Hodge.WaterResources 0 Posted January 8, 2014 Report Share Posted January 8, 2014 The model inputs for a sediment source in PTM require a standard deviation (in phi) and a median grain size in mm. In order to generate a distribution of particle sizes you would also need a mean particle size. How does PTM (or perhaps an SMS pre-processor) calculate a mean grain size from a median grain size and a distribution?As an example I have been running a simple model to look at what the grain size distribution in the model is like and I get results like this.Model Input:median grain size: 0.088 mmSt Dev. (phi): 1.22Statistics of Model Outputmedian: 0.0879 (mm)mean: 0.1497 (mm)How is the mean calculated? Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.