Namoi HRV ratios

## **Abstract** \n\nThis dataset was derived by the Bioregional Assessment Programme from source datasets. The source datasets are identified in the Lineage field in this metadata statement. The processes undertaken to produce this derived dataset are described in the History field in this metadata statement.\n\n\n\nThree shapefiles containing point features of Namoi subregion surface water nodes with summarised hydrological response variables (HRV) data for zero flow days (ZFD), high flow days (HFD) and annual flow (AF).\n\n## **Purpose** \n\nCreated to facilitate NAM 3-4 product maps.\n\n## **Dataset History** \n\nThe input surface water HRV shape file (AWRAR_NAM_reaches_V2 (GUID: 433a27f1-cee8-499e-970a-607c6a25e979) has been augmented with data from the spreadsheet (NAM_HRVs_interperiod_scatter_spatial_plot_data_v3), by linking to the node number.\n\nFor the Namoi subregion an extra step was required as the node number in the shapefile are not the same as the spreadsheet, so there was a linking table (gauge_node_relation.xlsx).\n\n\n\nFor each dataset, a new shapefile was produced - zero flow days (ZFD), high flow days (HFD) and annual flow (AF).\n\n\n\nThe data taken from the spreadsheet was:\n\nZFD. ZFD_corrected worksheet for ratio data with p_max data coming from ZFD worksheet.\n\nHFD. FD_corrected worksheet for both ratio and amax data\n\nAF. AF_corrected worksheet for both ratio and amax data\n\n\n\nMaps use the ratio data for mapping with classes shown on maps except where the following was true, the ratio was replaced with 'no significant change'\n\n\n\namax for LFD

## **摘要**

本数据集由生物区域评估计划（Bioregional Assessment Programme）基于源数据集衍生生成。本元数据声明的“谱系（Lineage）”字段已列明源数据集的相关信息，而本衍生数据集的生成流程则详见“历史（History）”字段。

本数据集包含3个形状文件（shapefile），内含纳米亚子区域（Namoi subregion）地表水节点的点要素，并附带经汇总的水文响应变量（Hydrological Response Variable, HRV）数据，涵盖零流量日（Zero Flow Days, ZFD）、高流量日（High Flow Days, HFD）及年径流量（Annual Flow, AF）三类指标。

## **数据集用途**

本数据集旨在辅助生成NAM 3-4系列产品地图。

## **数据集生成历史**

本次生成通过节点编号关联，将电子表格`NAM_HRVs_interperiod_scatter_spatial_plot_data_v3`中的数据增补至输入地表水HRV形状文件`AWRAR_NAM_reaches_V2`（全局唯一标识符（GUID）：433a27f1-cee8-499e-970a-607c6a25e979）中。

针对纳米亚子区域，由于形状文件中的节点编号与电子表格中的节点编号不一致，因此需通过关联表`gauge_node_relation.xlsx`完成数据匹配。

针对三类指标分别生成了新的形状文件，即零流量日（ZFD）、高流量日（HFD）及年径流量（AF）数据集。

从电子表格中提取的数据如下：
- 零流量日（ZFD）：采用`ZFD_corrected`工作表中的比值数据，其中p_max数据取自`ZFD`工作表。
- 高流量日（HFD）：采用`FD_corrected`工作表中的比值数据与amax数据。
- 年径流量（AF）：采用`AF_corrected`工作表中的比值数据与amax数据。

地图制作时将采用比值数据进行符号分级展示，仅当满足特定条件时，将用“无显著变化”替代原比值数据。

低流量日（LFD）对应的amax数据。