South East Regional Water Balance Model Historical Groundwater Extraction Dataset 1970-2013

As part of the Goyder Institute for Water Research funded South East Regional Water Balance project, a historical groundwater extraction dataset was produced for a large portion of the South East of South Australia. The objective of the dataset was to provide inputs for a regional groundwater flow model.The basis for the dataset was a metered groundwater extraction dataset for 2009-2013, provided by DEWNR. The metered dataset contained 3,812 metered groundwater extraction records. A quality check removed obvious errors and issues with inconsistent reading dates. Meter records were merged where they related to the same extraction well but different time periods. The extraction records were then assigned locations. Geographical coordinates were assigned to the meter records based on meter position data provided by DEWNR. Meter position data was not available for 1,032 wells, so the extraction volumes for these wells were distributed evenly across those wells with geographical coordinates in the corresponding groundwater management areas. This ensured that water balances were correct at least at the management area scale, but provides a source of error, particularly if this dataset is to be used in local scale groundwater models.Extraction commencement dates were assigned to the meter records using a variety of methods with varying uncertainty associated with them. Historical groundwater extraction from 1970 to 2014 was then estimated using the average annual groundwater extraction rate for an individual bore was assumed to be constant over time. Records for the metered period (2009/10 – 2012/13) were applied to preceding years since extraction commenced at each location.This study was supported by The Goyder Institute for Water Research.Date coverage: 1970 - 2013Location:- South East of South Australia.- GDA94 MGA Zone 54 Approx. E377,300 m, N5,770,000 m in the south-west and E565,300 m, N5,994,000 m in the north-east.

作为Goyder水研究中心资助的东南区域水资源平衡项目的一部分，针对南澳大利亚东南部的大部分地区，编制了一个历史地下水提取数据集。该数据集旨在为区域地下水流动模型提供输入。数据集的编制基础为DEWNR提供的2009-2013年计量地下水提取数据集，其中包含3,812条计量地下水提取记录。经过质量检查，去除了明显的错误和读数日期不一致的问题。对于同一提取井在不同时间段内的计量记录进行了合并。随后，提取记录被赋予了地理位置。基于DEWNR提供的计量位置数据，为计量记录分配了地理坐标。对于1,032个井的计量位置数据不可用，因此将这些井的提取量均匀分配到相应地下水管理区域内的具有地理坐标的井中。这确保了至少在管理区域尺度上水的平衡是正确的，但若该数据集用于局部尺度地下水模型时，这将成为一个误差来源。使用多种方法为计量记录分配了提取开始日期，并伴随着不同的不确定性。然后，假设单个井的地下水提取年率在时间上保持恒定，对1970年至2014年的历史地下水提取进行了估算。将计量期间（2009/10至2012/13年）的记录应用于前期年份，因为每个位置的提取都是同时开始的。本研究得到了Goyder水研究中心的支持。数据覆盖范围：1970-2013年。地理位置：南澳大利亚东南部。- GDA94 MGA区域54，西南部约为E377,300 m，N5,770,000 m，东北部约为E565,300 m，N5,994,000 m。