Long-term Changes of the Tidal Amplitudes and Phases in the Elbe Estuary

Climate Change, Adaptation and Long-Term Prediction

The Residence Time in the Elbe River Focussing on the Estuary

Eco-Hydraulics and Eco-Hydrolog

A Powerful Method of Measuring Sea Wave Spectra and their Direction

Remote Sensing and Field Monitorin

Studies of tracer transport in the river Elbe

Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732Accidental river pollution is a severe hazard to all rivers. To mitigate the consequences of a possible contamination of the river Elbe the contaminant transport model ALAMO (alarm model Elbe) was developed. This dead-zone-model (DZM) was calibrated and verified by nine dye experiments. The experimental set-up comprises measurements with in-situ and ex-situ fluorometers and fluorescence spectrometers. The experiments were carried out for a wide range of discharge conditions. In order to account for different discharges the model coefficients of longitudinal dispersion and lateral exchange were parameterized by a power-law relationship depending on the river geometry. A comparison of the experimentally determined tracer concentration curves with those derived with ALAMO gave good agreement. The error of the time of travel, the width and the asymmetry of the tracer cloud amounts to 8 %, 10 % and 12 % at a maximum

Results of Operational Sea-Wave Monitoring with Radar Gauges

The German Federal Institute of Hydrology (BfG) developed a low-cost, non-contact sea-wave monitoring system based on a single radar sensor. A short description of the measuring system and the analysis of wave parameters is given. Furthermore, long-term wave measurements with this system, in combination with wind-measurements and statistics, are used to analyse possible future changes in wave heights. The results are in good agreement with those of other methods. Due to the good results achieved with the single radar sensor, an extension of the system which will be capable of recording directional information, is now under development. First results are presented in this study.El Instituto Federal Alemán de Hidrología (BfG) ha desarrollado un sistema de seguimiento de bajo coste, que no tiene contacto con la ola, basado en un sensor con un único radar. Se proporciona en el presente artículo una breve descripción del sistema de medición y del análisis de los parámetros de las olas. Además, las mediciones de olas por periodos largos efectuadas con este sistema, en combinación con las medidas del viento y las estadísti-cas, se utilizan para analizar los posibles cambios futuros en las alturas de las olas. Los resultados concuerdan con aquellos obtenidos mediante otros métodos. Debido a los buenos resultados obtenidos con el sensor de radar único, una extensión del sistema, que está ahora en fase de desarrollo, podrá registrar la información direccional. En este estudio se presentan los primeros resultados.L’Institut fédéral allemand d’hydrologie (BfG) a élaboré un système peu onéreux de surveillance à distance des vagues à partir d’un unique sondeur radar. Une brève description du système de mesure ainsi que l’analyse des paramètres des vagues est donnée. De plus, les mesures à long-terme des vagues avec ce système, combinées avec les mesures du vent et les statistiques sont utilisées pour analyser les changements futurs possibles des hauteurs de vagues. Les résultats concordent avec ceux établis au moyen d’autres méthodes. Du fait des bons résultats de l’unique sondeur radar, une extension du système qui pourrait enregistrer des informations relatives à la direction, est actuellement en cours de développement. Les premiers résultats sont présentés dans cette étud

Biofilms in the gravity sewer interfaces: making a friend from a foe

Sewer systems are an integral part of our modern civilization and are an imperative underground infrastructure asset that our society relies on. In Western Europe alone, 92% of the resident pollution is connected to sewer systems. This extensive coverage of sewerage systems presents an ideal habitation for microorganisms to strive. Sewers can be considered continuous flow bioreactors. They are always colonized by bacteria, either in a planktonic state traveling along the pipe with the water flow or dragged in sediment, or organized as biofilms. Many studies have been devoted to the detrimental effects of microorganisms on sewer systems made of concrete. However, their metabolic activity can also be beneficial, lead to more effective wastewater treatment, or be beneficial for concrete pipes. This aspect has not been thoroughly studied to date and requires further investigation. Therefore, in this Review, we highlighted the positive and negative activity of biofilms and their participation in five proposed mass exchange points in gravity sewers. Furthermore, we systematized and reviewed state of the art regarding methods that could be potentially used to remove or engineer these biological structures to increase the sustainability of sewers and achieve a better pre-treatment of wastewater. We have also indicated research gaps that could be followed in future studies.TU Berlin, Open-Access-Mittel – 2021DFG, 248198858, GRK 2032: Grenzzonen in urbanen Wassersysteme