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Academic literature on the topic 'River processes'

Author: Grafiati

Published: 10 March 2023

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Journal articles on the topic "River processes"

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Vandenberghe, Jef, and Ming-ko Woo. "Modern and ancient periglacial river types." Progress in Physical Geography: Earth and Environment 26, no. 4 (2002): 479–506. http://dx.doi.org/10.1191/0309133302pp349ra.

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Climate has been proposed conventionally as the primary factor that determines periglacial river activity (aggradation) and pattern (braided). This concept does not explain the rich diversity in river patterns and morphological processes in both the present and past periglacial environments: besides braided rivers and sandur, meandering, anabranching, transitional and deltaic rivers also occur. A first attempt is made to combine past and present periglacial river types with regard to their morphology, processes and environments. The processes that control river energy and morphology are discussed especially for periglacial conditions. This approach permits an assessment of the responses of periglacial rivers to climatic conditions and the modulation of the responses due to changes in the basin properties. Examples drawn from palaeo- and present-day periglacial rivers and environments demonstrate that there is no unique type of periglacial river but rather an azonal fluvial system with a number of periglacial variants.

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Delina, Aija, Alise Babre, Konrads Popovs, Juris Sennikovs, and Baiba Grinberga. "Effects of karst processes on surface water and groundwater hydrology at Skaistkalne Vicinity, Latvia." Hydrology Research 43, no. 4 (2012): 445–59. http://dx.doi.org/10.2166/nh.2012.123.

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The Skaistkalne area in Latvia is one of the places where karst processes in gypsum strata occurs. The Iecava and Memele rivers border the area with extensive surface karst features such as sinkholes and karst lakes. Earlier investigations suggested a hydraulic connection between the Iecava and Memele rivers exists via the karst conduits due to the water level (WL) difference in the rivers. A set of methods was performed to study the possible connection: dye tracer was applied in the Iecava river and its occurrence was visually observed at the karst lakes and Memele river; the current velocity was measured and discharge of rivers calculated at several profiles; surface water and groundwater composition was studied involving in situ measurements of water pH and electrical conductivity, water sampling and chemical analysis of the water samples on the content of sulphates, calcium and magnesium ions. A numerical finite element 3D groundwater flow model was developed to assess the impact of WL changes in rivers to groundwater flow. The study showed that there is direct hydraulic connection between the rivers – water from the Iecava river flows to the Memele river. The groundwater discharge to the Memele river varies seasonally, and more intensive groundwater discharge is observed during the high season.

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Lefebvre, Mario, and Fatima Bensalma. "An Application of Filtered Renewal Processes in Hydrology." International Journal of Engineering Mathematics 2014 (May 5, 2014): 1–9. http://dx.doi.org/10.1155/2014/593243.

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Filtered renewal processes are used to forecast daily river flows. For these processes, contrary to filtered Poisson processes, the time between consecutive events is not necessarily exponentially distributed, which is more realistic. The model is applied to obtain one- and two-day-ahead forecasts of the flows of the Delaware and Hudson Rivers, both located in the United States. Better results are obtained than with filtered Poisson processes, which are often used to model river flows.

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Yakhno, Oleg, Ihor Hnativ, and Roman Hnativ. "Influence of cavitation processes on river water purification of mountain streams." Mechanics and Advanced Technologies 6, no. 1 (2022): 62–69. http://dx.doi.org/10.20535/2521-1943.2022.6.1.254613.

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Problems: The article considers the study of the influence of cavitation phenomena in hydrodynamically active areas of mountain rivers on the processes of natural self-purification of water. The paper considers the experimental results of determining the change in seasonal indicators of the hydrochemical composition of surface waters in the Stryi river basin. Objective: to determine the impact of hydrodynamically active areas (HAA) of mountain rivers on the processes of natural self-purification and to develop methods of laboratory modeling of these areas to determine the hydrochemical parameters of river waters. Methods of implementation: Research of ecological and hydrochemical factors of chemical composition of natural waters of the Stryi river basin combines basin and landscape-geochemical approaches, which allows to integrate various natural and anthropogenic influences, to identify the most important parameters for their detailed analysis. The combination of these approaches made it possible to improve the method of ecological analysis of the area of the Stryi river basin, which allows to spatially differentiate and hydrochemically integrate the factors of formation of the chemical composition of natural waters. Results: It is stated that microbiological safety of water is a special problem, because even water from underground sources may contain single cells of pathogenic microorganisms, but the main threat is water re-contaminated with microbes in case of leaks in the water supply network. Conclusions: Analysis of the results of studies of the impact of self-cleaning processes in the river Stryi on the quality of water intake in Stryi showed that there are currently no negative effects of river waters of the river Stryi on groundwater deposits. The quality of river water is satisfactory for its use in domestic and drinking water supply and for recreational purposes.

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Osterkamp, W. R. "Fluvial Processes in River Engineering." Eos, Transactions American Geophysical Union 70, no. 4 (1989): 51. http://dx.doi.org/10.1029/89eo00033.

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Nafziger, Jennifer, Yuntong She, and Faye Hicks. "Dynamic river ice processes in a river delta network." Cold Regions Science and Technology 158 (February 2019): 275–87. http://dx.doi.org/10.1016/j.coldregions.2018.09.005.

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Timuhins, Andrejs, Valērijs Rodinovs, and Māris Kļaviņš. "Wavelet analysis of the Baltic region river runoff longh-term trends and fluctuations." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 64, no. 5-6 (2010): 229–35. http://dx.doi.org/10.2478/v10046-011-0009-1.

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Wavelet analysis of the Baltic region river runoff longh-term trends and fluctuations The study of changes in river discharge and flood regime can provide important information on climate change and its impacts. Wavelet analysis offers new possibilities to study changes of river discharge patterns in regard to periodical processes on a background of climate change. In this study wavelet analysis was used to study long-term changes of river discharge in the Baltic region. Periodic oscillations of discharge intensity, and low- and high-water flow years are common for the major rivers in the Eastern Baltic region. Main frequencies of river discharge were estimated to be 14, 28, 37 years for the studied rivers. Wavelet analysis allowed to identify similarities between the river discharge regime, and thus, the factors influencing it. Years of maximal and minimal discharges for major rivers were identified and the impact of large-scale atmospheric circulation processes on the river discharge was studied.

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Wohl, Ellen. "Geomorphic context in rivers." Progress in Physical Geography: Earth and Environment 42, no. 6 (2018): 841–57. http://dx.doi.org/10.1177/0309133318776488.

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Geomorphic context refers to the geomorphic setting of a river reach, which is defined as a length of river with consistent valley and channel geometry. Context includes spatial dimensions of geometry, location within a drainage basin, and location within a global context. Context also includes temporal dimensions of the frequency and duration of specific processes influencing the river reach and the historical sequence of natural and human-induced processes that continue to influence process and form in the river reach. These spatial and temporal characteristics interact to create a geomorphic context that governs the contemporary form of the river corridor, the rates and processes by which diverse materials move through the corridor, and the adjustments of form and process in response to disturbances. Context matters for both basic understanding and effective management of river corridors. Examples of widely used formal articulations of geomorphic context include a bedform-based classification of mountain streams, geomorphic process domains, and river styles. Each has been applied to understanding and predicting longitudinal variations in stream power, sediment budgets, habitat and biotic communities, resilience to disturbance, and other characteristics of rivers. The three Cs of rivers—complexity (or spatial heterogeneity), connectivity, and context—provide a conceptual framework for river research and management.

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Li, Pushuang, Dan Li, Xiaoqing Sun, Zhaosheng Chu, Ting Xia, and Binghui Zheng. "Application of Ecological Restoration Technologies for the Improvement of Biodiversity and Ecosystem in the River." Water 14, no. 9 (2022): 1402. http://dx.doi.org/10.3390/w14091402.

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With global warming, urbanization, and the intensification of human activities, great pressures on river ecosystems have caused ecosystem degradation, the decline in habitats and biodiversity, and the loss of function. Ecological restoration technologies (ERTs) in rivers are effective measures for improving habitat and biodiversity, which has the advantage of recovering ecosystems and biodiversity and promoting the formation of healthy rivers. Several applications of ERTs, including ecological water transfer, fish passage construction, dam removal/retrofit, channel reconfiguration, river geomorphological restoration, natural shoreline restoration, floodplain reconnection, revegetation, etc., are summarized. The classifications of ERTs are highlighted, aiming to distinguish the difference and relationship between structure and the processes of hydrology, physics, geography, and biology. The pros and cons of these technologies are discussed to identify the applicability and limitations on the river ecosystem. In the dynamic processes in the river, these interact with each other to keep ecosystem balance. ERTs are more helpful in promoting the restoration of the natural function of the river, which contribute to the management of river ecological health. Some proposals on river management are suggested. Establishing a unified river health evaluation system will help promote positive feedback on rivers and the further development of ERTs.

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Zhou, Siping, J. A. McCorquodale, and J. Biberhofer. "Modelling of pollutant mixing in the St. Lawrence River." Canadian Journal of Civil Engineering 22, no. 5 (1995): 1041–45. http://dx.doi.org/10.1139/l95-118.

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Many of Canada's large rivers, such as the connecting channels of the Great Lakes, receive contaminant loads from industrial, municipal, and tributary sources. These contaminants experience two general types of mixing, outlet-dominated mixing processes (near field) and river-dominated mixing processes (far field). This note is concerned with the numerical modelling of the far field processes by a fully elliptic form of the two-dimensional depth-averaged river model proposed by Rodi et al. Many of the popular hydrodynamics codes experience numerical diffusion which far exceeds the real turbulent diffusion; a new method known as the semi-implicit skewed upwind method is introduced to minimize the numerical dispersion for rivers with highly nonlinear alignment. The new model is verified by comparison with the field data obtained from a dye study in the St. Lawrence River. Key words: pollutant transport, river mixing, far field model, numerical diffusion.

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Dissertations / Theses on the topic "River processes"

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Tassi, Pablo. "Numerical modelling of river processes: flow and river bed deformation." Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/57998.

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Pernik, Maribeth. "Mixing processes in a river-floodplain system." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/19514.

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Dong, Na. "Border ice processes on the Saint Lawrence River." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28450/28450.pdf.

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Border ice is one of many ice freeze-up processes, but it is discussed only to a limited extent in the literature. Border ice formation can be a precursor for ice jam formation that may restrict navigation and lead to flooding. This master’s thesis is mainly devoted to the research on the border ice on the Saint Lawrence River from Montréal to Québec City. This reach stays artificially open all winter because commercial ships are continuously preventing a full ice cover to form. The traffic also limits the extent of border ice. This study provides key information on ice formation and decay. Through analysis of Environment Canada’s historical data (ice charts from 2004 to 2009), the areal coverage of border ice is analyzed during freeze-up, winter and breakup periods. The historical information of ice coverage is collected in order to find out the factors which influence its formation and its spatial limits. Border ice growth and decay rates are also discussed. The thesis shows that border ice coverage has three stages including the rapid growth period at the beginning of the winter, the relatively stable period in the mid-winter and the breakup period as March progresses. During the mid-winter period, the border ice coverage sometimes drops sharply if the air temperature rises above 0 °C and/or if there is some rain. It was also found that the maximum border ice spatial limits are quite similar over the five winter seasons. Based on the analysis of the ice charts, a number of empirical laws regarding the formation and decay of border ice are proposed. Along the river flowing direction, the border ice is formed easily when there are obstacles particularly at the downstream end. The obstacles could include river bends, ice booms, shoals, artificial islands, bridge piers and so on. Thus, the obstacle influences the flow velocity, which is an important factor for ice formation and also provides an object against which the ice can become fast and initiate its formation. On average, border ice reaches 20% of its maximum coverage when the accumulated freezing degree days (AFDD) reaches 124 °C-D. This is followed by a rapid growth period that ends when the ice cover reaches about 80% of its maximum cover corresponding to AFDD equal to 247 °C-D. Border ice coverage usually reaches the maximum value when the average AFDD is 551 °C-D corresponding to the end of January. The winter period is characterised by a stable ice cover (>90% of max) upstream of Trois-Rivières except in the event of a mid-winter thaw. Downstream of Trois-Rivières there is no stable period as the decay begins very soon after the ice reaches its maximum value. Breakup is a gradual process that normally begins on about Feb. 15th downstream of Trois- Rivières and about March 1st upstream. Most ice has normally gone by March 31st. Moreover, the river flow velocity, river depth and Froude number along the limits of border ice once it reaches its maximal areal coverage are evaluated and analyzed. The flow velocity is almost always less than 1.0 m/s; the maximum Froude number is normally 0.1 at Lake Saint-Pierre and 0.2 in the Montréal to Sorel reach; river depth at the ice edge can vary widely. Through numerical modelling, it was found that border ice increased the current velocity by 0.1 m/s in the Lake Saint-Pierre reach and raised water levels by 14 cm in the Montréal to Sorel reach.<br>La glace de rive est un des nombreux processus de formation des couverts de glace sur les rivières. Cependant peu d’articles dans la littérature traitent de ce sujet malgré que la formation de la glace de rive peut-être un précurseur de l’apparition d’embâcles qui peuvent entrainer des inondations. Ce mémoire de Maitrise porte sur l’étude de la glace de rive le long de la portion du fleuve Saint-Laurent allant de Montréal à Québec. Du fait qu’il y a de la navigation commerciale toute l’année, le fleuve reste ouvert (libre d’un couvert de glace entier) artificiellement pendant tout l’hiver. Ce trafic limite aussi l’extension de la glace de rive. Cette étude fournit des informations clés sur la formation et la désagrégation de la glace de rive. À partir des données historiques d’Environnement Canada (cartes des glaces de 2004 à 2009), la répartition superficielle de la glace de rive est analysée pour les périodes de formation, de stabilité et de rupture de la glace. Les informations historiques sur les couvertures de glace sont collectées afin de déterminer les paramètres qui influencent la formation et les limites spatiales de ce type de glace. Les taux de croissance et de décomposition de la glace de rive sont aussi abordés. Il est montré que l’évolution de la structure propre à la couverture de la glace de rive se fait en trois étapes. Une période de formation rapide (début hiver), suivie d’une période stable (milieu d’hiver) et enfin une période de rupture (pendant le moi de mars). Pendant la période stable, la glace de rive se rompt partiellement parfois lorsque la température de l’air monte au dessus de zéro °C et surtout lorsque le redoux est accompagné de pluie. Il a été trouvé aussi que les limites spatiales maximales des glaces de rive sont très semblables sur 5 hivers de la période d’étude. À partir de l’analyse des cartes des glaces, un certain nombre de relations empiriques sont proposées. Ces relations caractérisent la formation et la désagrégation des glaces de rive. Le long de la direction de l’écoulement la glace de rive est formée facilement en présence d’obstacles, et particulièrement lorsqu’elles sont à l’extrémité aval. Parmi ces obstacles on peut citer les méandres de rivière, les bancs, les estacades, les iles artificielles, les piliers de ponts. Ainsi, les obstacles influencent la vitesse d’écoulement qui est un paramètre important dans la formation de la glace et peut aussi effectuer un apport d’objets sur lesquels la glace peut s’attacher et initier son accroissement. En moyenne la glace de rive atteint 20% de sa couverture maximale lorsque son le nombre de degrés jours accumulés (DJA) atteint 124 °C-j. Ceci est suivi d’une période d’accroissement rapide qui prend fin lorsque la couverture de glace atteint 80% de son maximum qui correspond à un DJA de 247 °C-j. La couverture de glace de rive atteint son maximum lorsque le DJA atteint 551 °C-j; ce qui correspond normalement à la période de fin janvier. La période d’hiver est caractérisée par une couverture de glace stable (supérieure à 90% de son maximum) en amont de Trois-Rivières, sauf pendant les périodes de dégel mi hivernales. À l’aval de Trois-Rivières, il n’y a pas de période stable, vu que la désagrégation commence très tôt après que la glace ait cru à son étendu maximal. La rupture est un processus graduel qui normalement commence vers le 15 février en aval de Trois-Rivières et vers le premier mars en amont. La grande majorité de la glace disparait généralement avant le 31 mars. Par ailleurs, la vitesse d’écoulement de la rivière, ainsi que sa profondeur et son nombre de Froude le long des limites de la glace de rive sont évalués. Ceci dans la condition où la glace de rive a atteint sa répartition superficielle maximale. La vitesse est presque toujours inférieure à 1 m/s, le nombre de Froude maximal est normalement de 0,1 au dans le Lac St Pierre et de 0,2 sur le tronçon Montréal-Sorel. La profondeur de la rivière à la limite de la glace peut varier largement. À partir d’une modélisation numérique, il a été calculé que la glace de rive cause une augmentation de la vitesse de 0,1 m/s dans le chenal maritime du Lac St Pierre et du niveau d’eau de 14 cm dans le tronçon Montréal-Sorel.

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Trieu, Hai Q. "Bank erosion processes along the lower Mekong River." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/340011/.

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This project conducts an analysis of bank erosion processes on a large, monsoonaffected river, the Lower Mekong River in Laos. The methodological approach taken was to build integrated models of bank erosion processes at three study sites on the Lower Mekong River in Laos (Friendship Bridge, Ang Nyay and Pakse) to simulate processes of (i) groundwater seepage and pore water pressure evolution, (ii) the effect of this on mass-wasting (using the Geo-slope model) and, (iii) fluvial erosion (using a model adapted from Kean and Smith, 2006ab). In all cases the models were parameterised using measured bank geotechnical properties. Across the study sites, a total of 42 simulations were undertaken to represent a wide range of observed flow events. Specifically, 14 selected flow hydrographs (comprising three types: single peak, multiple peak and rapid fall) were evaluated at each of the study sites, such that the influence on bank erosion of the hydrological properties of different monsoon floods could be evaluated. The main findings indicate that although the Mekong is a big river, its dominant bank erosion process is one of slow, gradual, fluvial erosion. This research forms a partial contribution to understanding bank erosion processes operating in the Mekong. It was found that bank stability on the Mekong responses to variations in flood magnitude in ways that are similar to other rivers located within humid temperate areas. However, the Mekong has had the greater stability than these rivers due to its greater bank heights and more consolidated bank materials.

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Headey, Jonathan Mark. "Modelling of river corridors : modelling urban particulate transport processes." Thesis, University of Birmingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289714.

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Markham, Andrew James. "Flow and sediment processes in gravel-bed river bends." Thesis, Queen Mary, University of London, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308275.

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Phillips, Zachary Rockford. "Holocene Postglacial Fluvial Processes and Landforms in Low Relief Landscapes." Diss., North Dakota State University, 2020. https://hdl.handle.net/10365/32036.

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Postglacial rivers are part of the relatively young low-relief landscape system left behind by glaciers. Over time, postglacial rivers are susceptible to both minor and major channel planform changes as the Earth and its newly exposed rivers adjust to new isostatic and geomorphic equilibriums. Those planform changes result in topographic features that are well preserved among the largely unaltered landscape and offer opportunities to learn about the processes that create them. This work focuses on those minor and major planform changes and the resulting landforms, with a focus on processes effecting the glaciolacustrine Red River Valley. Here, three studies were conducted, two regarding minor planform changes and one focusing on major planform changes. Studies included in this work regard 1) the spatial distribution of meander cutoffs and meander cutoff relief on the Red River, 2), avulsion timing and length resulting from isostatic tilting and 3) mobile river ice and bank interaction frequency, locations, and erosion in meandering rivers. Results show that rivers develop meander cutoffs that faster in areas where geologic materials are more easily eroded and their relief shows a positive relationship with the rate of river incision. Major channel path changes (avulsions) in the presence of isostatic tilting were found to be most frequent soon after river establishment while rates of isostatic rebound are high enough to outpace channel incision. River ice was found to most frequently interact with the outer banks of channels with long, tight bends and high sinuosity, potentially contributing to the meandering process. From these results it can be interpreted that postglacial rivers were highly dynamic early in their history and have stabilized over time, with most of the changes occurring in areas with more erodible alluvium. Presently, rivers undergo most of their changes during the spring thaw when mobile river ice is impacting the banks, with sinuous river reaches impacted most frequently by mobile river ice.<br>North Dakota Water Recourses Research Institute (ND WRRI) Fellowship Program

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Allread, Tyler M. "Channel Narrowing of the Green River near Green River, Utah: History, Rates, and Processes of Narrowing." DigitalCommons@USU, 1997. https://digitalcommons.usu.edu/etd/6525.

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Previous scientific research has documented channel narrowing on the Green River near Green River, Utah, but the exact timing, rates, and causal mechanisms of that narrowing have been the source of disagreement in the scientific literature. This thesis demonstrates that the Green River has narrowed in two separate periods during the last 100 years. The narrowing is driven primarily by changes in the hydrologic regime and not by the invasion of saltcedar. The channel narrowed between 1930 and 1938, when a shift from wetter than normal conditions to a period of draught led to a reduction in river discharge. Channel width then remained relatively stable until construction of Flaming Gorge Dam in 1962, despite the presence of saltcedar. Narrowing has occurred since dam construction. Detailed analysis of the formation of an inset floodplain deposit indicates that it formed by a process of vertical accretion, during incremental events. Inset bank deposits within the study area are composed primarily of particles smaller than 0.125 mm. Measurement of suspended sand distribution within the water column shows that particles of this size are carried in suspension by the 2-yr flood. Continued vertical accretion over time elevated the floodplain surface until inundation rarely occurs.

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Moretto, J. "Linking River Channel Forms and Processes in Gravel Bed Rivers: Time, Space, Remote Sensing and Uncertainty." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423802.

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The “modern” fluvial morphology, is the results of a series of events characterized by both natural and human dynamics. Recognizing the process responsible for particular morphology is not a simple analysis, it can be more difficult or impossible if the data collected have too low resolution or too high uncertainty in relation to the spatial and temporal scale assessed. This work aims to analyse and optimize different data and collection methods, derived from different time, space and resolution scales, with a good equilibrium between time-consuming and results at low uncertainty. Different gravel bed reaches were analysed as study area: Brenta, Piave, Tagliamento River (Italy) and Feshie River (Scotland). Three geomorphic analyses were applied at different spatial and temporal scale. A planimetric approach through a multitemporal analysis over the last 30 years on the Brenta River. A volumetric approach through a revised colour bathymetry; hybrid digital terrain models (HDTM) building and comparison of different digital elevation models (DoD) was used to study relevant flood events that occurred in the North-East Italian rivers (Brenta, Piave and Tagliamento). A highly detailed resolution, derived from Terrestrial Laser Scanner (TLS) to study its uncertainty, was applied on the Feshie River and to some laboratory experiments. Results show that on the Brenta River, lower active channel narrowing happened from 1981 to 1990 even if relatively important floods occurred. The active channel was likely at its minimum extent due to still relevant human impacts. Partial recovery of the active channel width was detected from 1990 to 2011 due to less gravel mining and human pressure. The proposed methodology for producing high-resolution Digital Terrain Models (DTMs) in wet areas has an uncertainty comparable to LiDAR (Light Detection And Ranging) data in dry areas. The bathymetric model calibration only requires a dGPS survey in the wet areas contemporary to aerial images acquisition. Detailed and automatic erosion - deposition analyses starting from a DoD are possible thanks to the “principal erosion deposition analyser” script developed. Density, angle of incidence and laser intensity seem to be the most uncertain influencing factors in DTMs building from TLS point clouds. A new TLS filter developed provides semi-automatic point cloud classifications to filter the vegetation. The geomorphic approaches presented provide an adequate topographical description of the rivers to explore channel adjustments due to natural and human causes at different spatial and temporal scales. The study represents a valuable tool for any fluvial engineering, river topography description, river management, ecology and restoration purposes.<br>La “moderna” morfologia fluviale, è il risultato di una serie di eventi caratterizzati da differenti dinamiche, naturali ed antropiche. Riconoscere i processi responsabili di una particolare morfologia, può divenire complesso se i dati disponibili presentano bassi livelli di risoluzione o eccessiva incertezza in funzione della scala temporale e spaziale analizzata. Questo lavoro si è focalizzato ad analizzare ed ottimizzare differenti tipi di dati e metodologie di rilievo in differenti tratti fluviali a fondo ghiaioso dell’Italia Nord-Orientale e della Scozia: Fiume Brenta, Piave e Tagliamento (Italia) e Fiume Feshie (Scozia). Tre differenti metodologie geomorfometriche sono state applicate a diverse scale spaziali e temporali. Un approccio planimetrico attraverso un’analisi multitemporale degl’ultimi 30 anni in un tratto del Fiume Brenta. Un approccio volumetrico attraverso una rivisitata applicazione di batimetria da colore, con costruzione di modelli digitali del terreno “ibridi” (HDTM) e comparazione di modelli di elevazione (DoD) per lo studio di un intenso evento di piena, avvenuto nei fiumi italiani considerati. Rilievi in laboratorio e nel Fiume Feshie ad alta risoluzione, tramite laser scanner terrestre (TLS), sono stati eseguiti per studiarne l’incertezza ed individuare metodologie di classificazione spaziale delle nuvole di punti. I risultati, mostrano che dal 1981 al 1990 nel Fiume Brenta persiste ancora un processo di restringimento dell’alveo attivo. L’impatto umano è ancora presente. L’alveo attivo presenta la sua minima estensione. Dal 1990 al 2011, sembra che un parziale recupero della larghezza dell’alveo attivo sia in atto. Minor pressione da estrazione di ghiaia e da impatto umano, caratterizzano questo periodo. La metodologia proposta per produrre DTM ad alta risoluzione in presenza di aree bagnate ha dimostrato un’incertezza comparabile con il LiDAR nelle aree secche. La calibrazione dei modelli batimetrici, richiede un rilievo dGPS nelle aree bagnate in “contemporaneo” con l’acquisizione delle foto aeree. Grazie allo script sviluppato (PrEDA), sono possibili più dettagliate e automatiche analisi dell’erosione e della deposizione. Densità, angolo di incidenza ed intensità laser sembrano essere i fattori che maggiormente influenzano l’incertezza nella realizzazione di modelli di elevazione da TLS. Il filtro sviluppato per nuvole TLS è in grado di fornire semi-automatici filtraggi della vegetazione. Gli approcci geomorfometrici presentati, forniscono adeguate descrizioni topografiche dei sistemi fluviali; utili ad esplorare aggiustamenti dei canali dovuti a cause naturali o antropiche in differenti scale spaziali e temporali. Lo studio proposto, può rappresentare un valido supporto alla topografia in ambito fluviale, alla progettazione di interventi di ingegneria fluviale, ad una adeguata gestione fluviale, considerando aspetti ecologici e di riqualificazione fluviale.

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Ansari, Saber. "Automated Monitoring of River Ice Processes from Shore-based Imagery." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35180.

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Ice plays an important role in hydraulic processes of rivers in cold regions such as Canada. The formation, progression, recession and breakup of river ice cover known as river ice processes affect river hydraulics, sediment transport characteristics as well as river morphology. Ice jamming and break up are responsible of winter flash floods, river bed modification and bank scour. River ice cover monitoring using terrestrial images from cameras installed on the shores can help monitor and understand river ice processes. In this study, the benefits of terrestrial monitoring of river ice using a camera installed on the shore are evaluated. A time-lapse camera system was installed during three consecutive winters at two locations on the shores of the Lower Nelson River, in Northern Manitoba and programmed to take an image of the river ice cover approximatively every hour. An image analysis algorithm was then developed to automatically extract quantitative characteristics of the river ice cover from the captured images. The developed algorithm consists of four main steps: preprocessing, image registration, georectification and river ice detection. The contributions of this thesis include the development of a novel approach for performing georectification while accounting for a fluctuating water surface elevation, and the use of categorization approach and a locally adaptive image thresholding technique for target detection. The developed algorithm was able to detect and quantify important river ice cover characteristics such as the area covered by ice, border ice progression and ablation rate, and river ice break up processes with an acceptable accuracy.

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Books on the topic "River processes"

1

E, Darby Stephen, and Simon Andrew, eds. Incised river channels: Processes, forms, engineering, and management. J. Wiley, 1999.

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Fluvial processes in river engineering. Krieger Pub. Co., 1992.

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1942-, Tinkler K. J., and Wohl Ellen E. 1962-, eds. Rivers over rock: Fluvial processes in Bedrock channels. American Geophysical Union, 1998.

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River processes: An introduction to fluvial dynamics. Arnold, 2003.

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H, Chang Howard. Fluvial processes in river engineering. Wiley, 1988.

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Chang, Howard H. Fluvial processes in river engineering. Krieger Publishing Co., 1992.

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Toth, Peterpaul G. Vermilion River: Meandering and alluvial processes. Laurentian University, Department of Earth Sciences, 1991.

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Graf, William L. Fluvial processes in dryland rivers. Springer-Verlag, 1988.

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Lindenschmidt, Karl-Erich. River Ice Processes and Ice Flood Forecasting. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-28679-8.

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Brilly, Mitja, ed. Hydrological Processes of the Danube River Basin. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3423-6.

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Book chapters on the topic "River processes"

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Wang, Zhao-Yin, Joseph H. W. Lee, and Charles S. Melching. "Estuary Processes and Managment." In River Dynamics and Integrated River Management. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-25652-3_9.

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Shen, Hung Tao. "River Ice Processes." In Advances in Water Resources Management. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22924-9_9.

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Montgomery, David R., and John M. Buffington. "Channel Processes, Classification, and Response." In River Ecology and Management. Springer New York, 1998. http://dx.doi.org/10.1007/978-1-4612-1652-0_2.

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McClimans, T. A. "Estuarine Fronts and River Plumes." In Physical Processes in Estuaries. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73691-9_4.

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Edmonds, Douglas A., and Rebecca L. Caldwell. "River Delta Processes and Shapes." In Wetlands and Habitats. CRC Press, 2020. http://dx.doi.org/10.1201/9780429445507-9.

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Nestler, John M., Claudio Baigún, and Ian Maddock. "Achieving the aquatic ecosystem perspective: integrating interdisciplinary approaches to describe instream ecohydraulic processes." In River Science. John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118643525.ch5.

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Starosolszky, Odon. "Runoff and River Flow Measurements." In Land Surface Processes in Hydrology. Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60567-3_23.

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Brilly, Mitja. "Danube River Basin Coding." In Hydrological Processes of the Danube River Basin. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-3423-6_4.

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Dai, Zhijun. "Changjiang River Basin Overview." In Changjiang Riverine and Estuarine Hydro-morphodynamic Processes. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3771-1_1.

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Warmink, Jord J., and Martijn J. Booij. "Uncertainty Analysis in River Modelling." In Rivers – Physical, Fluvial and Environmental Processes. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17719-9_11.

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Conference papers on the topic "River processes"

1

Duarte, A. A. L. S., and J. M. P. Vieira. "Mitigation of estuarine eutrophication processes by controlling freshwater inflows." In RIVER BASIN MANAGEMENT 2009. WIT Press, 2009. http://dx.doi.org/10.2495/rm090311.

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"River flow and transport processes." In The International Conference On Fluvial Hydraulics (River Flow 2016). CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-9.

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Barros, M. L. C., P. C. C. Rosman, and J. C. F. Telles. "Water quality modelling in tidal wetlands considering flooding and drying processes." In RIVER BASIN MANAGEMENT 2013. WIT Press, 2013. http://dx.doi.org/10.2495/rbm130351.

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Astaraki, A., and F. Fallah. "Connecting river to sea by a 2-D mathematical model." In Coastal Processes 2011. WIT Press, 2011. http://dx.doi.org/10.2495/cp110191.

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Bernard, Jerry M., and Ronald W. Tuttle. "Stream Corridor Restoration: Principles, Processes, and Practices." In Wetlands Engineering and River Restoration Conference 1998. American Society of Civil Engineers, 1998. http://dx.doi.org/10.1061/40382(1998)55.

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Stankevičienė, Rasa, and Oksana Survilė. "Land Drainage Development Processes and Changes in the Context of Runoff Change in Northern Lithuania." In 11th International Conference “Environmental Engineering”. VGTU Technika, 2020. http://dx.doi.org/10.3846/enviro.2020.807.

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The impact of the drainage of excessively wet land on river runoff has so far been assessed differently and very carefully because of its complexity and diversity. The article analyses changes of drained land areas and runoff in the river basins of Mūša, Lėvuo Tatula and Nemunėlis. Wet land areas in the Mūša, Lėvuo and Nemunėlis rivers basins account for more than 70% from the total basins area and in the Tatula about 90%. Increase of drained land areas in the studied river basins has no significant influence on the change of river runoff. Studies have shown that the change in drained land areas did not affect the change in runoff height. Drainage does not have a significant effect on changes in the annual runoff distribution of the studied rivers.

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Holste, N. "Restoring natural river processes through channel realignment." In The International Conference On Fluvial Hydraulics (River Flow 2016). CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-324.

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Visescu, Erika. "RIVER BED PROCESSES MODELLING. STUDY CASE � MODELLING ON CRASNA RIVER SECTOR." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/31/s12.069.

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Nico, Peter, Dipankar Dwivedi, Patricia Fox, et al. "River Corridor Processes Across Scales in the East River of Colorado." In Goldschmidt2022. European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.12282.

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Niu, Xiaojing, Satoshi Ueyama, Shinji Sato, Yoshimitsu Tajima, and Haijiang Liu. "67. SEDIMENT MOVEMENT UNDER COMBINED WAVES, TIDE AND RIVER DISCHARGE IN A RIVER MOUTH." In Coastal Dynamics 2009 - Impacts of Human Activities on Dynamic Coastal Processes. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814282475_0069.

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Reports on the topic "River processes"

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Day, T. J. River Processes [Chapter 9: a Survey of Geomorphic Processes in Canada]. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/131644.

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Ashmore, P., and M. Church. The impact of climate change on rivers and river processes in Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2001. http://dx.doi.org/10.4095/211891.

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Conway, K. W., B. D. Bornhold, and J. V. Barrie. Surficial geology and sedimentary processes, Skeena River delta, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207870.

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Orebaugh, E. Adaptation of U(IV) reductant to Savannah River Plant Purex processes. Office of Scientific and Technical Information (OSTI), 1986. http://dx.doi.org/10.2172/5620962.

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Huntley, D., and A. Duk-Rodkin. Landslide processes in the south-central Mackenzie River valley region, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2006. http://dx.doi.org/10.4095/222392.

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Kostaschuk, R. A., and J. L. Luternauer. Sedimentary processes and their environmental significance: lower main channel, Fraser River estuary. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2004. http://dx.doi.org/10.4095/215799.

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Biedenharn, David S., and Maureen K. Corcoran. A Literature Review of Processes for Gravel Deposit Identification in the Lower Mississippi River. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada526307.

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Calloway, T. B. Foaming in Hanford River Protection Project Waste Treatment Plant LAW Evaporation Processes - FY01 Summary Report. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/799459.

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Bohrer, Gil, Kelly Wrighton, Jorge Villa, Garret Smith, Josue Rodriguez-Ramos, and James Stegen. Accounting for hydrological and microbial processes on greenhouse gas budgets from river systems. Final report. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1515174.

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Hayse, J. W., S. F. Daly, A. Tuthill, R. A. Valdez, B. Cowdell, and G. Burton. Effect of daily fluctuations from Flaming Gorge Dam in ice processes in the Green River. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/757502.

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