What are the ways to improve satellite rain with a minimum of BIAS? Will the resolution of the DEM 90m.30m 10m and 5m digital elevation model affect the flood forecast?
yes, DEM resolution is to affect in flood forecast, if you take 5m resolution DEM then you get a better accurate result than 10, 30,90 M resolution DEM.
You can use the ALOS Polsar DEM for flood mapping
https://asf.alaska.edu/data-sets/derived-data-sets/alos-palsar-rtc/alos-palsar-radiometric-terrain-correction/#dem_information
Yes the DEM resolution will definitely affect your results. The finer the DEM the more accurate your results
Dear Hafiz
An improvement in the resolution of your DEM will improve the accuracy of your flood forecasting model. However, the extent to which the accuracy is improved depends on a variety of factors including the catchment area. If the catchment draining to your downstream forecasting point is large (e.g. several thousand square kilometres) then a 90 m resolution grid DEM may be fine and the differences in the accuracy of the forecast you'll see between using a 90 metre and a 5 metre grid DEM may be minimal to negligible. It also depends on the type of hydrological model that you're using. I've worked on flood forecasting projects where the resolution of the DEM has NOT been key to improving the forecasting accuracy. Often the most significant factor is the accuracy of the rainfall forecast.
I hope that this is of help.
Darren
Sir Darren Lumbroso I am using the IFAS model for flood forecasting. I actually want to improve the precision of the model. Please guide me on all the factors that will affect the performance of the model.
Dear Hafiz
There are many factors that will affect the accuracy of your model. Is suggest that you look at some of the papers which are readily available on Research Gate.
Best regards
Darren
The most important determinant that affects the accuracy of flood forecasts is the projected climate conditions (rainfall, snow, temperature and their temporal and spatial distribution). Of course, other aspects of the model are important, but if the climate forecast is not accurate, then all else becomes ineffective. And, very frequently, the climate forecast is inadequate. Sadly, many engineers do not realize this and keep on polishing the other aspects of the forecasting model.
- Badges
- Science topic
- Similar topics
- Geoscience
- Cartography
- Mapping