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Extreme LS values and disrupted flow accumulation in SDR erosion model 3.3.1
Extreme LS values and disrupted flow accumulation in SDR erosion model
I am encountering some very high LS values (>500) in my SDR model outputs. These lead to very high USLE values (>500) and often to very high sed_export values. The same pixels also seem to be associated with disjunctions in the flow accumulation layer, where instead of the flow accumulating it splits across multiple pixels and then the flow comes back together. This then leads to the stream layer being broken, since the flow does not accumulate continuously. I do not get this kind of result when I use the same DEM file and the ArcMap flow accumulation tool.
I am assuming all these oddities are connected, but I don’t know precisely how. Has anyone encountered similar issues? I have filled my DEM, using ArcMap. I even did it multiple times just to be sure, but same results. I ran into some similar issues in earlier version of InVEST, but I had to take a break from it for a while and am just now getting back into it. Thanks.