Basically, the hydrostratigraphic model is a very important part of the conceptual model for DK model HIP. The purpose of the dataset is to inform users of how calculation layers in ‘DK-model HIP’ 100 meters and 500 meters are related to the basic mapping model from FOHM, and to clarify which layers have been merged into DK model HIP. The hydrostratigraphic model is a prerequisite for the use of marginal condition data from DK model HIP, and for understanding representativeness and possible uncertainties that may be on estimated paramet values etc.
For the islands, the main principle is that the calculation layers follow the hydrostratigraphic model of switching between clay and sand units (magazines). The calculation layer immediately above the lime layer contains both the lower 56 G E U S quartet clay unit (KL5 and KL4 for DK1-DK2 and DK3, respectively), and the paleocene clay (PL1). In the quartet package (below the top layer), a calculation layer is defined for each of the vertical levels of sand bodies. These layers are laid in by using the top and bottom of the interpreted sand bodies. In areas where the sand bodies exist, the top and bottom of the calculation layer coincides with the top and bottom of the sand body. In areas without sand, no thickness of the sand bodies is defined in the hydrostratigraphic model, i.e. the top and bottom coincide, for these areas a minimum thickness of 0.5 m has been applied for the calculation layers automatically generated by MIKE SHE during the pre-processing process. Between each sand layer, calculation layers are defined for the representation of the quartet clay. On Zealand, the prequartary clay is found only in the western part, which is incorporated as a lens in the same way as the sand units, where the prequartary surface is used as a top while the lime is the lower limit. The numerical model thus consists of 9 and 11 calculation layers for Funen and Zealand/South Sea Islands respectively. Similar to the numerical model for the islands, the top calculation layer for the whole of Jutland is through with a fixed thickness of 2 m, represented by the geological units in the earth map. The total hydrostratigraphic model of Jutland is defined by 25 surfaces, describing six vertically arranged sand units in the quartet package and six levels of sand in the prequartary layer package as well as a lime unit. The lime unit is bounded downwards to 50 m below the top of the lime. There is, however, a considerable variation in the distribution of the individual sand units in the three sub-models for Jutland and therefore also in the layout of the numerical model in terms of the number of calculation layers. Here the basis is the layering cycles of the hydrostratigraphic model, where layers with a significant propagation and mightyness are included as calculation layers, while layers with smaller distribution and thickness have been merged into one calculation layer. The quartet and prequartary sand bodies are put into the model by using their interpreted top and bottom. Thus, in areas where the hydrostratigraphic units exist, the top and bottom of the calculation layer coincide with the top and bottom of the hydrostratigraphic unit. In areas where the hydrostratigraphic unit does not exist, i.e. the top and bottom coincide, a minimum thickness of 0.5 m has been applied for the calculation layers automatically generated by MIKE SHE during the pre-processing process. Between each layer of sand, calculation layers are defined to represent the clay between the different levels of sand bodies. In DK model HIP, several layers of quartet and prequartar have been merged to reach a maximum of 11 calculation layers, e.g. kl1-ks2-kl2-ks2. The hydrogeological interpretation for Bornholm is based on a pixel interpretation, and no actual hydrostratigraphic model has been developed that delimits geological units with similar hydraulic properties. This is due to the complex geological construction of Bornholm, which is hydraulically complicated by cracks. The top calculation layer is here bounded to the top 3 m, with a mixture of sand, clay and other from the earthy map. Under the top layer, 6 computation layers are defined, the first of which contains the quartet deposits, with the exception of deposits in the deep valley structures. The next four computation sheets divide the cracked bedrock and the bottom layer form the base layer of mainly non-crested rocks,
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