scholarly journals Effects of temperature and water levels on dynamics of density and structure of the fish population of the channel-floodplain complex of a large river in the period of spring floods

2019 ◽  
Vol 27 (3) ◽  
pp. 291-299
Author(s):  
A. A. Chemagin
Keyword(s):  
Water Level ◽  
Research Work ◽  
Water Levels ◽  
Water Bodies ◽  
Small Fish ◽  
Migration Pathway ◽  
Risk Of Predation ◽  
Initial Location ◽  
Riverbed Depression ◽  
Observation Period

The article discusses the features of the dynamic process of migration of ichthyofauna from wintering sites to the wetlands of a large boreal river for feeding and spawning. The influence of factors of temperature and water level on various groups of fish is estimated, and the role of water bodies of various types during fish migration in a flooded floodplain is also established. The research was performed during the spring flood in the floodplain-channel complex of the Irtysh River (Western Siberia, Russian Federation) in the water area of the conjugate water bodies: the lotic and lentic parts of the riverbed depression and the mouth of the tributary – transit section of the migration pathway of fish to the flooded floodplain. The research work was performed by “AsCor” – computerized hydroacoustic complex, hydroacoustic survey data were processed in the laboratory. The “AsCor” complex remotely performs taxonomic identification of abundant species of fish at the family level by groups (Cyprinidae, Percidae, Coregonidae–Esocidae, Acipenseridae–Lotidae). It was found that after the breakup of ice cover, maximum densities of fish were observed in the wintering sections – the initial location of the spring migration. During the 30-days observation period in the wintering sections and conjugate water bodies, the density of fish decreased from 4 to 13 times due to their migration to the floodplain. The response to a decrease in the overall density of fish in the year-round functioning lotic part of the riverbed depression to the influence of factors of water level and temperature regimes was >0.300 in general for ichthyofauna and for all groups of fish registered by hydroacoustic method (Cyprinidae, Percidae, Coregonidae–Esocidae, Acipenseridae–Lotidae). We constructed regression models of changes in the density of fish in the wintering sections of the river depending on the considered factors. Use of ANOVA analysis of variance confirmed the adequacy of the choice and the acceptability of the constructed models. We established a high statistically significant inverse correlation between the density of the fish, the water level and temperature regime for the mouth of the Konda River and the lentic part of the riverbed depression, which are transit sections of the migration pathway of fish in the floodplain. The lentic part of the riverbed depression may perform the function of a temporary station of fish during migration to the floodplain, which is beneficial from the point of view of bioenergetics resources. During the observation period, in the river flows there was a decrease in the proportion of larger fish and an increase in smaller individuals; in the lentic part of the riverbed depression, on the contrary, there was a reduced proportion of small fish and increase in the proportion of larger individuals.This pattern is explained by the reduced risk of predation by small fish in more turbulent conditions, as well as by an initial entry into the flooded floodplain of larger individuals of fish for spawning, followed by the smaller ones for feeding.

scholarly journals ICESat-2 Reservoir Applications: A case study from the largest man-made reservoir in India

2021 ◽  
Author(s):  
Surajit Ghosh ◽  
Atul Kaushik
Keyword(s):  
Water Level ◽  
Water Levels ◽  
Water Bodies ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Reservoir Storage ◽  
Inland Water ◽  
Change Impact ◽  
And Performance ◽  
Inland Water Bodies

Monitoring inland water levels is crucial for understanding hydrological processes to climate change impact leading to policy implementation. Satellite altimetry has proved to be an excellent technique to precisely measure water levels of rivers, lakes, and other inland water bodies. The ATL13 product of ICESat-2 space-borne LiDAR is solely dedicated to inland water bodies. The water surface heights were derived from ICESat-2's strong beams, and performance was assessed with respect to reservoir gauge observations. Statistical measurements were used to understand the agreement (R2= 0.99, %RMSE=0.08) among the datasets. An R2 value of 0.99 was observed between ICESat-2 derived water level anomaly and the reservoir storage anomaly. This study provides a unique opportunity to utilize the ATL13 data product to study reservoir water level variation and estimate the reservoir's storage. The methodology can also be helpful to understand the reservoir storage variation in a data-sparse region.

scholarly journals Characterization of SWOT Water Level Errors on Seine Reservoirs and La Bassée Gravel Pits: Impacts on Water Surface Energy Budget Modeling

2020 ◽  
Vol 12 (18) ◽  
pp. 2911
Author(s):  
Catherine Ottlé ◽  
Anthony Bernus ◽  
Thomas Verbeke ◽  
Karine Pétrus ◽  
Zun Yin ◽  
...  
Keyword(s):  
Water Level ◽  
Measurement Errors ◽  
Water Reservoir ◽  
Global Scale ◽  
Water Levels ◽  
Surface Energy Budget ◽  
Water Bodies ◽  
Energy Budgets ◽  
Gravel Pits ◽  
Better Than

The Surface Water and Ocean Topography (SWOT) space mission will map surface area and water level changes in lakes at the global scale. Such new data are of great interest to better understand and model lake dynamics as well as to improve water management. In this study, we used the large-scale SWOT simulator developed at the French Space National Center (CNES) to estimate the expected measurement errors of the water level of different water bodies in France. These water bodies include five large reservoirs of the Seine River and numerous small gravel pits located in the Seine alluvial plain of La Bassée upstream of the city of Paris. The results show that the SWOT mission will allow to observe water levels with a precision of a few tens of centimeters (10 cm for the largest water reservoir (Orient), 23 km2), even for the small gravel pits of size of a few hectares (standard deviation error lower than 0.25 m for water bodies larger than 6 ha). The benefit of the temporal sampling for water level monitoring is also highlighted on time series of pseudo-observations based on real measurements perturbed with the simulated noise errors. Then, the added value of these future data for the simulation of lake energy budgets is shown using the FLake lake model through sensitivity experiments. Results show that the SWOT data will help to model the surface temperature of the studied water bodies with a precision better than 0.5 K and the evaporation with an accuracy better than 0.2 mm/day. These large improvements compared to the errors obtained when a constant water level is prescribed (1.2 K and 0.6 mm/day) demonstrate the potential of SWOT for monitoring the lake energy budgets at global scale in addition to the other foreseen applications in operational reservoir management.

scholarly journals Fish distribution in riverbed depression and conjugated reservoirs (effects of lighting and turbulence)

2019 ◽  
Vol 2019 (4) ◽  
pp. 42-54
Author(s):  
Andrey Aleksandrovich Chemagin
Keyword(s):  
Open Water ◽  
Fish Population ◽  
Water Bodies ◽  
Predatory Fish ◽  
Dark Time ◽  
Risk Of Predation ◽  
Significant Difference ◽  
Irtysh River ◽  
Riverbed Depression ◽  
The Irtysh River

The paper describes the studies carried out by the hydroacoustic method in the open water period (spring) in the water area of the riverbed depression of the Irtysh River and its conju-gated water bodies (Western Siberia, the Russian Federation) in 2017. Collectively investigated reservoirs form a laminar-turbulent system, as they vary in intensity and direction of currents which form a certain turbulence and turbidity. It has been stated that in the dark time the fish population density increases in the waters of the reservoir with the maximal turbulence and turbidity rates - 166 NTU (the Irtysh river), and decreases in other water bodies (in the Konda river - 20.75 NTU and in the lentic section of the riverbed depression - 25 NTU). In the waters of conjugate reservoirs an increasing share of cyprinids is accompanying by a decrease in the proportion of predatory fish, while with an increase in predatory fish, on the contrary, the proportion of cyprinids decreases. A significant difference (P < 0.001) in terms of fish density was noted in the dark time. It was found that of the two factors (time of the day and turbulence) the second factor has a significant reliable effect (F = 18.518; P < 0.001) on the variable of fish population average density, both factors reliably interacting (F = 3.982; P = 0.037). There has been shown a transition of non-predatory fish to the site that is visually and hydrodynamically the most difficult for finding prey, which seems to be an element of reducing the risk of predation. Thus, there was found a significant influence of an abiotic factor of turbulence and, consequently, arising turbidity when interacting with the illumination factor on forming the increased fish concentration in the waters of the riverbed depression during the open water period.

scholarly journals Long-term analysis of River Tisza water level data with regard to the ecological water demand of floodplain water bodies

2021 ◽  
Vol 15 (1) ◽  
pp. 16-32
Author(s):  
György Dévai ◽  
Martina Gyöngy ◽  
Csaba Berta ◽  
Ferenc Bogár ◽  
Imre Bogár ◽  
...  
Keyword(s):  
Water Level ◽  
Water Demand ◽  
Ecological Status ◽  
Water Levels ◽  
Water Bodies ◽  
Water Volume ◽  
Data Series ◽  
Floodplain Wetlands ◽  
Ecological Water Demand

One of the main threats of our time is the increasing water demand not only globally, but also locally. These are often met at the expense of ecological water demand, jeopardizing the structural and operational conditions necessary to maintain good ecological status in aquatic and wetland habitats. This is why it is of great importance to explore possible water retention options. In 2019, based on the long-term data series on the water level of River Tisza, we studied the frequency and extent of flooding in the floodplain between Tiszabercel and Gávavencsellő, where there are valuable wetlands, including a ‘sanctuary’-type backwater. This was necessary because recently the floodplains have undergone negative changes. Their water volume has gradually decreased, their valuable wildlife has become rarer, some of them have completely dried out in the autumn and even one of them has burned out. From the analysis of the examined 48-years data, it could be concluded that flooding was relatively frequent in the sampled area, but the extent of water coverage had no significant effect either in space or time. It was also found that only water levels above 700 cm (based on the water meter of Tiszabercel, 98.36 mBf) could adequately ensure that the water bodies are filled up and flushed out. However, there is little chance of this, because of four reasons: (1) water levels of this height are becoming rare; (2) the duration and height of high water levels are mostly short in time; (3) water levels of several water bodies are artificially decreased; (4) the drainage effect of the River Tisza – which has been significantly incised after the river regulation – prevails in the area. Due to all, in the future, there would be a great need to maintain the water levels in the floodplain wetlands as efficiently as possible after the floods – for which we have made specific proposals for the places and methods to preserve the ecologically necessary amount of water.

scholarly journals The Effects of Supplemental Feeding and Fall Drawdowns on the Largemouth Bass and Bluegills at Ridge Lake, Illinois

1973 ◽  
Vol 31 (1-10) ◽  
pp. 1-28
Author(s):  
George William Bennett ◽  
H. Wickliffe Adkins ◽  
William F. Childers
Keyword(s):  
Water Level ◽  
Surface Area ◽  
Channel Catfish ◽  
Largemouth Bass ◽  
Water Levels ◽  
Small Fish ◽  
Supplemental Feeding ◽  
Fish Food ◽  
Program Cost ◽  
Pelleted Food

1.—After a draining census in 1963, Ridge Lake was restocked with 2,386 largemouth bass, 4,492 bluegills, 1,335 warmouths, 11 channel catfish, and 1,020 lake chubsuckers, making a total of 9,244 fishes weighing 510.6 kg (1,125.5 pounds). This was 78.8 kg per hectare, or 70.3 pounds per acre. In the census preceding this restocking this lake was found to contain 287 kg per hectare, or 256 pounds per acre, almost four times the weight of fish returned to the lake. In 1969, 2,000 additional channel catfish were stocked. 2.—The population of fishes was allowed to expand for two growing seasons (1963 and 1964) without drawdowns or supplemental feeding but with the usual controlled public fishing during the summer months. The hook-and-line catch in 1963 and 1964 was below the average for the preceding 20 years. 3.—Beginning in late May 1965, and continuing each year during the 3 summer months, 1965 through 1969, the fish were fed daily on a commercial pelleted fish food (32 percent protein) at the rate of 2 pounds per acre per day. Food was spread in the shallows in all parts of the lake. The food cost was within the range of $27.80-$30.12 per hectare per season ($11.25-$12.19 per acre per season). 4.—Each year, beginning in September 1965, the lake level was lowered: 4.6 meters (15 feet) in 1965, leaving a surface area of 2.12 ha 3.0 meters (10 feet) in 1966, leaving a surface area of 4.5 ha 3.0 meters (10 feet) in 1967, leaving a surface area of 4,5 ha 4.6 meters (15 feet) in 1968 leaving a surface area of 2,12 ha 4.3 meters (14 feet) in 1969, leaving a surface area of 2.76 ha The level was maintained until the water temperature in the lake was about 13° C, (57° F.) in October, when the lake was allowed to refill, 5,—In March 1970, the lake was drained to make a census of the fishes. The lake contained 2,420 bass, 9,546 bluegills, 556 warmouths, 1,477 channel catfish, 232 lake chubsuckers, and 3 fishes of other species, a total of 14,234 fishes weighing 1,440.0 kg (3,175.3 pounds). 6.—The catch of largemouth bass during the seasons 1965-1969, inclusive, was composed mostly of small fish. The f-d program resulted in the production of excessive numbers of small bass but generally did nothing to improve bass fishing. 7.—The fishermen's catch included more than twice as many large bluegills (152 mm or longer) as it did smaller ones during the 1965-1969 period. Blue gills of desirable sizes averaged 127 grams (0.28 pound) each. 8.—Neither warmouths nor channel catfish produced large hook-and-line yields because their numbers were always small. Channel catfish produced a small year class in 1963 or 1964, and this year class appeared in the catch in 1966-1969, inclusive. The catfish stocked in 1969 were too small to appear in the 1969 catch. 9.—During years when the water level in Ridge Lake remained fairly constant, bluegill numbers increased to 50,000 in one 2-year period and to 66,000 in another, to 86,000 in one 3-year period, and to 93,000 in a 4-year period. Annual fall drawdowns of 4.6 meters reduced the bluegill population to 7,500, those of 3.0 meters to 17,000 bluegills, and the 4.3- meter drawdown reduced the population to 9,500 bluegills. These drawdowns apparently had little effect on largemouth bass numbers. 10.—The average hook-and-line yield of bass in the 5 f-d years was only 18.0 kg per hectare (16.1 pounds per acre). This yield was below the average for 3 drawdown years (1952, 1954, and 1955) and 3 stable water level years (1957, 1958, and 1959). The average bluegill yield under the f-d program was 71.6 kg per hectare (63.9 pounds per acre), higher than the catch in any other period. 11 .—The average index of condition of largemouth bass in the f-d period was slightly below normal. Average bluegill condition was "fat" in June of all f-d years except 1965 and 1969. Usually the average bluegill index of condition was lower in July and August, which followed a previously observed condition cycle for that species. The condition of bluegills in 1954-1955 with fall drawdowns, but without supplemental feeding, was "fat" in June of 1954 but only reached "high average" plumpness for July and August of 1954 and for all of the summer of 1955. 12.—Largemouth bass growth was slower during the f-d period than during the period of biennial lake draining and culling of the fish population. Bluegills grew somewhat faster during the f-d period than they did during the program of drawdowns without feeding. They appeared to live longer during the f-d period and therefore attained larger sizes. They grew much faster under the f-d program than they did when water levels were stable. 13.—The pelleted food for the f-d program cost about 12 cents per acre per day, or about $11.25-$12.19 per acre per season. Fishermen were enthusiastic about the program because they were able to catch larger and fatter bluegills, and they believed that the pelleted food improved the flavor of these fish. Feeding bluegills without fall drawdowns would probably be wasteful because the bluegill population would expand faster than the food supply.  

AUTOMATIC WATER LEVEL MONITORING WITH IOT AND LPWAN

2019 ◽  
pp. 95-103
Author(s):  
Krum Videnov ◽  
Vanya Stoykova
Keyword(s):  
Water Level ◽  
Real Time ◽  
Early Warning ◽  
Water Sources ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Level Monitoring ◽  
Water Level Monitoring

Monitoring water levels of lakes, streams, rivers and other water basins is of essential importance and is a popular measurement for a number of different industries and organisations. Remote water level monitoring helps to provide an early warning feature by sending advance alerts when the water level is increased (reaches a certain threshold). The purpose of this report is to present an affordable solution for measuring water levels in water sources using IoT and LPWAN. The assembled system enables recording of water level fluctuations in real time and storing the collected data on a remote database through LoRaWAN for further processing and analysis.

Interaction between water pressure in the basal drainage system and discharge from an Alpine glacier before and during a rainfall-induced subglacial hydrological event

1997 ◽  
Vol 24 ◽  
pp. 288-292 ◽  
Author(s):  
Andrew P. Barrett ◽  
David N. Collins
Keyword(s):  
Water Level ◽  
Water Pressure ◽  
Drainage System ◽  
Water Levels ◽  
Drainage Network ◽  
Alpine Glacier ◽  
Hydraulic Conditions ◽  
Borehole Water ◽  
Progressive Growth ◽  
Resultant Increase

Combined measurements of meltwater discharge from the portal and of water level in a borehole drilled to the bed of Findelengletscher, Switzerland, were obtained during the later part of the 1993 ablation season. A severe storm, lasting from 22 through 24 September, produced at least 130 mm of precipitation over the glacier, largely as rain. The combined hydrological records indicate periods during which the basal drainage system became constricted and water storage in the glacier increased, as well as phases of channel growth. During the storm, water pressure generally increased as water backed up in the drainage network. Abrupt, temporary falls in borehole water level were accompanied by pulses in portal discharge. On 24 September, whilst borehole water level continued to rise, water started to escape under pressure with a resultant increase in discharge. As the drainage network expanded, a large amount of debris was flushed from a wide area of the bed. Progressive growth in channel capacity as discharge increased enabled stored water to drain and borehole water level to fall rapidly. Possible relationships between observed borehole water levels and water pressures in subglacial channels are influenced by hydraulic conditions at the base of the hole, distance between the hole and a channel, and the nature of the substrate.

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