Large-scale hydro-geological characterization of flow systems in an alpine region (Northern Tyrol, Austria)

353-355

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200208942

14th Congress INTERPRAEVENT 2021 May 31st to June 2nd 2021 Virtual Congress, Norway: Natural hazards in a changing world ; 14 (2021) , 353-355

Keywords: precipitation-runoff model, design flood estimation, runoff type classification, flow system, ZEMOKOST
Pilot tests in the Eastern Tyrol have shown that the manually mapped stream network is too sparse. In comparison, our semi-automatic method, despite all the editing, leads to a more consistent network of high density. It is important to include the temporary streams, which appear above the spring lines following extreme precipitation. All of the Northern Tyrol has been mapped (example Figure 1). Pirkl’s (2016) classification turned out to be readily usable in all areas where crystalline rocks predominate, while sub-classes had to be added for the NCA. The descriptive parts were refined by hydro-geological information and mapping criteria. First attempts at implementing subsurface flow in ZEMOKOST indicate a sizable but plausible impact on the results. A detailed description of the workflow is planned to make the method available for other regions and operators.