River Flow 2020最新文献

{"title":"New approaches to solving the Saint-Venant equations","authors":"B. Hodges, C. Yu, F. Liu","doi":"10.1201/b22619-153","DOIUrl":"https://doi.org/10.1201/b22619-153","url":null,"abstract":"","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123590725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of a porous urban block on urban flood flow patterns","authors":"M. A. Mejía‐Morales, A. Paquier, S. Proust, E. Mignot","doi":"10.1201/b22619-276","DOIUrl":"https://doi.org/10.1201/b22619-276","url":null,"abstract":"Urban flood laboratory experiments usually consider that the flow is mostly concentrated in streets and does not enter the building areas. However, urban blocks might modify the flow patterns at local scale due to the inflows or/and outflows through openings such as gates, windows, doors, etc. To investigate the influence of urban block porosity on flow distribution, flow depth and velocity in the surrounding streets, experiments were performed on a physical model. The results show that the urban block porosity does not substantially affect the discharge distribution in the streets located downstream of the urban block. However, flow depth, velocity and flow rate in the surrounding streets are more strongly modified.","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116953386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large Eddy Simulation for flows through emerged or slightly submerged square obstacles","authors":"M. Oukacine, R. Rtimi, N. Goutal, F. Larrarte, V. Loizeau, S. Benhamadouche, S. Proust","doi":"10.1201/b22619-165","DOIUrl":"https://doi.org/10.1201/b22619-165","url":null,"abstract":"","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116016128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bank erosion in regulated navigable rivers: Towards a process-based model of bank retreat","authors":"Gonzalo Duró, A. Crosato, W. Uijttewaal","doi":"10.1201/b22619-173","DOIUrl":"https://doi.org/10.1201/b22619-173","url":null,"abstract":": After the European Water Framework Directive, riverbanks in several coun­ tries had the protections removed to improve the water quality and the river ecosystem. Par­ ticularly, the Meuse River currently has several kilometres of freely eroding banks, which may have consequences for other river functions such as navigation and flood conveyance. The understanding, quantification and prediction of the morphological evolution of restored banks is thus relevant to manage the integrity of all river functions and improve future restor­ ation practices. This work analyses the results of a recently developed model to estimate bank retreat in regulated waterways and compares them with measured profiles. The model essen­ tially accounts for the major drivers of erosion, i.e., primary and secondary ship waves, con­ siders homogenous cohesive banks, and computes erosion rates through a Partheniades-type of formulation. The results show a good qualitative and quantitative agreement with measure­ ments. Erosion rates are yet not accurate with the current approach, for which future work will focus on improving the temporal representation through the inclusion of other factors and processes affecting erosion rates. These are, for instance, statistically representative time series of ship waves, currents during floods, and elements affecting erosion processes such as mass failures, slump-block dynamics and vegetation.","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123377971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical study of the flow and passive scalar transport in an open-channel confluence with a flat and a degraded fixed bed","authors":"Tian Jin, Pedro Cunha Ramos, L. Schindfessel, T. Mulder","doi":"10.1201/b22619-184","DOIUrl":"https://doi.org/10.1201/b22619-184","url":null,"abstract":": Confluences are important junctions in fluvial and artificial networks of open-channels, as they regulate the mixing phenomena of substances transported by the merging flows, as well as the scour and deposition phenomena. This paper aims at contributing to the study of how the bed morphology, such as the presence of a scour hole and a depositional bar, influences the flow and mixing phenomena at a T-shaped open-channel confluence. By means of Large Eddy Simulations (LES) of flow and passive scalar transport, a comparative numerical study is carried out of two fixed bed cases, i.e. a flat one and a degraded one, which were investigated earlier experimentally in the lab and numerically with a RANS based solver by Tang et al. (2018). The spatial focus of the present paper is not exclusively devoted to the Confluence Hydrodynamics Zone, but also extends somewhat further downstream (i.e. up to 10 post-confluence channel widths W d downstream of the upstream confluence corner). For the investigated flow condition with a dominant incoming flow from the upstream main channel, the recirculation zone in the degraded bed case is found to be significantly shorter and less wide or even absent near the bed, yielding differences in the contraction of the main channel flow and in the secondary flow. Nevertheless, the non-uniformity of passive scalar mixing was found to be very similar up to 3 . 5 W d . Further downstream, the flat bed case shows a slightly higher mixing rate, which does not seem to be related to differences in secondary flow patterns, but rather to differences in turbulence levels.","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125124195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A laboratory and numerical study of transverse momentum exchange in vegetated channels","authors":"S. C. Truong, U. Li, W. Uijttewaal","doi":"10.1201/b22619-135","DOIUrl":"https://doi.org/10.1201/b22619-135","url":null,"abstract":": Transverse exchange processes of mass and momentum in floodplain regions of channels are of primary importance regarding the sediment transport and riverbank stabil­ ity. The presence of large horizontal coherent structures (LHCSs) at the interface of the flood­ plain and main channel regions may contribute up to 90% the amount of transverse momentum exchange between these areas. Although many momentum exchange models have been proposed and developed, their applicability in different circumstances is still unclear as their validity is usually restricted to a narrowly ranging experiment data set. In order to obtain more insight, two unique laboratory experiments of a shallow flow field in a floodplain channel with and without vegetation have been conducted. One small scale experiment was conducted at the TU Delft Water Lab. Another large-scale experiment of floodplain vegetated channel has been conducted at the Korea Institute of Civil Engineering and Building Technol­ ogy - River Experiment Center (KICT-REC). The experimental data has been used to verify state-of-the-art momentum exchange models. As the limitations of these models were ana­ lyzed, a new eddy viscosity model based on the occurrence of LHCSs was proposed and valid­ ated using a variety of experimental data sets. A numerical model mimicking physical models was constructed. The experimental results were compared with the numerical results, showing the capacity of the new eddy viscosity model. Furthermore, the experimental results confirm the presence of LHCSs in a large-scale experiment. The LHCSs have the length of about 15m, which is one order of magnitude larger than that observed in the small-scale experiment.","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130591162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New developments of Fudaa-LSPIV, a user-friendly software to perform river velocity measurements in various flow conditions","authors":"M. Jodeau, C. Bel, G. Antoine, G. Bodart, J. L. Coz, J. Faure, A. Hauet, F. Leclercq, H. Haddad, C. Legoût, Bertrand Marchand","doi":"10.1201/b22619-120","DOIUrl":"https://doi.org/10.1201/b22619-120","url":null,"abstract":"","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"48 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120920599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GIS and remote sensing for tracking morphological changes and vegetation coverage at the reach scale: The Po River case study","authors":"M. Nones, M. Guerrero","doi":"10.1201/b22619-141","DOIUrl":"https://doi.org/10.1201/b22619-141","url":null,"abstract":"","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"300 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121462163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Innovative approach to the design of stilling basin: Improvement of fish migration and scour utilization for energy dissipation","authors":"M. Zukal, P. Fošumpaur, T. Kašpar, M. Králik","doi":"10.1201/b22619-109","DOIUrl":"https://doi.org/10.1201/b22619-109","url":null,"abstract":"An original technical solution was designed for the currently prepared project Dry Retention Reservoir Mělčany (Czech Republic). The approach permits migration permeability and thus meets the current environmental requirements for newly built in-stream hydraulic structures. The design envisages the construction of a 19-meter-high earthfill dam with a combined structure, which contains a migration passage, bottom outlets and spillway. Thus, it allows the protection of the downstream area up to 100-years-flood discharge. The approach to the stilling basin design downstream the combined object is unique. The concrete construction of the 6-meter deep stilling basin is filled with a riprap in which a shallow river channel is modelled to ensure migration permeability and continues through the dam. The riprap material has been designed to resist normal flow rates and, in flood situations, to create an equally large scour that will effectively dissipate the flowing water energy. A variety of known formulas and approaches can be used to predict the size and depth of a scour. However, the amplitude of the results is so wide that the results were unclear and unusable for the design of a particular situation. A physical hydraulic model was created to verify and optimize the proposed stone size and the expected range of scours, and finally, the results were generalized. Conclusions of the hydraulic research confirmed the proposed solution as reliable in terms of dissipating the kinetic energy of water concerning the stability of the downstream river channel. will be filled in with riprap. A river bed will be shaped in it and it will pass through the dam below the sluice gate and further continue to the river bed above the dam. It is generally known that local scour occurs downstream of hydraulic structures with a stilling basin such as dams, weirs etc. owing to a great velocity of the flow of water from the outlet works (Hafez 2016). This phenomenon was utilized in the process of designing the stilling basin to dissipate kinetic energy during heightened discharge situations at the Mělčany hydraulic structure. Therefore, a scour hole is expected to form in the riprap in the concrete stilling basin during flood situations, with the material being washed away, partly or completely, further downstream. The scour hole formed will perform the function of a stilling basin, thereby dissipating the kinetic energy of water. This will protect the river bed from being scoured. A hydraulic jump will occur at the place of the stilling basin during the passage of flood discharges, which causes turbulent flow and scour holes in erosive materials. The turbulent flow due to a hydraulic jump may have a significant impact on the movement of sediment particles and the formation of scour holes (Abbaspour et al. 2016). Hence, the goal of the research was to find such material for the riprap in order that it creates the required scour hole in the stilling basin. The stability of the","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"4 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128705114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A first simulation of a model aquatic canopy at high Cauchy number","authors":"B. Löhrer, D. Doppler, S. Puijalon, N. Rivière, J.J.S. Jerome, J. Fröhlich","doi":"10.1201/b22619-23","DOIUrl":"https://doi.org/10.1201/b22619-23","url":null,"abstract":"","PeriodicalId":349888,"journal":{"name":"River Flow 2020","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115729843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}