Water flow through Vltava water cascade

Problem definition

My task is to simulate water flow through six best known dams on Vltava water cascade. The dams are: Hnevkovice, Orlik, Kamyk, Slapy, Stechovice and Vrane. The principle of the simulation is quite easy - how fast can the individual dams release water without the river between the dams was on third flood stage.

Method

To deal with the problem I have chosen the method to create a simulation in tool for modelling systems dynamics called VentSim. I have used last known version of VentSim 6.2.

Model description

In model there are following entities:

General description

There is randomly generated initial flow and rainfall at the beginning of the simulation, both simulate much increased flow on water cascade, for example, in the spring after the snow and ice melts with bad weather conditions with raifalls. The initial flow is on start of the water cascade - this flow comes from other dams, from other rivers and from rainfall from the mountains. Every dam has two inflows and one outflow. First inflow comes from previous dam, which is located on the water cascade before, second inflow is from rainfall and other rivers, which comes into the flow between two dams.

Every dams has to respond to the increased flow into the dam and increase adequately outflow of the dam.

To better work with the numbers of flow, all flows are in units of thousands. The entire simulation runs in steps of one hour and simulates period for two weeks. This situation roughly corresponds to reality. Therefore, the flow units (which are commonly stated in m3 per second) are multiplied by number 3,600. Thus we get the flow rate per hour.

Dams

Every dam has several attributes:

• minimum flow
• maximum flow
• optimal flow
• minimal capacity
• maximal capacity
• state of 3rd flood level
• first filling coefficient
• second filling coefficient
• third filling coefficient
• first increased flow coefficient
• second increased flow coefficient
• third increased flow coefficient

(. There would be agents: individual dams - they would have attributes such as inflow, outflow, retention, current capacity, the risk of rupturing etc. Between the dams would be used Links that represent the waterway between the dams (attributes: normal flow, current flow, flooding flowrate). These information I am able to find out through the internet.

There would be randomly generated a rainfall (or constant rain) at the beginning of the simulation and they would have an impact on the water cascade. One tick would correspond to one hour, during which time the water is slowly seeping into the ground itself. User would change sliders to make affect to the rate of outflow for individual dams and also there would be settings for weather. Changes in the running simulation would appear on the graph and in a simplified graphical display. I would use NetLogo, because simulation conditions such as a weather conditions and flowout rates of the individual dams can be changed in real time during the simulation, which makes the simulation more interesting and more relevant to reality.