For morphodynamic modelling, riverbed survey data are essential as the basis for the evaluation of temporal riverbed development, mesh creation, and model calibration. To study the effects of uncertain geometry input on these issues, datasets of different spatial resolutions were analysed. As a result, cross-profile data were derived from high-resolution survey data, which are available for a river reach in the Upper Danube in Bavaria for several periods. Finally, the prediction quality of simulations based on cross-profile and high-resolution spatial data was assessed. The analysis of both datasets shows continuous riverbed erosion but of different magnitudes. However, complex riverbed geometry due to, e.g., scours, is depicted poorly by cross-profile data. In more homogenously characterised reaches, cross-profile data significantly more closely represents the riverbed geometry than the high-resolution spatial data base. Local misinterpretation of riverbed geometry by cross-profile data leads to deviations of calibration parameters in the entire study area. Consequently, these deviations in calibration outcome effect the model predictions. In this case, cross-profile calibration generally induces higher transport capacities, leading to more erosion in the study area compared to the model based on high-resolution spatial calibration. The general shape of predicted riverbed geometries is found to be similar but with local deviations, which are not limited to areas with complex river geometry.

Floating structures have a wide range of application and shapes. This experimental investigations observes a hexagonal floating structure under wave conditions for three different draft configurations. Regular waves as well as a range of white noise tests were conducted to quantify the response amplitude operator (RAO). Further irregular waves focused on the survivability of the floating structure. The presented dataset includes wave gauge data as well as a six degree of freedom motion measurement to quantify the response only restricted by a soft mooring system. Additional analysis include the measurement of the mass properties of the individual configuration, natural frequency of the mooring system as well as the comparison between requested and measured wave heights. This allows us to use the provided dataset as a validation experiment.

The JANUS mission concept is designed to study the high redshift universe using a small, agile Explorer class observatory. The primary science goals of JANUS are to use high redshift (6<z6 XRFs/GRBs, which can be further studied by other instruments. XCAT would use a coded mask aperture design with hybrid CMOS Si detectors. It would be sensitive to XRFs and GRBs with flux in excess of approximately 240 mCrab. In order to obtain redshift measurements and accurate positions from the NIRT, the spacecraft is designed to rapidly slew to source positions following a GRB trigger from XCAT. XCAT instrument design parameters and science goals are presented in this paper.

The many facets of river hydromorphology are of crucial importance to assess the condition of rivers. Generating new knowledge is the key in achieving the water framework objectives. Therefore, detailed bathymetric information is required for each river system to evaluate the constantly changing morphological structures and to understand hydraulic, morphodynamic and ecological processes. The technology of Airborne LiDAR Bathymetry (ALB) scanning is an innovative remote sensing method for measuring the ́underwater topography ́ of water bodies. ALB is perfectly qualified to meet the requirements at an exceptionally high resolution and sufficient accuracy. The data processing of an ALB point cloud consists of a number of specific work steps to determine the point classification (water surface, bathymetry, vegetation, ground, etc.) and to derive high-quality digital terrain models (DTM). This work shows exemplary the results of an ALB survey of the Mareit/Mareta River in South Tyrol, Italy. First, the applied analysis methodology is presented. Second, the question on the optimal bathymetric resolution for hydraulic and habitat modeling purposes is discussed.