Relevant bibliographies by topics / River level fluctuation

Academic literature on the topic 'River level fluctuation'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "River level fluctuation"

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Muhadi, N. A., A. F. Abdullah, S. K. Bejo, M. R. Mahadi, and A. Mijic. "WATER LEVEL FLUCTUATION USING SURVEILLANCE CAMERA." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVI-4/W3-2021 (January 11, 2022): 257–60. http://dx.doi.org/10.5194/isprs-archives-xlvi-4-w3-2021-257-2022.

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Abstract. Floods are the most frequent type of natural disaster that cause loss of life and damages to personal property and eventually affect the economic state of the country. Researchers around the world have been made significant efforts in dealing with the flood issue. Computer vision is one of the common approaches being employed which include the use of image segmentation techniques for image understanding and image analysis. The technique has been used in various fields including in flood disaster applications. This paper explores the use of a hybrid segmentation technique in detecting water regions from surveillance images and introduces a flood index calculation to study water level fluctuations. The flood index was evaluated by comparing the result with water level measured by sensor on-site. The experimental results demonstrated that the flood index reflects the trend of water levels of the river. Thus, the proposed technique can be used in detecting water regions and monitoring the water level fluctuation of the river.
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Bhandari, Sushmita, Kabita Karki, Surendra Maharjan, and Suresh Das Shrestha. "Groundwater flow pattern and water level fluctuation in western parts of Chitwan valley." Journal of Nepal Geological Society 50, no. 1 (December 21, 2016): 51–54. http://dx.doi.org/10.3126/jngs.v50i1.22863.

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Study of flow pattern and water level fluctuation in the western part of the Chitwan Valley was carried out in the area of 274.48 km2. The study area consists of alluvial deposits of the Narayani and the Rapti River of Pleistocene to Recent age. Aquifers in the study area are unconfined and semi confined to confined types. Based on the static water level, Jagatpur, Sukranagar and Gunjanagar are deep tube well zone and Shivanagar, Parbatipur, Patihani, Gitanagar are shallow tube well zone. The western half area discharges groundwater to the Narayani River and southern half discharges to the Rapti River rather than getting recharged throughout the year. Average water level fluctuation is 2.34 m with high fluctuation of 4.88 m at Sukranagar and low 0.49 m at Dibyanagar VDC. This fluctuation is directly related to rainfall.
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Zhang, Zong Pu, Fu Lin Cai, Yu Long Hua, and Huan Cheng. "Study on the Influence of Tailrace Tunnel Outlet Bottom Slope on Water Level Fluctuation in the Tailrace Surge Tank." Advanced Materials Research 1065-1069 (December 2014): 644–49. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.644.

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Combining with hydraulic model experiment of water diversion and power generation system of one hydropower station, the effects of different connection patterns between the tailrace tunnel outlet and downstream river bed and flow states in the transient process on the water level fluctuation in tailrace surge tank have been investigated. The results show that: there is not remarkable influence on water level fluctuation when tailrace water level in downstream river is higher or close to the ceiling height. On the opposite side , it has notable influence on water level fluctuation in the tailrace surge tank when tailrace water level in downstream is lower than the ceiling height, and the water level fluctuation in tailrace surge tank presents some regularity under the same connection pattern when the tailrace water level in downstream river is lower than the ceiling height.
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Ji, Qianfeng, Shudan Xue, Quan Yuan, Yuan Yuan, Yuanming Wang, Ruifeng Liang, Jingjie Feng, Kefeng Li, and Ran Li. "The Tolerance Characteristics of Resident Fish in the Upper Yangtze River under Varying Gas Supersaturation." International Journal of Environmental Research and Public Health 16, no. 11 (June 6, 2019): 2021. http://dx.doi.org/10.3390/ijerph16112021.

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In circumstances where total dissolved gas (TDG) levels are variable, the peak TDG and duration are expected to be the dominant drivers of fish survival. Focusing on the peak TDG and duration in natural rivers, a laboratory experiment and field experiments in the upper Yangtze River were conducted with Prenant’s Schizothoracin (Schizothorax prenanti), a rare species inhabiting the upper Yangtze River, to examine the tolerance characteristics of fish under varying gas supersaturation levels. The results of the field experiments showed that TDG supersaturation in natural rivers changed greatly during the flood period due to reservoir regulation. The survival of fish was affected by TDG levels, water depth and TDG fluctuation range. A high TDG level, and shallow compensatory water depth caused fish mortality in the field experiment to be higher in September than in July. The results of the laboratory experiment showed that fish tolerance was lower under fluctuating TDG supersaturation than under constant TDG supersaturation. The tolerance of fish to TDG supersaturation varied depending on peak TDG and duration. Under the fluctuation range of 115–125%, fish survival in the 6 h–6 h cycle was significantly different from that in the 8 h–8 h cycle. The fluctuation cycle did not affect fish survival at the fluctuation range of 110–130%. Intermittent lower TDG supersaturation does not significantly increase the tolerance of fish. This study revealed the tolerance characteristics of resident fish in the upper Yangtze River to TDG supersaturation, which provides a reference to the ecological operation of reservoirs and may contribute to the protection of aquatic organisms.
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Que, Yanfu, Jiayi Xie, Jun Xu, Weitao Li, Ezhou Wang, and Bin Zhu. "Ecological Influences of Water-Level Fluctuation on Food Web Network." Water 13, no. 17 (August 29, 2021): 2371. http://dx.doi.org/10.3390/w13172371.

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Seasonal water-level fluctuations may lead to changes in river nutrients, which causes corresponding changes in the trophic structure of an aquatic food web, and finally affects the whole ecosystem. In this study, we focused on the Ganjing River, a tributary of the Yangtze River, China. Common organisms were sampled and measured for carbon and nitrogen stable isotopes in the wet and dry seasons, respectively, and the relative contributions of different food sources were combined to construct the food web, so as to realize the influence of water-level fluctuation on aquatic food web. Our results showed that basal food sources for fish consumers were endogenous carbon sources such as POM, zooplankton and zoobenthos in the dry season, while high water level exposed fish to more diverse and abundant food sources, and the contribution proportions of exogenous carbon sources (e.g., terrestrial detritus) to consumers increased in the wet season. In parallel, the abundance and species diversity of fish were higher than those in the dry season. Most fish species had relatively higher trophic levels in the dry season compared to the wet season, because the increase in fish densities led to an increase in piscivores fish. The food web was composed of planktonic and benthic food chains in the dry season. During the wet season, the planktonic food chain was dominant, followed by the herbivorous food chain, and the benthic food chain was relatively less important. Therefore, water-level fluctuation may alter the trophic linkages within fish communities, which contributed to a more complex and interconnected food web. Moreover, as we expect, the stable isotope analysis food web was broadly in line with the gut content analysis food web.
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Shafeek, Ahmed M., Hamdy Salah, Nabila Shehata, and A. B. Saddek. "The impact of fluctuation of the Nile River level on water composition." Water Practice and Technology 12, no. 2 (June 1, 2017): 423–31. http://dx.doi.org/10.2166/wpt.2017.040.

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This paper studies the influence of fluctuation of the Nile River level on water composition. The Nile River could be classified to four periods according to level. The periods are flood, intermediate, drought and intermediate. The present study investigates the biological and chemical analysis of water at all periods of the Nile River. The results show that the algae count ranged from 221 to 2,069 organism/ml during flood and drought periods respectively. By contrast, the change in the concentration of chemical elements was very slight, whether in the period of drought or flood period. This means that the fluctuation of the Nile River level had a significant impact on its biological nature rather than chemical nature. It could be argued that this is due to the algae's ability to absorb chemical elements.
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Matsumura-Tundisi, T., JG Tundisi, F. Souza-Soares, and JEM Tundisi. "Zooplankton community structure of the lower Xingu River (PA) related to the hydrological cycle." Brazilian Journal of Biology 75, no. 3 suppl 1 (August 2015): 47–54. http://dx.doi.org/10.1590/1519-6984.03814bm.

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Abstract The zooplankton community of the lower Xingu River shows strong fluctuations in species richness and number of organisms during periods of water level fluctuation. Pulses of density and species richness are adapted to the pulses in water flows and water level. This is conected with reproductive strategies of some zooplankton groups. The spatial heterogeneity of the lower Xingu River consisting of braided channels, bedrocks, macrophyte stands, is probably a relevant factor for the species richness of the zooplankton communities, and may be a fundamental factor for the overall aquatic biodiversity of the lower Xingu River.
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Dahlstedt, Kajsa, and Henrik Jeldtoft Jensen. "Fluctuation spectrum and size scaling of river flow and level." Physica A: Statistical Mechanics and its Applications 348 (March 2005): 596–610. http://dx.doi.org/10.1016/j.physa.2004.09.039.

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Yu, Hui, Qiang Li, Li Xin Wei, Zhong Kai Xiao, Shuang Cao, and Wei Guo Zhang. "The Pattern and Cause Analysis of Tidal Level Fluctuation of the Yangtze River in Nanjing Section." Applied Mechanics and Materials 641-642 (September 2014): 101–7. http://dx.doi.org/10.4028/www.scientific.net/amm.641-642.101.

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This paper used the Mann-Kendall test, Spearman rank correlation test, Pettitt-Mann-Whitney change-point statistics, and complex Morlet wavelet analysis method to analyze the trend, change-point, and period of the tidal level at Nanjing Station from 1950 to 2012. The results demonstrated that there was a significant increase of annual highest and lowest tidal levels, while the trend of annual average tidal level change was not obvious. Significant mutations existed not only in the term of annual highest tidal level but also in the lowest one: the annual highest tidal level increased by 0.49m after 1972, while the annual lowest one increased by 0.29m after 1982. The period of annual average tidal level, highest one, and lowest one were 10 years, 15 years, and 14 years respectively. The scale of fluctuations in the annual highest tidal level was close to the annual lowest tidal level. The cause analysis of fluctuation indicated that runoff variation was the dominant factor of tidal level change.
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Kong, Bo, Huan Yu, and He Ping Tao. "Responses Analysis on Groundwater Level Fluctuations in Coastal Wetland." Advanced Materials Research 518-523 (May 2012): 4222–26. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.4222.

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We analyzed the relationship of groundwater level of wetlands at the Yellow River mouth to the ocean tide responses, as well as its impact on the spatial distribution of wetland types by field positioning observations of coastal wetland groundwater levels. The results showed that, the groundwater level is significantly affected by the tides. Its fluctuation has a negative polynomial relationship with its distance to the coast. Their correlation reached maximum during spring tide (R2=0.79); the closer to the coast, the greater the groundwater level fluctuation is, the greater the interaction between the seawater and the groundwater, the smaller the groundwater depth; In contrast, the further from the coast, the smaller the level fluctuation is, the greater the groundwater depth level. The spatial distribution of coastal wetlands is greatly affected by groundwater level and ocean tide. Thus reasonable protection of the region is of importance for protection of both the seawater and groundwater qualities.
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Dissertations / Theses on the topic "River level fluctuation"

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Ingalls, Brian R. "Biotic and taphonomic response to lake level fluctuations in the Greater Green River Basin (Eocene), Wyoming." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1153505477.

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Cuddy, Alan Stuart 1954. "The effects of Columbia River stage fluctuations on ground-water levels near Richland, Washington." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/191976.

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An analysis of time-series data from wells monitoring deep, confined aquifers near Richland, Washington was conducted to quantify the effects of Columbia River stage fluctuations on water levels in these aquifers. Water levels respond to long-term time trends, atmospheric pressure fluctuations, earth tides, and river stage fluctuations. The effects of the river were isolated and quantified using spectral analysis and multiple regression. Water levels in the shallow (<600 m) aquifers responded to hydraulic communication with the river and loading by the river. The deeper aquifers (>600 m) responded only to loading. The results gave support to current estimates of hydraulic conductivity and specific storage of the units. Multiple regression and spectral analysis were found to be effective in identifying and quantifying causes of water-level fluctuations.
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Tsoflias, Georgios Padelis. "Common cyclicites in seismicity and water level fluctuations at the Charlevoix seismic zone of the St. Lawrence River /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10242009-020326/.

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Tsoflias, Georgios Padelis. "Common cyclicities in seismicity and water level fluctuations at the Charlevoix seismic zone of the St. Lawrence River." Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/45314.

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Intraplate seismicity has no widely accepted explanation for its origin. The Hydroseismicity hypothesis, developed by Costain and co-workers, suggests that natural increases in hydraulic head, caused by transient increases in water table elevation, can be transmitted to hypocentral depths (10-25 km) in a fractured, prestressed, near-failure crust, and along with long term hydrolitic weakening of rocks, contribute to the triggering of earthquakes. In this study, the temporal characteristics of seismicity and water level fluctuations at the Charlevoix seismic zone on the Saint Lawrence river are investigated to provide a test of the Hydroseismicity hypothesis. To characterize the temporal release of seismic energy, two measures of seismic activity are considered for the available 200-year record of seismicity: the strain factor (magnitude dependent), and the number of events per unit time (magnitude independent). Residual analysis, applied to the strain factor time series, indicates a cyclical variation of the seismicity with long term periods ranging from 65 to 70 years. Fourier spectral analysis, applied on both strain factor and number of events time series, indicates the presence of short term cyclicities of seismic energy release at 13 to 14 year periods, along with longer-term cyclicities of approximately 55 to 70 year periods. Fisher’s periodogram ordinate test, applied to the spectral analyses results to determine the significance of the largest periodogram ordinate with respect to the average, tested the 13.4-year periodogram ordinate of the number of events time series significant at the 10% level, whereas the 13.4-year periodogram ordinate of the strain factor time series failed to test statistically significant. Analysis of the residual water level 70 year-long time series indicates a cyclical process with quarter cycles of approximately 20 years, suggesting a complete cycle of 70 to possibly 80 years. Fourier spectral analysis of the water level data set indicates cyclicities with periods of 1, 23, 14, and 8 years. The Grenander-Rosenblatt method (Priestley, 1981), applied to the spectral analysis results, tests the statistical significance of the largest periodogram ordinates, and showed the 1, 23, 14, and 8-year periodogram ordinates to be significant at the 1% level. Cyclicities present in the water level and seismicity time series were investigated for temporal (time lag) relationships using Group Delay analysis, a procedure that tests for time relationships at selected bandwidths. The maximum value of the Group Delay function occurs at the 14 year period with a time lag of + 2.3 years, indicating that the water levels lead the seismicity time series. The crustal diffusivity values estimated from the Group Delay analysis of the 14 year center period, range between 0.3 m²/sec and 2.7 m²/sec for a depth interval from 7 to 20 km. Direct correlation between depth and crustal diffusivity is not justified with the data at hand; however, the range of estimated diffusivities is within the range of published values of diffusivities for the crust (0.1 to 100m²/sec). This study allows for a possible causal relationship between repetitive mechanical effects of pore pressure transients and seismicity in the Charlevoix seismic zone. The temporal behavior of the physical processes studied is in general agreement with the Hydroseismicity model.
Master of Science
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McFarland, Andrew J. "Using Ostracode Dynamics to Track Ecosystem Response to Climatically and Tectonically Induced Lake-Level Fluctuations in Fossil Basin, Green River Basin, Wyoming, USA." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1348242706.

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Liang, Chen. "Spatial simulation based riverbank slope instability and susceptibility assessment in the Lower River Murray." Thesis, 2015. http://hdl.handle.net/2440/98718.

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Riverbank collapse is a natural and expected phenomenon associated with the evolution of rivers worldwide and has been studied extensively over the last two decades and remains an active research topic. The evolution of riverbank stability analysis has followed closely the developments in analytical methods, investigation tools, stabilisation methods and data acquisition technology. Furthermore, the stability of riverbanks is a multifaceted issue which involves the study of geology, topography, stratigraphy, hydrology, climate, spatial variation and geotechnical engineering. The River Murray is one of the only river systems in the world that can fall below sea level due to the barrages preventing the inflow of sea water during periods of low river flows. Over the last few years, an unprecedented period of dry conditions and low flows between 2005 – 2010 led to more than 162 reported riverbank collapse-related incidents along the Lower River Murray, in South Australia (downstream of Lock 1 at Blanchetown to Wellington). Those collapse-related incidents threatened public infrastructure, private property and the safety of river users, and also provide significant challenges for environmental and river management. From the inventory of the South Australian Department of Environment, Water and Natural Resources (DEWNR), riverbank collapse, erosion, cracking, tree leaning and collapse and levee problems are the main forms of the recorded incidents. Geographical information systems (GIS) is well known for its efficient and cost-effective spatial data processing capabilities, which include spatial data collection, manipulation and analysis, and has been widely used in riverbank instability research. As a significant feature of this thesis, GIS, incorporating high-resolution spatial data, such as aerial photographs and LIDAR (light detecting and ranging) images, facilitates the assessment of riverbank instability in several ways. Firstly, the actual location of the historical collapse can be determined and verified by the use of high-resolution aerial image comparison and interpretation to facilitate accurate back-analyses. Secondly, the 2D and 3D geometry of the riverbank is able to be readily extracted from the LIDAR digital elevation models (DEMs). Thirdly, the dimensions of the predicted collapsed regions can be validated against high-resolution aerial images, and finally, the influencing factors are able to be manipulated and mapped with GIS to predict regions susceptible to riverbank collapse. This thesis aims to: (1) examine the failure mechanisms affecting riverbank collapse along the Lower River Murray and identify the most relevant mechanism; (2) identify potential triggers for riverbank collapse events that should be monitored and managed in the future; (3) develop a framework, incorporating spatial information, GIS and geotechnical data, to facilitate the prediction of riverbank collapse along the Lower River Murray (between Blanchetown and Wellington, South Australia); and (4) develop a framework, based on GIS and geotechnical data, to identify regions susceptible to high risk of riverbank collapse along the Lower River Murray. In order to realise these aims, numerical analyses have been performed using two commercially available software programs, ArcGIS and SVOffice, which integrate the limit equilibrium method, back-analysis of collapse incidents, transient unsaturated flow modelling, steady state modelling, and DEMs and high-resolution aerial images within a GIS framework. The modelling has been informed by a series of geotechnical investigations undertaken at various sites along the River Murray.
Thesis (Ph.D.) (Research by Publication) -- University of Adelaide, School of Civil, Environmental & Mining Engineering, 2015.
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Jaček, Matouš. "Příčiny změn vývoje vybraných fluviálních jezer Lužnice v profilu Základna." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-388327.

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The aim of this thesis is to evaluate developement of selected lakes in area Základna in upper Lužnice basin. The area of interest is located in nature reservation Horní Lužnice, which extends from state border with Austria to Suchdol nad Lužnicí. This part of the river is very preserved almost without any anthropogenic influence. Eventhough it is the middle part of the river, it has developed floodplain with meandering belt, which is typical for lower parts of rivers. Because of its conditions, this area is very convenient for observing natural spills and studying fluvial lakes, which occure here in huge amount. First part of this work describes characteristic of the study area, fluvial lakes and natural spills and floods in the area. The main second part focuses on research of selected lakes and their developement. During several field researches the lakes were mapped and measured and soil samples were taken from the lake beds. Furthermore flow in floodplain during river spill was measured and data from automatic surface level sensors were evaluated, which show mutual connections of fluctuations of the lakes and the river. In conclusion the results of measurement were compared with previous theses regarding this area. Main results are that common spills cause clogging of lakes but intense floods...
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Bruns, Alan Craig. "Investigation of ground water level fluctuations at the Savannah River Site." 2000. http://purl.galileo.usg.edu/uga%5Fetd/bruns%5Falan%5Fc%5F200005%5Fms.

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Kiesel, Diann Susan. "Holocene stratigraphy of the river-mouth sediments of the Pigeon River, Eastern Wisconsin implications for lake-level fluctuations /." 1998. http://catalog.hathitrust.org/api/volumes/oclc/40295700.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1998.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 78-84).
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Cuddy, Alan Stuart. "The effects of Columbia River stage fluctuations on ground-water levels near Richland, Washington." 1988. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1988_168_sip1_w.pdf&type=application/pdf.

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Books on the topic "River level fluctuation"

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Robichaud, Alain. Fluctuating water levels in the St. Lawrence River. [Montréal]: Saint-Laurent Vision 2000, 1998.

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Freiwald, D. A. Effects of fluctuating river-pool stages on ground-water levels in the adjacent alluvial aquifer in the lower Arkansas River, Arkansas. Little Rock, Ark: Dept. of the Interior, U.S. Geological Survey, 1988.

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Freund, Holger, ed. E&G - Quaternary Science Journal Vol. 61 No 2. Greifswald, Germany: Geozon Science Media, 2012.

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Aimo, Nino J. Preliminary numerical study of the effects of fluctuating river level on solute transport within riverbank aquifers. 1987.

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Methods of alleviating the adverse consequences of fluctuating water levels in the Great Lakes-St. Lawrence River Basin: A report to the governments of Canada and the United States. [Washington, D.C: IJC, 1993.

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Book chapters on the topic "River level fluctuation"

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Eshetie, Sisay Mengistie, and Mengistie Abate Meshesha. "Lake Level Fluctuation Impact on River Morphology Change." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 99–111. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93712-6_7.

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Ali, Md Firoz, Supia Khatun, and Yasser Arafat. "An Experimental Study on the Influence of Water-Level Fluctuation on Stability of Slope of Model River Bank Composed of Cohesionless Material." In Lecture Notes in Civil Engineering, 191–207. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5601-9_17.

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Swenson, E. M., and C. E. Sasser. "Water level fluctuations in the Atchafalaya Delta, Louisiana: tidal forcing versus river forcing." In Dynamics and Exchanges in Estuaries and the Coastal Zone, 191–208. Washington, D. C.: American Geophysical Union, 1992. http://dx.doi.org/10.1029/ce040p0191.

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Park Boush, Lisa E., Christine M. S. Hall, Lucas S. Antonietto, and Andrew J. McFarland. "Ecological Response of Ostracodes (Arthropoda, Crustacea) to Lake-Level Fluctuations in the Eocene Green River Formation, Fossil Basin, Wyoming, USA." In Limnogeology: Progress, Challenges and Opportunities, 207–31. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66576-0_7.

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"river level fluctuation." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1125. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_182540.

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"Influence of river level fluctuation on the stability of high floodplains bank slope." In Advanced Materials, Structures and Mechanical Engineering, 117–22. CRC Press, 2016. http://dx.doi.org/10.1201/b19693-24.

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Cretescu, Igor, Zsofia Kovacs, Liliana Lazar, Adrian Burada, Madalina Sbarcea, Liliana Teodorof, Dan Padure, and Gabriela Soreanu. "Danube Delta: Water Management on the Sulina Channel in the Frame of Environmental Sustainability." In River Deltas - Recent Advances [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97877.

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The Danube Delta is the newest land formed by both transporting sediments brought by Danube River, which flows into the Black Sea and by traversing an inland region where water spreads and deposits sediments. Diurnal tidal action is low (only 8–9 cm), therefore the sediments would wash out into the water body faster than the river deposits it. However, a seasonal fluctuation of water level of 20 cm was observed in the Black Sea, contributing to alluvial landscape evolution in the Danube Delta. The Danube Delta is a very low flat plain, lying 0.52 m above Mean Black Sea Level with a general gradient of 0.006 m/km and only 20% of the delta area is below zero level. The main control on deposition, which is a combination of river, wind-generated waves, and tidal processes, depends on the strength of each one. The other two factors that play a major role are landscape position and the grain size distribution of the source sediment entering the delta from the river. The Danube Delta is a natural protected area in the South-Eastern part of Romania, declared a Biosphere Reserve through the UNESCO “Man and Biosphere” Programme. Water is a determining factor for all the human settlements in the Biosphere Reserve, the whole Danube Delta being structured by the three branches of the Danube (Chilia, Sulina and Sfantu Gheorghe (Saint George)). Our case study is focused on the Sulina branch, also named Sulina Channel, which offers the shortest distance between the Black Sea (trough Sulina Port) and Tulcea (the most important city of the Danube Delta from economic, social and cultural points of view) for both fluvial and marine ships. The improvement of water resources management is the main topic of this chapter, in terms of water quality indicators, which will be presented in twenty-nine monitoring points, starting since a few years ago and updated to nowadays. During the study period, significant exceedances of the limit value were detected in case of nitrate-N (3.9–4.6 mg/L) at the confluence (CEATAL 2) with the Saint George branch and in the Sulina Channel after the Wastewaters Treatment Plant (WWTP) discharge area, as well as near two settlements, namely Gorgova and Maliuc. The higher concentrations of Nitrogen-based nutrients were caused by the leakage from the old sewage systems (where these exist) and the diffuse loads.
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Bai, Le, Hongmou He, Shu Li, Xinwei Guo, and En-kuan Li. "Risk Evaluation and Leakage Mechanism on Runoff in Coal Mining Area—A Case Study in Jinjie Coal Mine of Tuwei River." In Advances in Transdisciplinary Engineering. IOS Press, 2021. http://dx.doi.org/10.3233/atde210192.

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According to the aims of the runoff protection in coal mining area, taking Jinjie coal mine as an example, the risk zonation and mechanism of runoff leakage were carried out based on the dimen-sionless multi-factor information fusion technique. Based on the analysis of field exploration and borehole data, four key factors affecting the runoff leakage from the roof were identified, which included the deposition features of aquifer in Sala Wusu Group, the distribution of overburden rock and soil mass, effective thickness of aquiclude layer and the height of water flow cracking zone. The evaluation criterion was whether the development height of the water flow cracking zone reaches or exceeds the bottom plate of the sandy phreatic aquifer and even penetrates the surface ground, which results in the complete or partial leakage of the phreatic water. According the evaluation criterion, the influence of coal mining disturbance on runoff leakage was divided into three zones: zone of seriously runoff leakage, zone of general runoff leakage and zone of slight runoff leakage. Furthermore, the influence mechanism of different zones in coal mining also been discussed preliminarily, which included drainage Sarawusu aquifer, groundwater leakage in Sarawusu aquifer, water level fluctuation in Sarawusu aquifer and so on. Finally, classification pattern diagram was drawn.
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DOMINGUEZ, JOSE M. L., LOUIS MARTIN, and ABILIO C. S. P. BITTENCOURT. "SEA-LEVEL HISTORY AND QUATERNARY EVOLUTION OF RIVER MOUTH-ASSOCIATED BEACH-RIDGE PLAINS ALONG THE EAST-SOUTHEAST BRAZILIAN COAST: A SUMMARY." In Sea-Level Fluctuations and Coastal Evolution, 115–27. SEPM (Society for Sedimentary Geology), 1987. http://dx.doi.org/10.2110/pec.87.41.0115.

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Ky, Sambath, Juan Martinez, and Soksan Chhun. "Mechanical Stability of River Banks Submitted to Fluctuations of the Water Level." In Advances in Multi-Physics and Multi-Scale Couplings in Geo-Environmental Mechanics, 335–60. Elsevier, 2018. http://dx.doi.org/10.1016/b978-1-78548-278-6.50010-4.

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Conference papers on the topic "River level fluctuation"

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Neshaei, S. A., M. K. Abadi, and R. Vahedzadegan. "Investigation of crack development in concrete dams due to water level fluctuation during earthquakes." In RIVER BASIN MANAGEMENT 2015. Southampton, UK: WIT Press, 2015. http://dx.doi.org/10.2495/rm150241.

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Dong, Yun, Zejun Liu, Weizhong He, and Baotian Wang. "Effects of water level fluctuation on the deformation and stability of a widened embankment along a river." In International Conference on Civil, Transportation and Environmental Engineering (CTEE 12). Southampton, UK: WIT Press, 2013. http://dx.doi.org/10.2495/ctee120551.

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Xu, Jianxia, Jianzhu Wang, Bin Lu, Heng Xie, Lei Li, Ming Wang, and Ziye Zheng. "Restoration and Dynamic Pattern of Natural Herbaceous Vegetation of Xiangxi River�s Water-Level Fluctuation Zone in the Three Gorges Reservoir Area." In International Conference on Advances in Energy, Environment and Chemical Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/aeece-15.2015.73.

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Subernetkii, Igor, and Maria Negru. "О многолетних аспектах динамики численности общего и сапрофитного бактериопланктона в молдавском секторе р. Днестр." In International symposium ”Functional ecology of animals” dedicated to the 70th anniversary from the birth of academician Ion Toderas. Institute of Zoology, Republic of Moldova, 2019. http://dx.doi.org/10.53937/9789975315975.80.

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The article reflects the multiannual dynamics of the density of total and saprophytic bacterioplankton in the Dniester river on the territory of the Republic of Moldova. The diapazone of fluctuation was considerable large, varying for Ntot from 1.0 to 83.6 million cells/mL, Nsapr - from 0.19 to 192.0 thousand cells/mL. Both at the stations with low and high level of pollution a strong correlation between Ntot and Nsapr was found, which indicates the influence of climate factors on the increase of the number of aquatic microorganisms.
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Zhao, Guoquan, Baoqiang Jin, Liuhe Yang, Wei Li, Junliang Zhou, Lili Zhang, Fei Wang, et al. "Next Level of Complex Reservoir Geosteering: The New Generation of Ultra-High-Definition Directional Resistivity Propagation Method." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22208-ea.

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Abstract For most offshore and tidal zolone oil development in North China, one of the major challenges of the industry is high drilling uncertainty and low reservoir encountered rate at the braided river delta and fluvial deposition environment with the common characters of thin sand channels, severe lateral change, unstable sand structure and low sand connectivity. Optimizing the wellbore placement inside the complex reservoir and depicting the sand with detailed information are gradually being critical to real time geosteering in these areas. Over the last decades, the continuous improvement of distance-to-boundary logging while drilling workflows has dramatically enhance the drilling efficiency of horizontal well. However, relatively short depth of detection (DOD) and low sensitivity to multi-layer environment still cannot meet the requirement of drilling under these complicated geologies. To reduce the geosteering uncertainty and enhance formation evaluation in complex environment, a new advancement in mapping-while-drilling electromagnetic propagation resistivity method, with the industry's first combination of axial, tilted and transverse antennas and significant software enhancements, made a momentous progress for complex reservoir geosteering and characterization. Compared to the previous generation, this service could provide: Larger depth of detection which doubled the previous generation. For one hand, larger DOD means earlier proactive strategy for the well position optimization; For the other one, enlarged vision also helps achieve whole delineation of the target sand channel and thus much better geological understanding for the reservoir. More sensitivity for anisotropy and local sedimentary character. Improved measurements set and enhanced software algorithm can visualize the detailed characteristics inside the sand channel. With its up-to-eight-layer resistivity reconstruction, the refined inversion exceeds the existing propagation resistivity answer product. Outstanding performance was observed during the implementation. The target sand channel of 6-7m thickness could be delineated clearly by the refined inversion. It not only depicted the whole picture the sand body, but also provided an earlier sign of structural fluctuation, which ensured the success and high oil recovery rate of the horizontal section. For the well with higher anisotropy or more local sedimentary features, comparing to the blur reflection of the previous method, this ultra-high-definition technology could provide a sophisticated vision of the shape, thickness, direction and resistivity property of the local thin layers and shaly block. Reliable evidence of both outline and inside characteristics of the sand channels improved the further well path design and geological understanding. The ultra-high-definition mapping-while-drilling technology opened the market of complex deposition environment drilling. It remarkably increased the reservoir encountered rate and predictability of the environment, helping to reduce the budget and enhance drilling efficiency. The ultra-high-definition directional resistivity propagation method will surely lead the industry to the next level of the complex reservoir development.
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Fedorova, I. V., and E. A. Alekseeva. "ASSESSMENT OF RISKS OF HAZARDOUS HYDROMETEOROLOGICAL EVENTS OF BAIKAL REGION." In Культура, наука, образование: проблемы и перспективы. Нижневартовский государственный университет, 2021. http://dx.doi.org/10.36906/ksp-2021/82.

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Against the background of recent climatic fluctuations, the number of catastrophic hydro-meteorological processes is increasing. In this work, the problem of updating the methods for assessing the risks of hazardous hydro-meteorological phenomena (OHP) for the rivers of the drainage basin of Lake Baikal by the method of selection of theoretical distribution laws based on the available empirical data of the maximum annual water levels. The maximum water levels are calculated for catastrophic levels of 0.1% and 1%. For the assessment, a risk scale was used, where the increments in the height of the maximum water levels are categorized according to the degree of risk of occurrence. It was revealed that a very high risk of floods is typical for the basin of the Barguzin and Selenga rivers; the rivers Goloustnaya, Vydrina, and Verkhnyaya Angara are characterized by an average risk. Geoinformation methods were applied to solve the problems of forecasting the possible areas of flooded zones using the example of the river. Upper Angara - with. Upper Zaimka.
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Магрицкий, Д., D. Magrickiy, К. Можаева, and K. Mozhaeva. "THE FEATURES OF MODERN CHANGES OF MORPHOLOGY AND WATER REGIME OF CHANNELS IN SULAK AND TEREK RIVER DELTAS." In Sea Coasts – Evolution ecology, economy. Academus Publishing, 2018. http://dx.doi.org/10.31519/conferencearticle_5b5ce3d0c4b352.39136673.

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On the basis of available hydrological data and results of expedition sounding works the detailed analysis of long-term changes of water levels in the main channels of Terek and Sulak river deltas, vertical and planned deformations of channels, parameters of channels and a river stream is made. The contribution to change of water levels in channels of the water discharges, channel processes, mouth lengthening and sea level fluctuations is quantitatively estimated. Differentiation of delta channels on character and factors of channel processes and changes of water levels is executed. Reliable tools (in the form of empirical dependences) for calculation of water levels on hydrological posts in the Terek and Sulak river deltas on the main factors are created. Received for results allow to optimize water economic actions in deltas of Terek and Sulak, to deepen our knowledge of mouth processes, especially at considerable change of factors of these processes.
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Hamidi, Sajad A., and Bahram Khazaei. "A Frequency Domain Analysis on the Great Lakes Water Level Fluctuations and River Inflows." In World Environmental and Water Resources Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482964.013.

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Moreira, Daniel, José Macías, Ruben Hidalgo-León, and Guillermo Soriano. "Thermal Behavior of Soils Under Tidal Effect: A Case Study in Guayaquil, Ecuador." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87738.

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This research analyzes the tidal effect in the thermal properties of the ground for a case study in Guayaquil, Ecuador. A thermal response test (TRT) performed near the shore of the Guayas river presented periodic fluctuations in the thermal behavior concurrent with the tide cycle. First, an analytical solution for tide-induced water table fluctuations was used for the determination of the phreatic level for the days of the test. The analytical model accounted for the horizontal distance from the shore, the ground porosity, and permeability. Afterward, a geometric mean model was used to predict the thermal conductivity of soil considering the groundwater level fluctuations. Finally, a correlation between the effective thermal capacity of the ground and the phreatic level in the soil was found.
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Yuan, Long-Yi, Zhang-Yong Liu, Yong-Jun Feng, and Xin-Hua Xue. "Impact of Water Level Fluctuations on Soil Seed Bank along Riparian Zone in JingJiang River." In 2013 Third International Conference on Intelligent System Design and Engineering Applications (ISDEA). IEEE, 2013. http://dx.doi.org/10.1109/isdea.2012.199.

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Reports on the topic "River level fluctuation"

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Raja, Rameez Ali, Mustafa Kilic, Monica Prezzi, Rodrigo Salgado, and Fei Han. Implementation Study: Continuous, Wireless Data Collection and Monitoring of the Sagamore Parkway Bridge. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317367.

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This report presents, in detail, the development and implementation of a wireless solar powered DAQ system for continuous real-time monitoring of the Sagamore Parkway Bridge using the data collected from strain gauges installed in the bridge pier and its foundation piles. The data analysis showed that there is no significant change in the load-settlement response of the bridge pier 3 years after its construction. The pile cap contribution in carrying the total load carried by the bridge pier is significant (about 20%). The hourly ambient temperature trends match with the incremental bending moments measured on the bridge pier and the piles. The daily temperature cycles also affected the load transferred between the piles within the pile group. The water level fluctuations of the Wabash River impacted the total load carried by the pier, such that a rise in water level resulted in slight drop in the total load carried by the bridge pier due to buoyant forces. The overall results of the bridge monitoring showed that the bridge has performed well since its construction.
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Environmental assessment for the natural fluctuation of water level in Par Pond and reduced water flow in Steel Creek below L-Lake at the Savannah River Site. Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/201732.

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Situation Report on Dry Season Hydrological Conditions in the Lower Mekong River Basin: November 2020–May 2021. Vientiane, Lao PDR: Mekong River Commission Secretariat, June 2021. http://dx.doi.org/10.52107/mrc.qx5yo1.

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This Situation Report presents a preliminary analysis of the Lower Mekong River Basin hydro-meteorological conditions over the 2020–2021 dry season. It shows fluctuations in water levels in the upper reaches of the Mekong mainstream in Lao PDR and Thailand, as well as low water volume stored in the Tonle Sap Lake. Rainfall in April–May was the highest on record for these months for the last 18 years in places. Overall, flows in the Mekong in the first five months of 2021 were also higher than the long-term average, except for December 2020 where flows in the Mekong mainstream were closer to normal. But river flows did not increase significantly.
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Effects of fluctuating river-pool stages on ground-water levels in the adjacent alluvial aquifer in the lower Arkansas River, Arkansas. US Geological Survey, 1988. http://dx.doi.org/10.3133/wri874279.

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Configuration of the water table and depth to water, spring 1980, water-level fluctuations, and water movement in the Snake River Plain Regional Aquifer System, Idaho and eastern Oregon. US Geological Survey, 1988. http://dx.doi.org/10.3133/ha703.

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