Готові списки джерел за темами / River bar

Добірка наукової літератури з теми "River bar"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "River bar"

1

Crosato, Alessandra, and Erik Mosselman. "An Integrated Review of River Bars for Engineering, Management and Transdisciplinary Research." Water 12, no. 2 (February 21, 2020): 596. http://dx.doi.org/10.3390/w12020596.

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Анотація:
River training and river restoration often imply modifying the patterns and dimensions of bars, channels, and pools. Research since the 1980s has greatly advanced and matured our knowledge on the formation and behavior of river bars, thanks to field work, laboratory experiments, theoretical analyses, and numerical modelling by several research groups. However, this knowledge is not easily accessible to design engineers, river managers, and ecologists who need to apply it. This is mainly due to confusing differences in terminology as well as to difficult mathematical theories. Moreover, existing scientific publications generally focus on specific aspects, so an overall review of the findings and their applications is still lacking. In many cases, the knowledge achieved so far would allow minimizing hard engineering interventions and thus obtaining more natural rivers. We present an integrated review of the major findings of river bar studies. Our aim is to provide accessible state-of-the-art knowledge for nature-based bar management and successful river training and river restoration. To this end we review the results from analytical, numerical, experimental, and field studies, explain the background of bar theories, and discuss applications in river engineering and river restoration.
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2

Jourdain, Camille, Nicolas Claude, Germain Antoine, Pablo Tassi, and Florian Cordier. "Influence of flood regime on riparian vegetation dynamics in rivers with alternate bars." E3S Web of Conferences 40 (2018): 02025. http://dx.doi.org/10.1051/e3sconf/20184002025.

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Анотація:
Throughout the 20th century, many rivers worldwide have undergone important riparian vegetation encroachment, which can be problematic in terms of flood risks and biodiversity. Nowadays, controlled floods is often considered as a management option in anthropized rivers, with the aim of limiting vegetation encroachment within river channels, as well as maintaining a diverse habitat by reactivating natural channel dynamics. In this context, this study aims at investigating the influence of different flood regimes on river bar vegetation development and dynamics, focussing on alternate bar systems which are typically found in embanked streams. This question has been addressed through two-dimensional bio-morphodynamic modeling of a simplified gravel bed river reach. Four hydrological scenarios with different flood peak discharges have been run for 50 years. For all scenarios, a steady increase in vegetation cover strongly impacts the evolution of bar morphology, until a relatively stable equilibrium is reached after one to three decades. Numerical results suggest that vegetation development on bars is associated to an increase in bar wavelength and a decrease in bar width. Higher peak flood discharges lead to narrower and longer bars, and a longer adjustment duration. When vegetation cover is fully developed, interannual flood variability seems crucial to maintain bedform and vegetation turnover.
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3

Pang, Xueqian, Cheng Xue, Yangping Liu, Li Yin, Yufeng Gao, and Yanshu Yin. "The Identification and Reservoir Architecture Characterization of Wandering Braided River in Nanpu 1-29 Area, Bohai Bay Basin." Geofluids 2022 (July 21, 2022): 1–17. http://dx.doi.org/10.1155/2022/4822714.

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Анотація:
Nanpu 1-29 Area of Jidong Oilfield in China is currently in the stage of high water cut and low recovery degree. The remaining oil development and adjustment are difficult because of the complex reservoir heterogeneity and the lack of analysis of the reservoir architecture due to the unclear river type. This study first used sedimentary background, granularity, core, and sand body distribution to determine the river type and believed it belongs to the wandering braided river. Combined with core and logging data, four types of sedimentary architectural elements were found in the study area, namely, channel bar, braided channel, floodplain, and basalt. Based on the scale measurement of many similar modern wandering braided rivers, core data, and empirical formulas, the scales of the braided rivers were determined. The quantitative relationships among the scale of the braided river, the channel bar, and the braided channel were established. With this constraint, the reservoir architecture was anatomized. The results showed two filling types of the braided channels, including sandy filling and muddy filling. The combination patterns of the channel bars and the braided channels could be divided into three types, namely, superimposed, standalone, and contact, and the contact type was the primary type. On the whole, it showed the geometric morphological characteristics of the flat top convex at the bottom of the channel bar and the flat bottom convex at the top of the braided river channel. A careful measure of the architectural element was executed. The length of the single braided flow belts was 365.16-1349.72 m, and the width was 270.57-1160.54 m. The channel bar’s length was distributed 158.89-318.32 m, and the width was distributed 75.97-116.41 m. The braided river’s width was distributed 16.81-180.05 m. The length and width ratio of the channel bar was concentrated between 2 and 4, which manifested wide bar and narrow river channel mode. Finally, the static distribution model and dynamic response curve were compared to verify the correctness of the reservoir architecture characteristics to guide the subsequent development of the oilfield.
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4

Wang, Jun, Shao Hua Li, Fu Lun Shi, and Xiao Ling Hu. "Development Mode of Delta Mouth Bar." Advanced Materials Research 807-809 (September 2013): 1620–23. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.1620.

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Анотація:
Es2 8th sand group in Shengtuo oilfield is a typical braided river delta front deposition. Through depositional physical simulation, the development mode of mouth bar and its main controlling factors were summarized. Physical model and experiment scheme were set up according to similarity criterion and the depositional background in research area. One provenance and three times simulation was designed to simulate three single layers within Es2 8th sand group respectively. Development mode of mouth bar was summarized with three single mouth bars based on swing conditions of rivel estuary and two composite mouth bars according to whether they are developed at the same time.
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5

Chaiwongsaen, Nikhom, Parisa Nimnate, and Montri Choowong. "Morphological Changes of the Lower Ping and Chao Phraya Rivers, North and Central Thailand: Flood and Coastal Equilibrium Analyses." Open Geosciences 11, no. 1 (April 9, 2019): 152–71. http://dx.doi.org/10.1515/geo-2019-0013.

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Анотація:
Abstract The Chao Phraya River flows in the largest river basin of Thailand and represents one of the important agricultural and industrial areas in Southeast Asia. The Ping River is one major upstream branch flowing down slope southwardly, joining the Chao Phraya River in the low-lying central plain and ending its course at the Gulf of Thailand. Surprisingly, the overflow occurs frequently and rapidly at the Lower Ping River where channel slope is high, and in particular area, sand-choked is extensively observed, even in normal rainfall condition. In contrary, at the downstream part, the erosion of river bank and shoreline around the mouth of Chao Phraya River has been spatially increasing in place where there should be a massive sediment supply to form a delta. Here we use Landsat imageries taken in 1987, 1997, 2007 and 2017 to analyze geomorphological changes of rivers. Results show that both rivers have undergone the rapid decreasing of water storage capacity and increasing of sand bar areas in river embayment. The total emerged sand bar area in the Lower Ping River increases from 1987 to 2017 up to 28.8 km2. The excessive trapped bed sediments deposition along the upper reaches is responsible for the shallower of river embankment leading to rapid overflow during flooding. At the Chao Phraya River mouth, a total of 18.8 km2 of the coastal area has been eroded from 1987 to 2017.This is caused by the reducing of sediment supply leading to non-equilibrium in the deltaic zone of the upper Gulf of Thailand. There are several possibility implications from this study involving construction of weir, in-channel sand mining, reservoir sedimentation and coastal erosion management.
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6

Yuskar, Yuniarti, and Tiggi Choanji. "Uniqueness Deposit of Sediment on Floodplain Resulting From Lateral Accretion on Tropical Area." Journal of Geoscience, Engineering, Environment, and Technology 2, no. 1 (March 1, 2017): 14. http://dx.doi.org/10.24273/jgeet.2017.2.1.12.

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Анотація:
Kampar rivers has a length of 413 km with average depth of 7.7 m and width of 143 m. Sixty percent of this rivers are meandering fluvial system which transport and deposit a mixture of suspended and bed-load (mixed load) along low energy. River channel that moving sideways by erosion is undergoing lateral migration and the top of the point bar becomes the edge of the floodplain and the fining-upward succession of the point bar will be capped by overbank deposits of Kampar River. Along the Kampar Rivers, there are more than 60% of floodplain sediments and almost all of the floodplain formed by bend migration on the suspended-load channels of Kampar watershed. This formation consist of succession of fine to medium sand and silt/mud, with root traces, that form as drapes on the prograding bank. These beds dip mostly channel wards and quickly wedge out as they grade up and onto the floodplain. The depositional model is presented showing how lateral accretion can make a significant contribution to the preservation of fine-grained within channel deposits in contemporary floodplains. The examples presented here demonstrate that analogues to ancient point-bar deposits containing alternating sandstone and shale sequences are common in the low-energy fluvial environments of Riau rivers especially Kampar rivers.
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7

Shan, Xin, Xuefa Shi, Peter D. Clift, Ashraf Ali Seddique, Shengfa Liu, Chengpeng Tan, Jianguo Liu, Rased Hasan, Jingrui Li, and Zhaojun Song. "Sedimentology of the modern seasonal lower Ganges River with low inter-annual peak discharge variance, Bangladesh." Journal of the Geological Society 178, no. 1 (October 9, 2020): jgs2020–094. http://dx.doi.org/10.1144/jgs2020-094.

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Анотація:
The Ganges River, one of the largest rivers on Earth, is a typical monsoonal and flood-controlled system but has low inter-annual peak discharge variability. The seasonal discharge can reach 70 000 m3 s−1 during the wet season but maintains a low base flow of 500–3000 m3 s−1 during the dry season. However, the constancy in peak discharge every year categorizes the lower Ganges River as a river with low inter-annual peak discharge variability. This paper examines the modern lower Ganges River by conducting a detailed process-oriented investigation of the main channel, channel margin and overbank deposits, supplemented by satellite image observation and comparison with other modern fluvial systems. The channel and braid bar deposits show a dominance of small-scale to medium-scale cross-sets, with a variety of accretion processes constructing braid bars. The braid bar and channel deposits are typical of facies models of rivers with low inter-annual peak discharge variance. In contrast, the channel flank deposits are dominated by planar lamination, massive sand and mud couplets, and some ripple cross-lamination, with very little cross-bedding. Characteristic channel margin deposits represent sediments that accumulated by high-speed flows, multiple-surge and rapidly depositing flows, rapid or regular waning flows and hyperconcentrated flows. The overbank deposits predominantly comprise current ripples with long, thin bedforms and soft sediment deformation structures, which record flow transformation on the muddy flat topography and the processes of an unstable river bank. Our study shows that the channel margin and floodplain deposits are entirely different from those of the braid bar and channel. The bedform distribution of the fluvial deposits here (main channel, channel margin and overbank) may be an important tool in the identification of similar seasonal rivers with low inter-annual peak discharge variance and in the interpretation of fluvial processes.Supplementary material: The sediment texture and the depositional age is available at: https://doi.org/10.6084/m9.figshare.c.5144403
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8

Hashimoto, Kana, Takenori Shimozono, Yoshinao Matsuba, and Takumi Okabe. "Unmanned Aerial Vehicle Depth Inversion to Monitor River-Mouth Bar Dynamics." Remote Sensing 13, no. 3 (January 25, 2021): 412. http://dx.doi.org/10.3390/rs13030412.

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Анотація:
Monitoring the morphological evolution of a river-mouth bar is of both practical and scientific importance. A large amount of sediment is transported from a river to surrounding littoral cells via a deltaic bar after an extreme weather event. However, it is often not feasible to capture drastic morphological changes in the short term with conventional bathymetric surveys. This paper presents a depth-inversion method based on unmanned aerial vehicle technology to estimate two-dimensional bathymetry from video-sensed swell propagation. The estimation algorithm is tested over four cases with varying wave and bathymetric conditions and is validated with transect survey data. The test results suggest that the method can estimate deltaic-bar topography in front of a river mouth with a root-mean-square error of <0.5 m. The applicable range is limited by wave breaking in the inner bar and up to a depth of ~8 m, where swell intensity signals become ambiguous. A comparison of the different cases shows that the method works better under calm weather conditions with dominant swells propagating from non-local sources. Significant morphological changes of a river-mouth bar due to a powerful typhoon are successfully detected by observations right before and after the event.
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9

Kolozsvári, István, József Molnár та György Dévai. "Recent river channel change detections in the section of the River Tisza above Tiszaújlak (BИЛОК)". Landscape & Environment 10, № 3-4 (31 серпня 2016): 123–30. http://dx.doi.org/10.21120/le/10/3-4/4.

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Анотація:
In the section above Tiszaújlak, despite the presence of embankments, the River Tisza shows active meandering tendency and it splits into branches resulting in side channels, dead channels and backwaters that follow the main channel. In our work we examined the right- and the left-side riverbank sections of the River Tisza, between Tiszaújlak (Вилок) and Tiszasásvár (Тросник), as well as between Tiszaújlak and Tiszapéterfalva (Пийтерфолво), to reveal the extent of bar depositions between 2006 and 2015, and to what extent the intensity and direction of the riverbank formation processes were influenced by the material of the bank and the plant coverage, its rate and characteristics. We tried to reveal which sections were eroded by the river and what security risks they have for the safety of the settlements along the Tisza River. On the right side of the Tisza River riverbank 51, and on the left side 62 main measuring points were recorded by GPS positioning satellite in 2009, 2010 and 2015. Our results were compared to the satellite images of Google Earth taken in 2006, too. According to our experience, in several bends of the examined sections of the river, active bar deposition can be observed; in some cases more than 100 m of bar depositions were detected.
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10

Wang, Zhaoyang, Hui Li, and Xiaobin Cai. "Remotely Sensed Analysis of Channel Bar Morphodynamics in the Middle Yangtze River in Response to a Major Monsoon Flood in 2002." Remote Sensing 10, no. 8 (July 24, 2018): 1165. http://dx.doi.org/10.3390/rs10081165.

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Анотація:
Channel bars are a major depositional feature in channels, and are considered as an important part of the morphodynamics of an alluvial river. The long-term morphodynamics of bars have been intensively investigated. However, relatively little is known about the response of channel bars to a major river flood, which is considered to be the predominant force in shaping bar morphology. This is especially the case for the monsoon-affected Yangtze River, where fluvial geomorphic work is largely carried out during monsoon floods. In this study, multi-temporal satellite images and river stage data were used to examine the morphodynamics of four large channel bars in the middle Yangtze River in response to a major monsoon flood in 2002. Based on bar surface areas estimated with Landsat images at different river stages, a rating curve was developed for each of the four bars, which was used to estimate bar volume through an integral process. Our study shows that two of the bars tended to be stable, while the other two experienced severe erosion during the flood. The results reveal that the flood caused a total bar surface area decrease of 1,655,100 m2 (or 8.30%), and a total bar volume decline of 5.89 × 106 m3 (or 6.10%) between the river stages of 20.81 m and 25.75 m. The volume decrease is equivalent to a sediment loss of approximately 8.25 × 106 metric tons, based on an average bulk density of 1.4 metric tons per cubic meter. The results imply that channel bars in the middle Yangtze River can also be large sediment sources rather than depositional areas during the flood. The decrease of sediment load in the middle of Yangtze River was found to be responsible for the dramatic morphodynamics of channel bars, which could last for a long period of time, depending on the operation of the Three Gorges Dam, which opened in 2003. Hence, we suggest making management efforts to protect the bars from further erosion.
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Більше джерел

Дисертації з теми "River bar"

1

Carlin, Mattia. "The response of river bar topography to the hydrological flow regime." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/312573.

Повний текст джерела
Анотація:
Alternate bars are large-scale bedforms characterised by an ordered sequence of scour zones and depositional diagonal fronts alternating along channel banks, which are typical of straight channelized rivers. Due to their high relief and migration properties, they represent a problem in river management, because they affect navigation, increase the flooding risk and interact with instream structures. For this reason, in the last decades many studies took the challenge of defining suitable criteria able to describe their morphometric properties. Theoretical, experimental and numerical works have clearly demonstrated that bar occurrence is a threshold process governed by the width-to-depth ratio of the channel, β. If this parameter exceeds a critical threshold, βcr, an instability mechanism amplifies the riverbed perturbations occurring due to the effect of the turbulent flow on the cohesionless riverbed, leading to the spontaneous growth of finite amplitude bars. Under steady flow conditions, alternate bars achieve an equilibrium configuration, whose amplitude value is related to the difference β-βcr. Much less information is available to describe bar characteristics under variable flow conditions, when the width-to-depth ratio changes in time and the amplitude of bars evolves depending on the duration and the shape of the hydrograph. The effect of a single idealized flood on bar amplitude evolution was successfully described by the weakly nonlinear model of Tubino (1991), which was able to capture the trajectory of bar amplitude during different stages of the flood. Supported by experimental results, he found that the response of bars crucially depends on the ratio between the flood duration and the bar-growth timescale. Nevertheless, the effect of a complex flow regime, characterised by a sequence of flow events, is to a large extent unexplored. Specifically, (i) the definition of a criterion to predict the average response of alternate bars in a river reach subject to an hydrological flow regime and (ii) the quantification of bar amplitude evolution due to a complex flow regime are still to a large extent unexplored. The goals of this work are: (i) to investigate the dependence of bar properties to variable discharge conditions; (ii) to analyse the effect of flow unsteadiness in terms of duration and sequencing of flood events and derive the main hydrological characteristics that primarily control the average response of bar amplitude; (iii) to determine the long-term bar geometry and define the "bar-forming'' discharge, which is the theoretical discharge that if maintained indefinitely would produce the same long-term bar response as the natural hydrograph; (iv) to analyse the effect that a sequence of flood events composing a complex flow series has on the evolution of bar amplitude. To pursue these purposes, we adopted a methodology primary based on theoretical models, then supported and validated through the analysis of laboratory experiments and field data. The methodology and the key results for the different parts of this thesis can be summarized as follows: 1. First, the response of bar topography to different flow stages has been investigated both theoretically and through the analysis of experimental data, observing the dependence of alternate bars to peculiar threshold conditions. The validity of weakly nonlinear model of Colombini et al. (1987), originally defined in the neighborhood of the critical condition βcr, has been extended taking into account the emersion of bars for low flows. 2. Subsequently, the average response of bars to idealized flow series has been analysed, exploring their dependence on the duration and sequencing of flood events. The probability density function has been found to be the essential hydrological information of the flow series required to determine the long-term response of bar amplitude, while the integral scale of flow sequence is a suitable metric to quantify the unsteadiness of a flow regime. 3. Then, an innovative approach has been introduced to define an occurrence criterion for alternate bars in straightened river reaches that accounts for the hydrological regime, and to determine the average bar state, with the corresponding "bar-forming'' discharge. The key novelty with respect to the classical methods adopted so far to predict the long-term equilibrium channel geometry is that in this case the morphodynamical work acted on river bars by relatively low-flow stages enhancing their formation can be reversed by high-flow stages that suppress them. Therefore, both the occurrence criterion and the average state are found from a balance between the cumulative effects of bar-forming and bar-suppressing events. 4. Finally, the weakly nonlinear model of Colombini et al. (1987), originally defined to predict the evolution of bars under steady flow conditions, has been extended to reproduce a natural flow series by considering the basic flow varying in time. This approach allows us to (i) statistically investigate the effect of flood magnitude and duration on the variations of bar amplitude and (ii) to simulate the morphological response of a river to alterations of the hydrological regime.The long-term analysis of bar amplitude, as such as its evolution subject to the hydrological flow regime, have been applied to four different study cases, each of them characterised by a distinctive average bar response: two reaches of the Alpine Rhine River, upstream and downstream the confluence of the River Ill (Switzerland), respectively, the Adige River near Trento (Italy) and the Isère River near Montmèlian (France). The theoretical model is able to capture both qualitatively and quantitatively the observed bed response. Specifically, it predicts the occurrence of high-relief bars for the upstream reach of the Alpine Rhine River and for the Isère River, while a plane configuration is predicted for the Adige River. Also the intermediate response of the downstream reach of the Alpine Rhine River is reproduced, showing a predominant flat bed morphology with sporadic low-relief bars.
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2

Carlin, Mattia. "The response of river bar topography to the hydrological flow regime." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/312573.

Повний текст джерела
Анотація:
Alternate bars are large-scale bedforms characterised by an ordered sequence of scour zones and depositional diagonal fronts alternating along channel banks, which are typical of straight channelized rivers. Due to their high relief and migration properties, they represent a problem in river management, because they affect navigation, increase the flooding risk and interact with instream structures. For this reason, in the last decades many studies took the challenge of defining suitable criteria able to describe their morphometric properties. Theoretical, experimental and numerical works have clearly demonstrated that bar occurrence is a threshold process governed by the width-to-depth ratio of the channel, β. If this parameter exceeds a critical threshold, βcr, an instability mechanism amplifies the riverbed perturbations occurring due to the effect of the turbulent flow on the cohesionless riverbed, leading to the spontaneous growth of finite amplitude bars. Under steady flow conditions, alternate bars achieve an equilibrium configuration, whose amplitude value is related to the difference β-βcr. Much less information is available to describe bar characteristics under variable flow conditions, when the width-to-depth ratio changes in time and the amplitude of bars evolves depending on the duration and the shape of the hydrograph. The effect of a single idealized flood on bar amplitude evolution was successfully described by the weakly nonlinear model of Tubino (1991), which was able to capture the trajectory of bar amplitude during different stages of the flood. Supported by experimental results, he found that the response of bars crucially depends on the ratio between the flood duration and the bar-growth timescale. Nevertheless, the effect of a complex flow regime, characterised by a sequence of flow events, is to a large extent unexplored. Specifically, (i) the definition of a criterion to predict the average response of alternate bars in a river reach subject to an hydrological flow regime and (ii) the quantification of bar amplitude evolution due to a complex flow regime are still to a large extent unexplored. The goals of this work are: (i) to investigate the dependence of bar properties to variable discharge conditions; (ii) to analyse the effect of flow unsteadiness in terms of duration and sequencing of flood events and derive the main hydrological characteristics that primarily control the average response of bar amplitude; (iii) to determine the long-term bar geometry and define the "bar-forming'' discharge, which is the theoretical discharge that if maintained indefinitely would produce the same long-term bar response as the natural hydrograph; (iv) to analyse the effect that a sequence of flood events composing a complex flow series has on the evolution of bar amplitude. To pursue these purposes, we adopted a methodology primary based on theoretical models, then supported and validated through the analysis of laboratory experiments and field data. The methodology and the key results for the different parts of this thesis can be summarized as follows: 1. First, the response of bar topography to different flow stages has been investigated both theoretically and through the analysis of experimental data, observing the dependence of alternate bars to peculiar threshold conditions. The validity of weakly nonlinear model of Colombini et al. (1987), originally defined in the neighborhood of the critical condition βcr, has been extended taking into account the emersion of bars for low flows. 2. Subsequently, the average response of bars to idealized flow series has been analysed, exploring their dependence on the duration and sequencing of flood events. The probability density function has been found to be the essential hydrological information of the flow series required to determine the long-term response of bar amplitude, while the integral scale of flow sequence is a suitable metric to quantify the unsteadiness of a flow regime. 3. Then, an innovative approach has been introduced to define an occurrence criterion for alternate bars in straightened river reaches that accounts for the hydrological regime, and to determine the average bar state, with the corresponding "bar-forming'' discharge. The key novelty with respect to the classical methods adopted so far to predict the long-term equilibrium channel geometry is that in this case the morphodynamical work acted on river bars by relatively low-flow stages enhancing their formation can be reversed by high-flow stages that suppress them. Therefore, both the occurrence criterion and the average state are found from a balance between the cumulative effects of bar-forming and bar-suppressing events. 4. Finally, the weakly nonlinear model of Colombini et al. (1987), originally defined to predict the evolution of bars under steady flow conditions, has been extended to reproduce a natural flow series by considering the basic flow varying in time. This approach allows us to (i) statistically investigate the effect of flood magnitude and duration on the variations of bar amplitude and (ii) to simulate the morphological response of a river to alterations of the hydrological regime. The long-term analysis of bar amplitude, as such as its evolution subject to the hydrological flow regime, have been applied to four different study cases, each of them characterised by a distinctive average bar response: two reaches of the Alpine Rhine River, upstream and downstream the confluence of the River Ill (Switzerland), respectively, the Adige River near Trento (Italy) and the Isère River near Montmèlian (France). The theoretical model is able to capture both qualitatively and quantitatively the observed bed response. Specifically, it predicts the occurrence of high-relief bars for the upstream reach of the Alpine Rhine River and for the Isère River, while a plane configuration is predicted for the Adige River. Also the intermediate response of the downstream reach of the Alpine Rhine River is reproduced, showing a predominant flat bed morphology with sporadic low-relief bars.
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3

Sanford, John Perkins. "DAM REGULATIONS EFFECTS ON SAND BAR MIGRATION ON THE MISSOURI RIVER: SOUTHEASTERN SOUTH DAKOTA." The University of Montana, 2008. http://etd.lib.umt.edu/theses/available/etd-09062007-094840/.

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4

Esposito, Christopher. "Differential Sedimentation In A Mississippi River Crevasse Splay." ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/1308.

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Анотація:
In this study the patterns of sediment transport and deposition in the channels and receiving basin of a crevasse splay in the modern Mississippi River delta are examined, with emphasis on the development of a distributary mouth bar. Simultaneous hydroacoustic and optical measurements on the mouth bar show that the bar conforms to the progradational stage of an existing conceptual model of mouth bar development. This is confirmed by cores dated using Beryllium-7, which provides a record of the deposition on the bar over a 90-day period. Stratigraphic data from cores obtained on the bar are used to extend the conceptual model to account for variable riverine inputs. A numerical model, developed and validated using field data is capable of representing the fundamental sedimentary processes responsible for mouth bar progradation. These results will be of interest to coastal geologists, engineers and coastal managers alike.
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5

寺本, 敦子, Atsuko TERAMOTO, 哲郎 辻本 та Tetsuro TSUJIMOTO. "植生域を伴う砂州の地形変化-木津川下流域を例として-". 土木学会, 2005. http://hdl.handle.net/2237/8587.

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6

McGregor, Gillian Kathleen. "The geomorphological impacts of impoundments, with particular reference to tributary bar development on the Keiskamma River, Eastern Cape." Thesis, Rhodes University, 2000. http://hdl.handle.net/10962/d1005510.

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The primary aim of this research was to develop and test a conceptual model of the geomorphological impacts of river regulation, based on a review of relevant international literature. It was motivated by the fact that there is very little local information on the topic, and it was intended that the model might provide a starting point for assessing the impact of impoundments on South African river systems. At present most research in South Africa on the impact of impoundments is undertaken from an ecological perspective. In order to manage our water resources sustainably it is necessary to have a better understanding of our river systems. South Africa is characterised by a variable climatic regime and, in order to supply water to the various user sectors of the nation, dams have to be larger than elsewhere in the world, to trap most of the mean annual runoff and provide a reliable water store (Alexander, 1985). South African dams have been designed to reduce the variability of a naturally variable regime. The impact of flow regulation in dryland rivers has been described as 'ecologically catastrophic at every level.' It is therefore hardly surprising that the impact of these dams on the natural functioning of rivers is substantial. The conceptual model showed that there are many responses to river impoundment, which are varied and complex, both in time and space. Responses or secondary impacts depended on the nature and degree of the primary impact or process alteration, on the sediment and flow regime of the river. High flows were affected in all cases and low flows were affected in most cases. The simplest form of change was Petts' (1979) concept of 'accommodation' of the regulated flow within the existing channel form. More complex responses occUrred where the channel perimeter was unstable, or where tributaries introduced fresh sediment loads. The river could adjust its long profile, cross sectional area and substrate composition by aggradation or degradation. The conceptual model was used in the Building Block Methodology to predict impoundment impacts at Instream Flow Requirement workshops on the Berg, Komati and Bivane rivers. It was also used in assessing the impact of the Sandile Dam on the Keiskamma river. Tributary junctions were identified as likely sites of change, and the morphology of bars at these junctions was investigated. Due to the number of variables affecting the sediment and flow regime in the system, and due to the fact that the primary impacts were not substantial, it was not possible to come to any decisive conclusions. It would seem that the dam is well located in the catchment, and, because the water is not heavily utilised, the secondary impacts are not great. The conceptual model was found to be a useful basic tool which might contribute to a better understanding of our river systems, and ultimately to improved sustainable resource management.
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Perkins, Ashley. "Distribution and abundance of nearshore aquatic habitat, Fraser River, British Columbia." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/237.

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Physical habitat for instream biota derives from a combination of stream system structural and hydraulic phenomena. Consequently, the quantity and quality of physical habitat is dynamic both over time and in space along the river, laterally, longitudinally and vertically. Its characterization through stream assessment and classification leads to a better understanding of factors that determine and limit habitat extent and quality. This thesis investigates the effects of space and time on nearshore aquatic habitat in the gravel reach of Fraser River, British Columbia by employing a large river, stage-adaptive habitat classification system. The distribution and abundance of habitat are spatially quantified at the reach scale (32 km), and temporally quantified through a period of about 60 years at several adjacent gravel bars (7 km), and at approximately 500 m3 s-1 increments in discharge during the declining limb of the flood hydrograph at two well-developed gravel bars. Of the ten habitat types evaluated, the bar edge habitat type is most abundant by length and number of units. However, its relative importance is reduced when weighted by fish-habitat association characteristics. Preferred habitat types (channel nook, eddy pool and open nook) are frequent and available to aquatic organisms, and most common at well-developed bars and in zones of equilibrium long-term sedimentation. Preferred habitat was at a maximum 30 years ago when major new bars developed and the thalweg shifted, effectively increasing the amount of bar shoreline and nearshore habitat. This increase is due to substantial change in river planform morphology following a 30-year period of large annual floods. However, amounts of habitat did not increase exclusively during periods of higher than average flows, or decrease exclusively during periods of lower than average flows. Instead, habitat abundance response to flow may occur with a two- or three-year lag. Short term changes in stage are critical to amount of preferred habitat. Optimal discharge for maximum preferred habitat vailability is in the range of approximately 2500 m3 s-1 to 4000 m3 s-1, which approximates long term mean flow. As flow increases, the proportion of preferred habitat compared with total bar shoreline decreases. Comparison with the 2006 flow duration curve shows that 15 – 30 % of discharges are optimal for maximum fish density and biomass. These discharges occurred during April 27 to May 17 and July 14 to August 7, 2006.
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8

Shampa. "Hydro-morphological Study of Braided River with Permeable Bank Protection Structure." Kyoto University, 2019. http://hdl.handle.net/2433/242463.

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9

Barens, Leonardus Maria. "Seismic and well test analysis methods to characterise fluvially deposited reservoir elements." Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/510.

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10

Sharp, Michael G. "Ghost Water Exhibition." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/6272.

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The Ghost Water exhibition of artworks by Michael Sharp was comprised of four main works titled: 30 x 60 Minute Grid Series, Suspension, History/Prehistory, and Lake Bonneville Remnants. The artwork was created as a reaction to the land that once held the prehistoric Lake Bonneville and to its current remnant Great Salt Lake. The work explores the dialogue between absence and presence.
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Книги з теми "River bar"

1

Commission, Canada Indian Claims. Eel River Bar First Nation inquiry Eel River Dam claim. [Ottawa]: The Commission, 1997.

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Canada. Indian Claims Commission (1991- ). Eel River Bar First Nation inquiry: Eel River Dam claim. Ottawa: The Commission, 1997.

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Pierce, Linda M. Dowel bar retrofit: I-90, Kachess River to Yakima River. [Olympia, Wash.]: Washington State Dept. of Transportation, 1994.

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4

United States. Bureau of Land Management, ed. Lower Salmon River boater's guide: Hammer Creek to Heller Bar. [Cottonwood, Idaho]: U.S. Dept. of the Interior, Bureau of Land Management, 1995.

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5

Transportation, Ontario Ministry of. Environmental study report: Highway 17 (new) Sault Ste Marie to Bar River Road. Toronto: Ministry of Transportation, 1996.

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6

Craig, James L. Annual report, Klamath River fisheries assessment program: Juvenile salmonid trapping on the mainstem Trinity River at Willow Creek and on the Klamath River at Big Bar, 1990. Arcata, CA: U.S. Fish and Wildlife Service, Coastal California Fishery Resource Office, 1992.

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7

Transportation, Ontario Ministry of. Highway 17 (New) - addendum to the 1996 environmental study report Sault Ste. Marie to Bar River Road. Mississauga, Ont: McCormick Rankin Corporation, 2003.

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8

Canada. Commission des revendications des Indiens. Enquête sur la revendication de la Première Nation d'Eel River Bar concernant le barrage de la rivière Eel. Ottawa, Ont: Commission des revendications des Indiens, 1997.

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9

Emma, Wolton, Helford Voluntary Marine Conservation Area Group., and HVMCAG, eds. A report to the Helford Voluntary Marine Conservation Area Group.: Bar Beach, Helford River Good Friday, 5th April 1996. Redruth: HVMCA Group, 1996.

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10

Big bad river. London: Robert Hale, 2003.

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Частини книг з теми "River bar"

1

Albayrak, Ismail, and Robert M. Boes. "Fish Guidance Structure with Wide Bar Spacing: Mechanical Behavioural Barrier." In Novel Developments for Sustainable Hydropower, 99–104. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99138-8_8.

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AbstractThis chapter deals with the fish guidance structures (FGS) with wide bar spacing and focuses on Curved-Bar Rack-Bypass Systems (CBR-BS) (Beck 2020) for fish protection and fish guidance at water intakes. In: Boes RM (ed) VAW-Mitteilung, vol 257. VAW, ETH Zurich, Switzerland. https://vaw.ethz.ch/en/the-institute/publications/vaw-communications/2010-2019.html, Beck et al., J Hydraul Res 58:807–818, 2020a; Beck et al., J Hydraul Res 58:819–830, 2020b; Beck et al., Water 12:3244, 2020c). FGS with wider bar spacing are classified as mechanical behavioural barriers and designed for use mainly at run-of-river hydropower plants (HPPs) and water intakes with large design discharges. In the following, different types of the FGS with wide bar spacing are introduced and, fish guidance performance and design recommendations of CBR-BS are presented.
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Katayama, T., M. Kuroiwa, Y. Kajikawa, and H. Kurashige. "Field Investigation for Morphodynamic of River Mouth Bar Using UAV and RTK-GNSS." In APAC 2019, 937–43. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0291-0_128.

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Ramkumar, Mu, K. Kumaraswamy, R. Arthur James, M. Suresh, T. Sugantha, L. Jayaraj, A. Mathiyalagan, M. Saraswathi, and J. Shyamala. "Sand Mining, Channel Bar Dynamics and Sediment Textural Properties of the Kaveri River, South India: Implications on Flooding Hazard and Sustainability of the Natural Fluvial System." In Environmental Management of River Basin Ecosystems, 283–318. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13425-3_14.

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4

Gonzalez, F. I., E. D. Cokelet, J. F. R. Gower, and M. R. Mulhern. "SLAR and In-Situ Observations of Wave-Current Interaction on the Columbia River Bar." In The Ocean Surface, 303–10. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-015-7717-5_41.

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5

Andrews, E. D., and J. M. Nelson. "Topographic response of a bar in the Green River, Utah to variation in discharge." In Water Resources Monograph, 463–85. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/wm012p0463.

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6

Billingsley, George H., and Donald P. Elston. "Geologic log of the Colorado River from Lees Ferry to Temple Bar, Lake Mead, Arizona." In Geology of Grand Canyon, Northern Arizona (with Colorado River Guides): Lee Ferry to Pierce Ferry, Arizona, 1–36. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft115p0001.

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7

Strużyński, Andrzej, Dorota Giriat, Ludivine Bouchet, Maciej Wyrębek, and Krzysztof Kulesza. "Numerical Modeling of Flow Dynamics on a Gravel Bar During High Discharge in a Mountain River." In GeoPlanet: Earth and Planetary Sciences, 441–54. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70914-7_30.

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8

Khan, S. T., S. Alam, N. Azam, M. Debnath, A. K. Mojlish, A. Rahman, F. M. Alvee, and M. Maliha. "A Study on Riverbank Erosion-Accretion and Bar Dynamics of Dharla River Using Multi-temporal Satellite Images." In Lecture Notes in Civil Engineering, 407–17. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5547-0_38.

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9

Roy, Suvendu, and Abhay Sankar Sahu. "Effect of Longitudinal Disconnection on In-stream Bar Dynamics: A Study at Selected Road–Stream Crossings of Ajay River." In Springer Geography, 81–97. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26443-1_6.

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10

Cheng, Haifeng, Pei Xin, Jie Liu, Fengfeng Gu, Qi Shen, and Lu Han. "Morphological Evolution and Driving Factors of Tidal Flats in the Yangtze Estuary (China) During 1998–2019." In Lecture Notes in Civil Engineering, 1152–67. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_101.

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AbstractThis paper studies the morphological evolution and driving factors of the tidal flats in the Yangtze Estuary (YE), based on the bathymetric data over the last 20 years (1998–2019) and a three-dimensional numerical model (SWEM3D). The results show that: In the past two decades, the combined action of fluvial sediment decline and estuarine engineering has changed the morphological evolution trend of tidal flats in the YE. The fluvial sediment decline caused the decrease of suspended sediment concentration successively from the inner estuary to the mouth bar area (the outer estuary), which led to the erosion and steepening of the tidal flats in the YE, and the erosion of tidal flats in the inner estuary was earlier and more obvious than that in the mouth bar area. The estuarine engineering is the main controlling factor of the distribution and trend change of erosion-deposition in the adjacent tidal flat. The waterway regulation projects promoted the deposition of tidal flats within its sheltered area, while the reclamation and reservoir projects intensified the erosion of the lower tidal flats nearby. As for the remaining non-human-intervention tidal flats, those adjacent to the mainstream of ebb current in the inner estuary were significantly eroded, while those on the north side of the channel were slowly deposited due to the weaker hydrodynamics. In the future, the fluvial sediment supply may keep decreasing and maintain a lower level under the continued influence of anthropogenic activities in the Yangtze River basin, the unprotected tidal flats in the YE will face a risk of further erosion. It is necessary to take appropriate protection measures to improve the ecological service function of the tidal flats in the YE.
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Тези доповідей конференцій з теми "River bar"

1

Varyu, D., B. Greimann, D. Bradley, and K. Russell. "Sand bar volume model: Improving modeled sand bar response in Marble Canyon." In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-179.

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2

Deguchi, Ichiro, Su kyong Chun, and Toru Sawaragi. "Study on Flushing of River Mouth Sand Bar." In 27th International Conference on Coastal Engineering (ICCE). Reston, VA: American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40549(276)296.

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3

Hajek, Elizabeth, Evan Greenberg, Ellen P. Chamberlin, and Paul Heller. "RECONSTRUCTING BAR AND CHANNEL MORPHODYNAMICS FROM ANCIENT RIVER DEPOSITS." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-286881.

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4

Furuike, Kou, Takaaki Uda, Masumi Serizawa, and Toshiro San-nami. "MODEL FOR PREDICTING DYNAMIC CHANGES IN RIVER MOUTH BAR." In Proceedings of the 30th International Conference. World Scientific Publishing Company, 2007. http://dx.doi.org/10.1142/9789812709554_0278.

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5

Ferreira, A., K. Mumford, S. Seyed, C. Fruetel, and A. Rey. "Physical and numerical modeling of hyporheic flow through a gravel bar." In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-216.

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6

Moorhead, Mackenzie, John Holbrook, Henry Henk, Simon Lang, Victorien Paumard, Mick O'Leary, and Pomeroy Smith. "BAR MIGRATION IN DRYLAND RIVER WITH HIGH-DISCHARGE VARIABILITY, THE DEGREY RIVER, NORTHWESTERN AUSTRALIA." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-378888.

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7

Lama, Sunil, and Mikio Kuroki. "Effect of alternate bar bed form on sediment division at junction flow." In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-69.

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8

Zamri, Z., J. Ariffin, J. Abdullah, and A. Ali. "Experimental study on effects of mid-bar to lateral migration—preliminary study." In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-82.

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9

Olson, Elizabeth D., Peter D. Clift, and Alexandra N. Lechnowskyj. "FACIES AND STRATAL ARCHITECTURES OF THE FALSE RIVER POINT BAR SYSTEM, LOWER MISSISSIPPI RIVER, LOUISIANA." In 50th Annual GSA South-Central Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016sc-273511.

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Olson, Elizabeth D. "FACIES AND STRATAL ARCHITECTURES OF THE FALSE RIVER POINT BAR SYSTEM, LOWER MISSISSIPPI RIVER, LOUISIANA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287621.

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Звіти організацій з теми "River bar"

1

Geyer, W. R., and Peter A. Traykovski. Rivers and Inlets DRI: Plume, Sediment and Bed Dynamics at the Columbia River Bar. Fort Belvoir, VA: Defense Technical Information Center, September 2013. http://dx.doi.org/10.21236/ada597880.

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2

Wright, D. J. Preliminary report on the stratigraphy and sedimentology of the huronian Bar River formation, Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120235.

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3

Newman, K. A. Final Project Report on Arsenic Biogeochemistry in the Clinch River and Watts Bar Reservoir, Volume 2: Quality Assurance/Quality Control Summary Report for Arsenic Biogeochemistry in the Clinch River and Watts Bar Reservoir. Office of Scientific and Technical Information (OSTI), January 1995. http://dx.doi.org/10.2172/814064.

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4

Newman, K. A., C. J. Ford, and J. T. Byrd. Final project report on arsenic biogeochemistry in the Clinch River and Watts Bar Reservoir: Volume 2, Quality assurance/quality control summary report for arsenic biogeochemistry in the Clinch River and Watts Bar Reservoir. Environmental Restoration Program. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/67262.

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5

Olsen, C., I. Larsen, P. Lowry, C. Moriones, C. Ford, K. Dearstone, R. Turner, B. Kimmel, and C. Brandt. Transport and accumulation of cesium-137 and mercury in the Clinch River and Watts Bar Reservoir system. Office of Scientific and Technical Information (OSTI), June 1992. http://dx.doi.org/10.2172/7206475.

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6

Tubman, Michael, Timothy Welp, Michael Sullivan, and Christopher Colombo. Evaluation of the use of a bedleveler to improve navigability of Atchafalaya River Bar Channel fluid mud. Coastal and Hydraulics Laboratory (U.S.), August 2017. http://dx.doi.org/10.21079/11681/22887.

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7

Ford, C. J. Final Project Report on Arsenic Biogeochemistry in the Clinch River and Watts Bar Reservoir, Volume 1: Main Text. Office of Scientific and Technical Information (OSTI), January 1993. http://dx.doi.org/10.2172/814557.

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8

Olsen, C., I. Larsen, P. Lowry, C. Moriones, C. Ford, K. Dearstone, R. Turner, B. Kimmel, and C. Brandt. Transport and accumulation of cesium-137 and mercury in the Clinch River and Watts Bar Reservoir system. Environmental Restoration Program. Office of Scientific and Technical Information (OSTI), June 1992. http://dx.doi.org/10.2172/10162352.

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9

Gailani, Joseph, Burton Suedel, Andrew McQueen, Timothy Lauth, Ursula Scheiblechner, and Robert Toegel. Supporting bank and near-bank stabilization and habitat using dredged sediment : documenting best practices. Engineer Research and Development Center (U.S.), August 2022. http://dx.doi.org/10.21079/11681/44946.

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In-water beneficial use of dredged sediment provides the US Army Corps of Engineers (USACE) the opportunity to increase beneficial use while controlling costs. Beneficial use projects in riverine environments include bank and near-bank placement, where sediments can protect against bank erosion and support habitat diversity. While bank and near-bank placement of navigation dredged sediment to support river-bank stabilization and habitat is currently practiced, documented examples are sparse. Documenting successful projects can support advancing the practice across USACE. In addition, documentation identifies data gaps required to develop engineering and ecosystem restoration guidance using navigation-dredged sediment. This report documents five USACE and international case studies that successfully applied these practices: Ephemeral Island Creation on the Upper Mississippi River; Gravel Island Creation on the Danube River; Gravel Bar Creation on the Tombigbee River; Wetland Habitat Restoration on the Sacramento-San Joaquin River Delta; and Island and Wetland Creation on the Lower Columbia River Estuary. Increased bank and near-bank placement can have multiple benefits, including reduced dredge volumes that would otherwise increase as banks erode, improved sustainable dredged sediment management strategies, expanded ecosystem restoration opportunities, and improved flood risk management. Data collected from site monitoring can be applied to support development of USACE engineering and ecosystem restoration guidance.
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10

Harris, Kathleen, and Travis Dahl. Technical assessment of the Old, Mississippi, Atchafalaya, and Red (OMAR) Rivers : HEC-RAS BSTEM analysis of the Atchafalaya River. Engineer Research and Development Center (U.S.), August 2022. http://dx.doi.org/10.21079/11681/45174.

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This report documents the bank erosion modeling performed under Task 6 (HEC-RAS Sediment Modeling) of the Old, Mississippi, Atchafalaya, and Red (OMAR) Rivers System Technical Assessment. The objectives of the bank erosion modeling effort were to compare the relative impact various flow scenarios might have on bank retreat on a stretch of the Atchafalaya River between Simmesport, LA, and the Whiskey Bay Pilot Channel. The effort included compilation of field and soil boring data, selection of bank retreat sites, creation of representative soil profiles for the reach, calibration of soil parameters to measured retreat rates, and modeling bank retreat and volume of material eroded under various flow scenarios. This modeling effort was intended for scenario comparison and should not be used as a prediction of exact rates of bank erosion. The study found that varying the amount of flow entering the Atchafalaya River from the Mississippi River could increase dramatically or significantly reduce the extent of bank erosion, relative to the current management scenario.
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