TY - CHAP A1 - He, Qianwen A1 - Molkenthin, Frank A1 - Wendland, Frank A1 - Herrmann, Frank T1 - Evaluation of different interpolation schemes for precipitation and reference evapotranspiration and the impact on simulated large-scale water balance in Slovenia T2 - European Geosciences Union, General Assembly 2016, Vienna, Austria N2 - Precipitation and reference evapotranspiration (ET0) are two main climate input components for hydrological models, which are often recorded or calculated based on measuring stations. Interpolation schemes are implemented to regionalize data from measuring stations for distributed hydrological models. This study had been conducted for 5 months, with the aim of: (1) evaluating three interpolation schemes for precipitation and reference evapotranspiration (ET0); (2) assessing the impact of the interpolation schemes on actual evapotranspiration and total runoff simulated by a distributed large-scale water balance model - mGROWA. The study case was the Republic of Slovenia, including a high variability in topography and climatic conditions, with daily meteorological data measured in 20 stations for a period of 44 years. ET0 were computed by both FAO Penman-Monteith equation and Hargreaves equation. The former equation is recommended as the standard equation, while the ET0 calculated by the latter one for Slovenia had a certain deviation (+150 mm/a) from it. Ordinary Kriging, Regression Kriging and Linear Regression were selected to regionalize precipitation and ET0. Reliability of the three interpolation schemes had been assessed based on the residual obtained from cross-validation. Monthly regionalized precipitation and ET0 were subsequently used as climate input for mGROWA model simulation. Evaluation of the interpolation schemes showed that the application of Regression Kriging and Linear Regression led to an acceptable interpolation result for reference evapotranspiration, especially in case the FAO Penman-Monteith equation was used. On the other hand, Regression Kriging also provided a more convincing interpolated result for precipitation. Meanwhile, mGROWA simulation results were affected by climate input data sets generated by applying difference interpolation schemes. Therefore, it is essential to select an appropriate interpolation scheme, in order to generate a convincing climate input. Y1 - 2016 UR - http://meetingorganizer.copernicus.org/EGU2016/EGU2016-8570.pdf N1 - EGU2016-8570 PB - European Geophysical Society CY - Katlenburg-Lindau ER - TY - CHAP A1 - Schley, Frank A1 - Molkenthin, Frank A1 - Mejstrik, M. T1 - Netzbasiertes Kollaborationsmodell im Spezialtiefbau - Virtuelle Baubude - T2 - Junge Wissenschaftler forschen, 13. Forum Bauinformatik, München 2001 Y1 - 2001 SN - 3-18-316904-5 SP - 70 EP - 77 PB - VDI-Verlag CY - Düsseldorf ER - TY - GEN A1 - He, Qianwen A1 - Wendland, Frank A1 - Molkenthin, Frank T1 - The analysis of nitrogen load and simulation uncertainty using SWAT in a catchment with paddy field in China T2 - Water Science & Technology Journal KW - critical source areas KW - hydrological model KW - nitrogen load KW - nitrogen source apportionment KW - SWAT KW - uncertainty analysis Y1 - 2019 U6 - https://doi.org/10.2166/wst.2019.326 SN - 0273-1223 SN - 1996-9732 VL - 80 IS - 4 SP - 806 EP - 816 ER - TY - THES A1 - Molkenthin, Frank T1 - WWW based Hydroinformatics Systems Y1 - 2001 SN - 3-934934-04-8 PB - BTU, Inst. für Bauinformatik CY - Cottbus ER - TY - JOUR A1 - Molkenthin, Frank A1 - Belleudy, Ph. A1 - Holz, Klaus-Peter A1 - Jozsa, J. A1 - Price, R. A1 - Veer, P. van der T1 - Hydro-Web "WWW based Collaborative Engineering in Hydroscience" - a European Education Experiment in the Internet JF - Journal of Hydroinformatics Y1 - 2001 SN - 1464-7141 VL - 3 IS - 4 SP - 239 EP - 243 ER - TY - JOUR A1 - Molkenthin, Frank A1 - Liang, Shin-Jye T1 - A Virtual GIS-based Hydrodynamic Model System for Tamshui River JF - Journal of Hydroinformatics Y1 - 2001 SN - 1464-7141 VL - 3 IS - 4 SP - 195 EP - 202 ER - TY - CHAP A1 - Holz, Klaus-Peter A1 - Hildebrandt, Gerald A1 - Molkenthin, Frank ED - Gnauck, Albrecht T1 - Virtual Laboratories for Projects in Environment Water T2 - The information society and enlargement of the European Union, 17th International Conference Informatics for Environment Protection, Cottbus 2003 N2 - Modern information and communication technology (ICT) enables new technical solutions to support collaboration in environmental engineering over distance. The establishment of "virtual laboratories" including application of Internet based project platforms, distributed team work and collaboration methods require new kinds of soft skills, knowledge and experience and a new "technological culture" to be generated just by doing - a task for education, training and profession in Hydro-Informatics. This is a challenge for the European dimension, where in future experts and engineers from different countries with different languages, different mentalities as well as different specialization and professional experience have to collaborate in research, teaching and practice. Training of collaborating in such new environment is the challenge of the courses HydroWeb and HydroEurope which by collaboration of 23 universities world-wide will help to establish common high quality university teaching courses and establish links between students from the involved countries. The students are solving a given environmental engineering task in distributed teams in the Internet. The students acquired in this course experience in interdisciplinary team work, net based project co-ordination and Web based reporting. They strengthened their social competence to collaborate in heterogeneous teams with members of different habits, nationalities, ages, educational backgrounds. The described experiment might be the basis to introduce Web based collaborative engineering in the regular course programme of water-environment related curricula at universities. Y1 - 2003 SN - 3-89518-440-3 PB - Metropolis-Verlag CY - Marburg ER - TY - JOUR A1 - Holz, Klaus-Peter A1 - Hildebrandt, Gerald A1 - Molkenthin, Frank T1 - Virtual Laboratories for Projects in Environment Water JF - Forum der Forschung N2 - Modern information and communication technology (ICT) enables new technical solutions to support collaboration in environmental engineering over distance. The establishment of "virtual laboratories" including application of Internet based project platforms, distributed team work and collaboration methods require new kinds of soft skills, knowledge and experience and a new "technological culture" to be generated just by doing - a task for education, training and profession in Hydro-Informatics. This is a challenge for the European dimension, where in future experts and engineers from different countries with different languages, different mentalities as well as different specialization and professional experience have to collaborate in research, teaching and practice. Training of collaborating in such new environment is the challenge of the courses HydroWeb and HydroEurope which by collaboration of 23 universities world-wide will help to establish common high quality university teaching courses and establish links between students from the involved countries. The students are solving a given environmental engineering task in distributed teams in the Internet. The students acquired in this course experience in interdisciplinary team work, net based project co-ordination and Web based reporting. They strengthened their social competence to collaborate in heterogeneous teams with members of different habits, nationalities, ages, educational backgrounds. The described experiment might be the basis to introduce Web based collaborative engineering in the regular course programme of water-environment related curricula at universities. Y1 - 2003 SN - 0947-6989 VL - 16 IS - 7 SP - 94 EP - 97 ER - TY - JOUR A1 - Molkenthin, Frank A1 - Holz, Klaus-Peter A1 - Brüggemann, Bernhard Markus A1 - Belleudy, Ph. A1 - Josza, J. A1 - Price, R. A1 - Veer, P. van der T1 - HydroWeb: 'WWW based collaborative engineering in hydroscience' - a European education experiment in the Internet JF - Forum der Forschung Y1 - 2001 VL - 6 IS - 13 SP - 12 EP - 16 ER - TY - CHAP A1 - Molkenthin, Frank A1 - Holz, Klaus-Peter ED - Jun, Byong-Ho T1 - Generalised Information Systems for Physical State Variables in Hydroscience T2 - Water engineering for the future, Vol. 1., Abstracts of XXXI IAHR Congress, Coex, Seoul, September 11 - 16, 2005 Y1 - 2005 SN - 89-87898-25-3 SP - S. 107 PB - Korea Water Resources Association CY - Seoul ER - TY - CHAP A1 - Molkenthin, Frank T1 - Web-based Collaborative Engineering based on Information Sharing Y1 - 2004 ER - TY - CHAP A1 - Molkenthin, Frank T1 - Web-based Inf. Systems: Data Monitoring, Analysis and Re-porting for Measurements and Simulations Y1 - 2004 ER - TY - CHAP A1 - Busse, T. A1 - Simons, F. A1 - Mieth, S. A1 - Hinkelmann, R. A1 - Molkenthin, Frank ED - Hinkelmann, R. ED - Nasermoaddeli, M. H. ED - Liong, S. Y. ED - Savic, D. ED - Fröhle, P. ED - Daemrich, K. F. T1 - HMS: A generalised software design to enhance the modelling of geospatial referenced flow and transport phenomena T2 - Proceedings of 10th International Conference on Hydroinformatics, HIC 2012, understanding changing climate and environment and finding solutions, Hamburg, Germany, July 14 - 18, 2012 Y1 - 2012 SN - 978-3-941492-45-5 PB - TuTech Innovation CY - Hamburg ER - TY - CHAP A1 - Notay, Kunwar Vikramjeet A1 - Stadler, L. A1 - Simons, F. A1 - Molkenthin, Frank A1 - Hinkelmann, R. ED - Hinkelmann, R. ED - Nasermoaddeli, M. H. ED - Liong, S. Y. ED - Savic, D. ED - Fröhle, P. ED - Daemrich, K. F. T1 - Model Coupling in Hydroinformatics Systems through the Use of Autonomous Tensor Objects T2 - Proceedings of 10th International Conference on Hydroinformatics, HIC 2012, understanding changing climate and environment and finding solutions, Hamburg, Germany, July 14 - 18, 2012 Y1 - 2012 SN - 978-3-941492-45-5 PB - TuTech Innovation CY - Hamburg ER - TY - CHAP A1 - Li, Chi-Yu A1 - Notay, Kunwar Vikramjeet A1 - Molkenthin, Frank ED - Hinkelmann, R. ED - Nasermoaddeli, M. H. ED - Liong, S. Y. ED - Savic, D. ED - Fröhle, P. ED - Daemrich, K. F. T1 - Time Series Scenario Composition Framework In Hydroinformatics Systems T2 - Proceedings of 10th International Conference on Hydroinformatics, HIC 2012, understanding changing climate and environment and finding solutions, Hamburg, Germany, July 14 - 18, 2012 Y1 - 2012 SN - 978-3-941492-45-5 PB - TuTech Innovation CY - Hamburg ER - TY - CHAP A1 - Molkenthin, Frank A1 - Li, Chi-Yu A1 - Notay, Kunwar Vikramjeet ED - Gourbesville, Philippe ED - Cunge, Jean ED - Caignaert, Guy T1 - Information Handling in Interdisciplinary Hydro-Environment Engineering Projects T2 - Advances in Hydroinformatics: SIMHYDRO 2012 - New Frontiers of Simulation N2 - Information handling in water related interdisciplinary engineering projects is a demanding challenge due to the mass of data from field work, laboratory experiments and numerical simulation. This paper describes a general concept for information handling in an interdisciplinary research unit using a generalized information modelling approach for multi-scale physical state variables in combination with metadata and Web services based information systems following the INSPIRE initiative. The research unit deals with the coupling of flow and deformation processes for modelling the movement of natural slopes and integrates data and models from different disciplines such as hydrology, hydrodynamics, geo-hydraulics, geo-physics and soil mechanics. Key idea is a generalized information modelling concept for any kind of physical state variables on different spatial and time scales using tensor and set theory from mathematics as well as object-oriented information modelling techniques. Tensor objects are used for the full information handling process from field data acquisition and management via information analysis and model coupling to information archiving and storage. A hydroinformatics system so-called “Turtle” has been developed using standard IC-Technology such as XML schemes for tensor objects (TensorML) and ISO 19115 and 19119 for metadata and geo-portal based interdisciplinary collaboration and long term archiving and reuse of the relevant information. KW - Hydroinformatics KW - Information Systems KW - INSPIRE KW - Model Coupling and Integration Y1 - 2014 UR - http://link.springer.com/chapter/10.1007%2F978-981-4451-42-0_6#page-1 SN - 978-981-4451-42-0 SN - 978-981-4451-41-3 U6 - https://doi.org/10.1007/978-981-4451-42-0_6 SP - 65 EP - 76 PB - Springer CY - Singapore [u.a.] ER - TY - GEN A1 - Nuswantoro, Riyandi A1 - Diermanse, F. A1 - Molkenthin, Frank T1 - Probabilistic flood hazard maps for Jakarta derived from a stochastic rain-storm generator T2 - Journal of Flood Risk Management N2 - Generally, the methods to derive design events in a flood-modelling framework do not take into account the full range of extreme storm events and therefore do not take into account all aleatory uncertainties originating from rainfall intensity and spatial variability. The design event method uses a single simulation in order to represent an extreme event. The study presents a probabilistic method to derive flood inundation maps in an area where rainfall is the predominant cause of flooding. The case study area is the Jakarta Basin, Indonesia. It typically experiences high-intensity and short-duration storms with high spatial variability. The flood hazard estimation framework is a combination of a Monte Carlo (MC)-based simulation and a simplified stochastic storm generator. Several thousands of generated extreme events are run in the Sobek rainfall–runoff and 1D-2D model. A frequency analysis is then conducted at each location in the flood plain in order to derive flood maps. The result shows that in general, design events overestimate the flood maps in comparison with the proposed MC approach. The MC approach takes into account spatial variability of the rainfall. However, this means that there is a need to have a high number of MC-generated events in order to better estimate the extreme quantiles. As a consequence, the MC approach needs much more computational resources and it is time-consuming if a full hydrodynamic model is used. Hence, a simplified flood model may be required to reduce the simulation time. KW - Flood inundation KW - Jakarta Basin KW - Monte Carlo KW - spatial variability KW - uncertainty Y1 - 2016 UR - http://onlinelibrary.wiley.com/doi/10.1111/jfr3.12114/full U6 - https://doi.org/10.1111/jfr3.12114 SN - 1753-318X VL - 9 IS - 2 SP - 105 EP - 124 ER - TY - CHAP A1 - Notay, Kunwar Vikramjeet A1 - Mendoza-Lera, Clara A1 - Federlein, Laura L. A1 - Molkenthin, Frank T1 - A coupled subsurface-flow and metabolism model to study the effects of solute fluxes in the hyporheic zone T2 - Proceedings of the 28th EnviroInfo 2014 Conference, Oldenburg, Germany September 10-12, 2014 N2 - The hyporheic zone and the streambed host a great part of the energy and material fluxes through river ecosystems. However, the role of heterogeneities in the hyporheic zone in metabolism is not clearly understood. This paper proposes a new way to approach the question by using a coupled subsurface-flow and metabolism model for investigating the role of heterogeneities in the hyporheic metabolism. Our results show that (i) our coupled model is feasible for investigating solute fluxes in the hyporheic zone under heterogeneous set-ups, and (ii) the incorporation of heterogeneities seems be of relevance for hyporheic metabolism estimations. Y1 - 2014 UR - http://enviroinfo.eu/sites/default/files/pdfs/vol8514/0293.pdf SN - 978-3-8142-2317-9 PB - BIS-Verlag CY - Oldenburg ER - TY - CHAP A1 - Li, Chi-Yu A1 - Molkenthin, Frank ED - Marx Gómez, Jorge ED - Rapp, Barbara ED - Winter, Andreas ED - Vogel, Ute ED - Sonnenschein, Michael ED - Giesen, Nils T1 - Time Series Scenario Composition Framework in Supporting Environmental Simulation Tasks T2 - EnviroInfo 2014 - 28th International Conference on Informatics for Environmental Protection N2 - To answer the impacts under specific what-if scenarios together with simulation tools has been demanding in different environmental problems. In this contribution, a general software framework for time series scenario composition is proposed to deal with this issue. It is done through providing an interface to process available raw time series data and to compose scenarios of interest. These composed scenarios can be further converted to a set of time series data, e.g. boundary conditions, for simulation tasks in order to investigate the impacts. This software framework contains four modules: data pre-processing, event identification, process identification, and scenario composition. These modules mainly involve Time Series Knowledge Ming (TSKM), fuzzy logic and Multivariate Adaptive Regression Splines (MARS) to extract features from the raw time series data and then interconnect them. These extracted features together with other statistical information form the most basic elements, MetaEvents, for the semi-automatic scenario composition. Besides, a software prototype with two application examples containing measured hydrological and hydrodynamic data are used to demonstrate the benefit of the concept. The results present the capability of reproducing similar time series patterns from specific scenarios comparing to the original ones as well as the capability of generating new artificial time series data from composed scenarios based on the interest of users for simulation tasks. Overall, the framework provides an approach to fill the gap between raw data and simulation tools in engineering suitable manner. Y1 - 2014 UR - http://enviroinfo.eu/sites/default/files/pdfs/vol8514/0247.pdf SN - 978-3-8142-2317-9 SP - 247 EP - 254 PB - BIS-Verlag CY - Oldenburg ER - TY - GEN A1 - Altenkirch, Nora A1 - Zlatanović, Sanja A1 - Woodward, K. Benjamin A1 - Trauth, Nico A1 - Mutz, Michael A1 - Molkenthin, Frank T1 - Untangling hyporheic residence time distributions and whole stream" "metabolism using a hydrological process model T2 - Procedia Engineering N2 - The interaction of the water residence time (RT) in hyporheic sediments with the sediment metabolic rates is believed to be a key factor controlling whole stream metabolism. However, due to the methodological difficulties, there is little data that investigates this fundamental theory of aquatic ecology. Here, we report on progress made to combine numerical modelling with a series of modification to laboratory flumes overcoming methodological difficulties e.g. by creating steady flow paths for assessment of metabolic rates. To model the biogeochemical performance and to validate the model results, sediment structures were introduced in both, the model and the flumes, leading to differing RT distributions. Furthermore, the DOC supply in the flumes was manipulated to test the whole stream metabolic response with regard to RT distributions. In the flumes, hydraulic conditions were assessed using conservative tracer and heat as tracer. Metabolic activity was assessed using oxygen dynamics as a proxy of community respiration (CR). Residence time and metabolic processes were modelled using a multicomponent reactive transport code called MIN3P and calibrated with regard to the hydraulic conditions using the results obtained from the flume experiments. Monod type expressions were used to implement metabolic activity terms in the model. Using the results of the hydrological process model, a sensitivity analysis of the impact of RT distributions on the metabolic activity could yield supporting proof of an existing link between the two. KW - residence times KW - metabolism KW - MIN3P Y1 - 2016 UR - http://www.sciencedirect.com/science/article/pii/S1877705816319877 U6 - https://doi.org/10.1016/j.proeng.2016.07.598 SN - 1877-7058 N1 - 12th International Conference on Hydroinformatics, HIC 2016, Incheon, Korea VL - 154 SP - 1071 EP - 1078 ER -