River Murray Floodplain Groundwater Model 2015: Salinity dynamics of the River Murray floodplain in South Australia

Groundwater models produced from GOYDER INSTITUTE FOR WATER RESEARCH Project No. E1.11.A series of numerical groundwater models have been designed to represent generic floodplain conditions that exist along the River Murray in SA, from the border to Lock 1. The aim is to improve understanding and modelling capability of flow and salinity dynamics, to assist with management and engineering decisions.Multiple base case scenarios are considered, varying by floodplain topography, the presence or local absence of a lock, and whether the river conditions are gaining, throughflow or losing. Model variants were developed to investigate how results depended on the methods used to simulate key processes, including river level changes, floodplain inundation, groundwater evapotranspiration, and solute transport.The MODFLOW and MT3DMS simulations were developed using Groundwater Vistas version 6. Some data inputs were pre-processed using scripts in Python 2.7.6.0. Post-processing was done with both Groundwater Vistas and Python.Model parameters are informed by an amalgamation of data from the study area, but are not specific to any one location. Where there is a wide range of possible parameters, values from the Pike Floodplain have been adopted. Where no local field data exists, values were used from the literature and/or from DEWNR’s Salinity Register regional models.As the Goyder Floodplain Model is a synthetic model, in that it does not model a specific location, no detailed calibration was possible. However, the models were constrained based on the current knowledge of floodplains along the SA River Murray, such as in-stream geophysics, estimated actual evapotranspiration, and Run of River estimates of groundwater salt flux to the river.Location:- South Australia, Australia- The models simulate a generic domain representing conditions in the River Murray floodplain between the SA Border and Lock 1. Conditions are similar upstream of the SA Border as far as Nangiloc-Colignan.

本数据集包含戈耶德水研究学院（GOYDER INSTITUTE FOR WATER RESEARCH）E1.11.A项目产出的地下水模型。一系列数值地下水模型被设计用于复现南澳大利亚州（South Australia，简称SA）墨累河沿岸从州界至1号船闸的典型泛洪平原水文条件，旨在提升对水流与盐度动态过程的认知与模拟能力，辅助管理决策与工程设计工作。

研究设置多组基准情景，情景差异涵盖泛洪平原地形、船闸的局部存在或缺失状态，以及河道处于补给型、通流型还是排泄型的水文条件。此外，团队开发了多款模型变体，用于探究不同关键过程模拟方法对模拟结果的影响，涉及的关键过程包括河道水位变化、泛洪平原淹没、地下水蒸散发以及溶质运移。

本研究采用MODFLOW与MT3DMS进行数值模拟，并借助地下水可视化建模软件（Groundwater Vistas）6.0版本完成操作。部分数据输入项通过Python 2.7.6.0脚本完成预处理，后处理环节则同时使用Groundwater Vistas与Python实现。

模型参数整合了研究区域的多源观测数据，但并未针对任意单一点位定制。当参数存在较大取值区间时，采用派克泛洪平原（Pike Floodplain）的参数取值；若无本地实测数据，则参考相关文献以及DEWNR盐度登记处的区域模型参数。

由于戈耶德泛洪平原模型（Goyder Floodplain Model）属于通用合成模型，未针对特定点位开展建模，因此无法进行详细校准。不过，所有模型均基于南澳州墨累河沿岸泛洪平原的现有认知进行约束，约束依据包括河道地球物理数据、实际蒸散发估算值，以及基于河道径流量估算的地下水盐通量至河道的数值。

数据集应用范围：
- 澳大利亚南澳大利亚州
- 模型模拟的通用区域覆盖南澳州界至1号船闸之间的墨累河泛洪平原，南澳州界上游至Nangiloc-Colignan区域的水文条件与该模拟区域类似。