Notes on Bed Load Transport under Unsteady Flow Conditions

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive

Role of Heat Exchange between Water and Atmosphere in Models of Thermal Pollution in Rivers

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive

Diffusion of bedload particles in open-channel flows : distribution of travel times and second-order statistics of particle trajectories

Acknowledgments The authors are grateful to the reviewers for thorough reviews, constructive comments and useful suggestions that have been gratefully incorporated in the final manuscript. Funding for this research was provided in part by the Institute of Geophysics of the Polish Academy of Sciences through the Project for Young Scientists No. 16/IGF PAN/2011/Mł ‘‘Dynamics and topography of riverbed forms: an analysis of experimental data and modelling of sediment transport in the light of Einstein’s theory’’, by Ministry of Sciences and Higher Education within statutory activities No. 3841/E-41/S/2015, and by EPSRC, UK (EP/G056404/1) within the project ‘‘High-resolution numerical and experimental studies of turbulence-induced sediment erosion and near-bed transport.’’ Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.Peer reviewedPublisher PD

Numerical Modeling of Transport of Thermal Pollution in a River – Case Study

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Projekt: Uniwersytet PAN

Among the scientific institutions in Poland, the institutes of the Polish Academy of Sciences possess top-ranking research potential. In the years 2013-2016, for instance, 19.7% of all research articles published in the most prestigious research journals for each particular field (the top 10% of the list of journals for each field, ranked by impact factor) by authors affiliated with Polish institutions came from the institutes of the Polish Academy of Sciences – this is far the best such percentage among all Polish academic institutions. The staff members at the PAS institutes are engaged not only in research, but also in teaching: as of 31 December 2016, there were 1607 individuals in regular PhD programs at the PAS institutes. Moreover, the degree of internationalization (8%) of these programs at the PAS institutes is the highest among all Polish higher-education institutions. These and other factors are seen as providing justification for the plan to pull together the potential of the PAS institutes in order to create a new higher-education institution, to be called the University of the Polish Academy of Sciences (UPAS), meant to become Poland’s first-ever research university. Plans call for UPAS to ultimately have a total of 2500 students studying in its programs, predominantly third-cycle (PhD-level) programs. Such a number will enable each student to be ensured individual supervision by top-notch researchers. It will also allow innovative teaching programs to be developed and tested in keeping with the new trends of the Internet era and e-learning, through online course offerings and through inter- and cross-disciplinary studies. Under this plan, UPAS stands a real chance of becoming a proud showpiece of Polish science and higher education: holding open, international competitions for various long-term positions as visiting professors, post-doc researchers, and PhD candidates will help further bolster the degree of internationalization among both the staff and students of UPAS, bringing it up to the level that characterizes the world’s best higher-education institutions. Given the size of Poland’s budget for science and higher education, attaining such a degree of internationalization in the near future will only be financially feasible for a university as small as UPAS. The above measures will also have a quality-boosting impact on the PAS institutes themselves, significantly improving their level. After several years, UPAS will stand a real chance of attaining very good standing in international rankings of the world’s higher education institutions, among the top 200 or even top 100 in the world. We should stress clearly: for this to happen, the funding for research at PAS institutes will need to be maintained on at least the same level as at present, the network of PAS institutes will need to be made more flexible, incorporating mechanisms generating significant synergy between the institutes (with UPAS as the common objective), and the project will need to be supported by a long-term program of internationalization of staff and students.Instytuty Polskiej Akademii Nauk mają wśród polskich instytucji naukowych czołowy potencjał merytoryczny. W instytutach PAN w latach 2013-2016 powstało 19,7% prac afiliowanych w polskich instytucjach i umieszczonych w najbardziej prestiżowych pismach naukowych danych dziedzin (górne 10% z list pism danej dziedziny nauki uszeregowanych według rosnącego współczynnika wpływu, IF). Jest to najlepszy wynik wśród polskich instytucji akademickich. Kadra instytutów PAN zajmuje się nie tylko badaniami, ale też dydaktyką; 1607 osób (stan na 31 grudnia 2016) było na stacjonarnych studiach doktoranckich w Instytutach PAN. Stopień umiędzynarodowienia studiów w PAN (8%) jest największy wśród polskich uczelni. W związku z tym uzasadnione wydaje się powołanie Uniwersytetu PAN (UPAN), który mógłby stać się pierwszą w Polsce uczelnią badawczą. Planuje się, że docelowo kształciłoby się na nim 2,5 tys. osób, w przeważającej części studentek i studentów III stopnia. Taka liczba pozwoli na zagwarantowanie indywidualnej merytorycznej opieki każdemu studentowi, a także na wprowadzenie i przetestowanie nowatorskich programów dydaktycznych, właściwych erze Internetu i e-learningu, prowadzenia studiów online poprzez courser, studiów inter- i crossdyscyplinarnych. UPAN ma realne szanse stać się wizytówką polskiej nauki i szkolnictwa wyższego, gdyż otwarte, międzynarodowe wieloletnie programy konkursowe na pozycje: wizytujących profesorów, stażystów podoktorskich i doktorantów mogą podnieść umiędzynarodowienie zarówno kadry, jak i studentów UPAN do poziomu właściwego najlepszym uczelniom świata. Z uwagi na wielkość naszego budżetu nauki i szkolnictwa wyższego osiągnięcie takiego umiędzynarodowienia jest finansowo realne w najbliższym czasie tylko dla uczelni tak małej jak UPAN. Opisane działania będą projakościowe także dla samych instytutów PAN i istotnie podniosą ich poziom merytoryczny. Po kilku latach UPAN ma realne szanse na uplasowanie się w międzynarodowych rankingach na bardzo dobrych pozycjach, w pierwszej dwusetce, a nawet w pierwszej setce najlepszych światowych uczelni. Należy podkreślić, że warunkiem tego jest zapewnienie finansowania badań w instytutach PAN na co najmniej takim jak obecnie poziomie, uelastycznienie ich sieci, wytworzenie mechanizmów synergii pomiędzy instytutami (wspólny cel – UPAN) oraz wsparcie tego projektu długoletnim programem umiędzynarodowienia kadry i studentów

Water-Worked Bedload: Hydrodynamics and Mass Transport

Turbulent flow over a natural streambed is complex in nature, especially in the near-bed flow zone, because a natural water-worked bed exhibits a spatially complex, three-dimensional structure [...

Impact of Unsteady Flow Events on Bedload Transport: A Review of Laboratory Experiments

Recent advances in understanding bedload transport under unsteady flow conditions are presented, with a particular emphasis on laboratory experiments. The contribution of laboratory studies to the explanation of key processes of sediment transport observed in alluvial rivers, ephemeral streams, and river reaches below a dam is demonstrated, primarily focusing on bedload transport in gravel-bed streams. The state of current knowledge on the impact of flow properties (unsteady flow hydrograph shape and duration, flood cycles) and sediment attributes (bed structure, sediment availability, bed composition) on bedload are discussed, along with unsteady flow dynamics of the water-sediment system. Experiments published in recent years are summarized, the main findings are presented, and future directions of research are suggested

Assessment of Environmental Water Requirement Allocation in Anthropogenic Rivers with a Hydropower Dam Using Hydrologically Based Methods—Case Study

Anthropogenic activities such as damming have caused an alteration in the natural flow regime in many rivers around the world. In this study, the role of constructing a hydroelectric dam on the natural flow regime of the Kor River, Iran, is investigated. Nine different methods, which fall into the category of hydrological methods, were used to determine the environmental water requirement (EWR) of the Kor River. In addition, two indices are introduced to evaluate the environmental flow allocation in anthropogenic rivers. The results show that although the supply of environmental flow in some months is in relatively acceptable conditions on average, there is a deficiency in the allocation of EWR in the range of 1.92–30.2% in the spawning period of the dominant fish species. The proposed indicators can provide a general picture of the status of environmental flow allocation in rivers where little ecological data is available and the hydrological regime has changed due to human activities, particularly in rivers with hydropower plants. Moreover, after the construction of the dam, no major floods have occurred in the river, which has led to the loss of the morpho-ecological balance in the river and disruption of the natural state of habitats. Therefore, the negative impact of dam construction on the environmental conditions of the river should be considered in the active management of the dam outlets

Assessment of Environmental Water Requirement Allocation in Anthropogenic Rivers with a Hydropower Dam Using Hydrologically Based Methods—Case Study

Anthropogenic activities such as damming have caused an alteration in the natural flow regime in many rivers around the world. In this study, the role of constructing a hydroelectric dam on the natural flow regime of the Kor River, Iran, is investigated. Nine different methods, which fall into the category of hydrological methods, were used to determine the environmental water requirement (EWR) of the Kor River. In addition, two indices are introduced to evaluate the environmental flow allocation in anthropogenic rivers. The results show that although the supply of environmental flow in some months is in relatively acceptable conditions on average, there is a deficiency in the allocation of EWR in the range of 1.92–30.2% in the spawning period of the dominant fish species. The proposed indicators can provide a general picture of the status of environmental flow allocation in rivers where little ecological data is available and the hydrological regime has changed due to human activities, particularly in rivers with hydropower plants. Moreover, after the construction of the dam, no major floods have occurred in the river, which has led to the loss of the morpho-ecological balance in the river and disruption of the natural state of habitats. Therefore, the negative impact of dam construction on the environmental conditions of the river should be considered in the active management of the dam outlets