流域管理区域：边境河流-吉德（Border Rivers-Gwydir）、中部台地（Central Tablelands）、中西部（Central West）、霍克斯伯里-内皮恩（Hawkesbury-Nepean）、亨特-中部河流（Hunter-Central Rivers）、拉克伦（Lachlan）、下墨累-达令（Lower Murray Darling）、墨累（Murray）、默伦比奇（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），其中墨累-达令盆地与远西区进一步依据IBRA亚区域进行细分。