Dynamic Reservoir Simulation Model - Computational Aquatic Ecosystem Dynamics Model (DYRESM- CAEDYM)

Purpose

These models assist in the estimation of the impact of different forcing functions (e.g. climate and inflows) and management options on water quality, with a focus on transport, temperature, chlorophyll, nutrients and dissolved oxygen.

Description

DYRESM – CAEDYM is a one dimensional hydrodynamic-ecological model that can be used to investigate the interactions between physical, chemical and biological processes that occur in lakes and reservoirs over time scales ranging from days to seasonal to interannual.

Fast-running coupled hydrodynamic-ecological model intended for simulation and prediction of water quality in lakes and reservoirs.

Two models: a 1-D hydrodynamic model that can be coupled with CAEDYM for 1-D model outputs (vertically resolved), and a 3-D hydrodynamic model that can be coupled with CAEDYM for 3-D model outputs.

The model has been developed by the Centre for Water Research (The University of Western Australia) and have been used in policy formulation and policy implementation.

The Centre for Water Research was closed in 2015, previous links to information on these models are now not available.

 

 

Latest Version V4.0 (2012)
State of Development Released and final
Current Development Activity Development was coordinated through Centre for Water Research, The University of Western Australia

Development Contact

Scope

Outcome Areas Environmental
Management Domains Freshwater, Coastal
Subdomains river and estuary water quality
Intended End Users
  • Researcher
Spatial Resolutions 10-100m
Spatial Extents Local (i.e. Catchment or District)
Spatial Dimensions 1D, 3D
Temporal Resolutions Hours, Decades
Temporal Extents Days, Months, Years, Decades
Steady State or Dynamic Dynamic
Level of Integration Environmental

Input & Output Data

Key Input Data Temperature, Rainfall, Runoff Environmental: Lake water quality
Input Data Formats ASCI
Key Output Data Environmental: Lake water quality
Output Data Formats ASCI, Image File(s), Animations/video, Text File(s) Also has governing software for different output options

Accessibility

Open/Closed Source Closed Source
Licence Type Executable
Licence Cost
(Commercial)		 Price negotiable
Licence Purchase Contact
?
The University of Western Australia
University of Western Australia
M023
35 Stirling Highway
Crawley 6009
Western Australia
Australia

User Information

Operating Systems MS Windows, Mac OS X, Linux, Dos executable
Software Needed Matlab useful but not essential
User Interface Other (please specify) ARMS - part of the model package
Ease of Use Moderate Level will vary - details of water quality calibration can be complex and may require extensive collaboration/background for good model results.
Use in Policy Process Plan (Policy Formulation), Do (Policy Implementation)

Technical Considerations

Programming Language Fortran 95
Methods included for calibration and validation Auto-calibration is in development
Methods included for managing uncertainty Sensitivity analysis has been documented in peer reviewed publications
Analytical Techniques Input/output, Scenario Planning
Model Structure

DYRESM CAEDYM model Fig2

Model structure diagram - has been published in numerous papers
Keywords water quality, lakes, reservoirs, transport, temperature, management
Linkages to other Models
  • Catchment Land Use for Environmental Sustainability (CLUES)
  • Rotorua Taupo Nitrogen Model (ROTAN-Annual)

  • Has used output from other models that relate to catchment outputs (e.g. ROTAN, SWAT) or climate (e.g. SIMCLIM).

    ELCOM-CAEDYM is the three-dimensional counterpart of DYRESM-CAEDYM. ELCOM– CAEDYM is a three dimensional hydrodynamic-ecological model that can be used to investigate the interactions between physical, chemical and biological processes that occur in lakes and reservoirs over time scales ranging from days up to one year, with particular emphasis on spatial variability.

    Both models have been developed by the Centre for Water Research (The University of Western Australia) and have been used in policy formulation and policy implementation.
Key References

Burger, D.F., Hamilton, D.P. and Pilditch, C.A., 2008, Modelling the relative importance of internal and external nutrient loads on water column nutrient concentrations and phytoplankton biomass in a shallow polymictic lake, Ecological Modelling, 211(3-4): 411-423.

Trolle, D., Hamilton, D.P., Pilditch, C.A., Duggan, I.C. and Jeppesen, E., 2011, Predicting the effects of climate change on trophic status of three morphologically varying lakes: Implications for lake restoration and management, Environmental Modelling and Software, 26(4): 354-370. [Application to Lakes Okareka, Ellesmere, Rotoehu]

Paul, W., Özkundakci, D. and D. P. Hamilton, 2008. Modelling of restoration scenarios for Lake Ngaroto. Centre for Biodiversity and Ecology Research Report No. 81, The University of Waikato, Hamilton. (DYRESM-CAEDYM application to Lake Ngaroto)

Özkundakci, D., Hamilton, D. P. & Trolle, D., 2011: Modelling the response of a highly eutrophic lake to reductions in external and internal nutrient loading. New Zealand Journal of Marine and Freshwater Research 45: 165-185. (Application to Lake Okaro)

Hamilton D, McBride C, Uraoka T 2005. Lake Rotoiti fieldwork and modelling to support considerations of Ohau channel diversion from Lake Rotoiti.(http://www.envbop.govt.nz/water/media/pdf/Lakes_LakeRotoitiModelling.pdf)

Associated Case Studies

DYRESM-CAEDYM - Ohau Channel diversion, Lake Rotoiti

This case study outlines some of the work undertaken by NIWA and the University of Waikato to investigate a partial or complete diversion of the Ohau Channel (which flows between Lake Rotorua and Lake Rotoiti in the central north island, New Zealand) towards the Kaituna River.

 

DYRESM-CAEDYM - Waituna Lagoon

The need for increased biodiversity management arose given that the Waituna Lagoon which is a part of the wider Awarua Wetland complex were collectively designated a Ramsar site, signifying a wetland of international importance.

 

Other Key Case Studies

Lake Tikitapu (Bay of Plenty): McBride, C.G. et al (2016): A water quality model for Lake Tikitapu. Client report prepared for Bay of Plenty Regional Council. Environmental Research Institute Report No. 71, The University of Waikato, Hamilton. 38 pp

Modelling calculates catchment and lake water balances and estimates nutrient loads to the lake.

Lake Benmore (Canterbury): Spigel, B et al (2015): Updated model assessment of increased nutrient loads in Lake Benmore. NIWA Client Report No: CHC2015-089, prepared for Environment Canterbury

The model was used to predict the relationship between nutrient load and measures of lake condition e.g TLI and to test possible scenarios involving increasing nutrient loads