Extreme weather events such as flooding, hurricanes and storm surge put extra pressure on coastal defenses and adjoining regions. Forecasting and warning services for natural disasters can help save lives but often require installation of flood forecasting and warning systems, along with decision support systems.
Salinity intrusion is of growing concern in many regions where natural fresh water flows are impacted because of direct human activity such urbanization and dam construction, as well as climate change. Mathematical model of these natural systems can be efficiently used for estimating and evaluating the nature of the salinity intrusions on a seasonal and long-term basis.
Changing atmospheric temperatures affects water temperature and has adverse impact on a wide range of aquatic life. Simulation of the thermal regime coupled with forecast temperature scenarios helps regulators minimize the impacts of climate change and evaluate mitigation options.
Adapting to rising sea levels and mitigating the impacts of storm surges and associated flooding is a pressing need in coastal areas.
Salinity intrusion is of growing concern in many regions where natural fresh water flows are impacted because of direct human activity such as urbanization and dam construction, and sea-level rise due to climate change. Estimating and evaluating the nature of the salinity intrusions on a seasonal and multi-year basis is a complicated process for which numerical modeling can bring great benefits.
Instream habitat suitability studies are required for a wide variety of planning applications where aquatic organisms are an important consideration in the decision-making process. At certain flows, for example, the water may be too fast for juvenile fish or velocities may be too high for fish to spawn. At other flows, the water may be too shallow for spawning or suitable spawning gravel may not be covered by water.
Water temperature has significant and systematic effects on biological processes at all levels of organization, from phytoplankton to whole ecosystems. In addition to its own effects, temperature influences several other parameters and can alter the physical and chemical properties of water such as dissolved oxygen and photosynthesis production. Some organisms, particularly aquatic plants, flourish in warmer temperatures, while some fishes such as trout and salmon prefer colder streams.
Once-through Cooling Systems Thermoelectric power plants often make use of once-through cooling (OTC), a system whereby the water from nearby waterbodies is circulated through pipes to absorb heat from the steam in the condensers. The emission of this heated water back into the waterbody can have significant ecological impacts. For example EFDC+ has been used…
Stratified Lakes Large steep sided lakes with slow moving water are an example of where sharp thermoclines are often found in the summer months. The hypolimnion is often depleted of oxygen at this time due to the biological oxygen demand of bacterial decomposers. At depth there is also reduced photosynthetic activity. The density differences results…
The Asian continent is home to many unique bodies of water that draw intrigue from tourists and travelers around the world. From the waters of the Caspian (the world’s largest landlocked body….
What does a completely encased ice house have in common with rising lake levels? They are both phenomenon happening at Lake Ontario, one of the five Great Lakes along the border between the…
There’s no doubt the waterways of Europe are tourist attractions in themselves, drawing millions to stroll the banks of the River Thames in London and the River Seine in Paris every year….
This is the first in a three-part blog series that provides an introduction to hydrodynamic modeling, an overview of how models work, and, finally, an exploration of their many applications…
The latest EFDCPlus/EFDC_Explorer Modeling System, version EE8.2, has now been released. This update of DSI’s hydrodynamic, sediment transport and WQ modeling tool comes with enhancements to better support Sandia National Lab’s developments to EFDC, namely the SEDZLJ sediment transport model, and the Marine & Hydrokinetics module, and much more.
Alberta Environment and Parks recently awarded DSI the contract for a hydrodynamic and water quality model of the upper Little Bow River main stem, including the Twin Valley Reservoir, and its tributary Mosquito Creek. DSI is using EFDC for the set-up, calibration, validation and implementation of this in-stream water quality model.
The Dynamic Solutions International (DSI) version of EFDC is called EFDC+ (formerly EFDC_DSI)…
This past weekend, a major fish die-off occurred in West Lake, the largest freshwater lake located in Vietnam’s capital of Hanoi….
The U.S. Department of Energy has the answer with its recently released forecast and roadmap for hydropower from the present to the year 2050. Among the findings, researchers….
Lake Washington is second largest natural lake in the State of Washington, USA. It is lake with steeply sloping sides and also has long-term, high quality vertical temperature records. This makes it an ideal case to test the Sigma-Zed layering approach. DSI developed a hydrodynamic model of this water body with 1,183 cells and 55 layers to assess the accuracy for prediction of the epilimnion and hypolimnion.
DSI has developed an improved version of the EFDC code to help deal with pressure gradient errors that occur in simulations that have steep changes in bed elevation….