GroMoPo Metadata for Lake Constance model

The joint project SeeZeichen deals with essential immission pathways of water constituents into Lake Constance. A wide variety of measuring concepts, measuring instruments, and numerical models have been combined with each other in order to achieve a comprehensive representation of the entry of groundwater into Lake Constance. Based on a catchment-wide hydrogeological model, a groundwater model for the Lake Constance region was implemented, which for the first time calculates temporally differentiated and spatially highly-resolved quantitative estimates of groundwater inflows into Lake Constance. With a method toolbox for identifying and quantifying groundwater in lakes, groundwater exfiltration into Lake Constance can be localized and quantified. A multi-parameter water body signature allows to obtain further information on groundwater inflows into the lake. The measured values obtained were interpreted and checked for their plausibility by means of inverse modeling with a spatially high-resolution 3-dimensional hydrodynamic lake model. With a coupled groundwater-lake model, the entire system of hydrogeological context/groundwater and lake can be seamlessly modeled for the first time. Measuring methods, tools and models are also used in Lake Ammersee and Lake Steisslinger See, thus demonstrating the transferability to other lakes and into the general water management practice.