Using surface water flow paths to display saturation gradients.
FlowCatchment component uses the collection of pre-calculated flow paths to calculate the relative amount of surface infiltration across a given landform.
To do so, it takes the points that make up each of the flow paths and identifies the nearest segment of the mesh of surface. That segment then has a ‘volume’ of water added to it. Areas of the landform covered by many sets of flow paths will register as having a greater volume of water.
The precision of this volume is controlled by two parameters, The
Start Volume parameter is a ‘budget’ of water that each flow path represents. The
Segment Loss parameter is the rate of loss that occurs at each point within the flow path. So if a path begins with a
Start Volume of
1000 and a
Segment Loss of
0.1, each point within the path will add
10 to the nearest mesh/surface segment and subtract
10 from the volume assigned to that path. When the flow path ends it discharges all of the remaining volume (if any) at its end point.
Identify the saturation levels across terrain given flow paths
||Base landscape form (as a mesh) for the flow calculation||
||The flow paths as generated by the flows component||
||The quantity of water that each path ‘starts with’||
||The decimal percent (e.g. 0.15 for 15%) of the initial volume that is lost in each segment||
Segment Lossis set to 0 then the
Start Volumevalue will always be used at each point.