Experimental Study on Zhenshui Sand Bar and its Treatment in Xiaolangdi Reservoir

2012 ◽  
Vol 204-208 ◽  
pp. 2318-2323
Author(s):  
Ting Wang ◽  
Jun Hua Zhang ◽  
Shu Kui Chen ◽  
Huai Bao Ma ◽  
Kun Peng Li
Keyword(s):  
Water Level ◽  
Storage Capacity ◽  
High Water ◽  
Experimental Result ◽  
Operational Mode ◽  
Small Reservoirs ◽  
Flood Season ◽  
Sand Bar ◽  
Xiaolangdi Reservoir

Zhenshui is the biggest tributary of Xiaolangdi Reservoir and its original storage capacity is 1.767 billion m3. By October 2010, the amount of sediment in Zhenshui reached 0.1691 billion m3, and the sand bar at Zhenshui estuary was 7m in height. Influenced by operational mode of reservoir and terrain, the formation of sand bar has certain inevitabilities. The sand bar can prevent water and sediment exchange between mainstream and tributary, and the internal storage capacity of tributary is not effectively used. The experimental result shows that during the later sediment retaining period, some small reservoirs can be built at the end of Zhenshui. By restoring water during the high water level in non-flood season in these small reservoirs and discharging flow during the low water level in flood season to scour sand bar, the tributary and main channel in Xiaolangdi Reservoir can be linked up in long term, service efficiency and life of tributary storage can be increased.

Deposition Morphology of Tributary Zhenshui in Xiaolangdi Reservoir

2014 ◽  
Vol 641-642 ◽  
pp. 145-148
Author(s):  
Ting Wang ◽  
Ying Ping Ma ◽  
Jun Hua Zhang ◽  
Huai Bao Ma ◽  
Wen Ling Fan Li
Keyword(s):  
Storage Capacity ◽  
Operational Mode ◽  
Water And Sediment ◽  
Internal Storage ◽  
Sand Bar ◽  
Xiaolangdi Reservoir ◽  
Deposition Morphology

Zhenshui is the biggest tributary of Xiaolangdi Reservoir, and its original storage capacity is 1.767 billion m3 and accounts for 33.5% of the tributary. By October 2013, the amount of sediment in Zhenshui reached 0.2365 billion m3, and the sand bar was 5.78m in height. Influenced by operational mode of reservoir and terrain, the formation of sand bar at Zhenshui estuary has certain inevitabilities. The sand bar can prevent water and sediment exchange between mainstream and tributary, and the internal storage capacity of tributary is not effectively used. Analyzing sand bar and its cause can supply some technical supports for prevention.

scholarly journals CHARACTERISTICS PHYSICAL PROPERTIES OF SOIL FOR CONSERVATION POND PLANNING IN KECAMATAN LIANG ANGGANG PEATLANDS

2017 ◽  
Vol 3 (3) ◽  
pp. 13-17
Author(s):  
Rusliansyah Rusliansyah ◽  
Rusdiansyah Rusdiansyah ◽  
Muhammad Afief Ma’ruf ◽  
Meilinda Ayunita Santoso
Keyword(s):  
Physical Properties ◽  
Water Level ◽  
Ecosystem Restoration ◽  
High Water ◽  
Land Conservation ◽  
Land Area ◽  
Fire Point ◽  
Main Factor ◽  
Properties Of Soil

Peatland fires in 2015 that hit 23 of 33 provinces in Indonesia is one of the worst fires in history. South Kalimantan is one of the 23 provinces with the burned land area of 19.179,9 hectares. Peatland burning in Banjarbaru and of Banjar Regency which totaled 1.536 fire point burning with a land area of approximately 1.500 hectares. The main factor of this land fires is of decreased water level in the peat land. Therefore, to overcome that fires will not happen again by creating a conservation pond to hold water, especially during the rainy season in order to keep moist peat.   The planning an peat land conservation in this area of 900 hectares. Peat ecosystem restoration can be done through the realignment of hydrological function where peat dome as a long-term water storage. The purpose of the research is to knowing the state of the physical properties soil for conservation pond made and knowing the condition of the ground water level in the field.  From the results of an investigation soil physical properties obtained peat has not undergone recast and the number of pores in the soil are very large so that the soil becomes porous with a high water level conditions.

scholarly journals Long-Term Productivity of Canvasbacks (Aythya Valisineria) in a Snowpack-Driven Desert Marsh

The Auk ◽  
2003 ◽  
Vol 120 (1) ◽  
pp. 107-119
Author(s):  
Kammie L. Kruse ◽  
James R. Lovvorn ◽  
John Y. Takekawa ◽  
Jeffrey Mackay
Keyword(s):  
Water Level ◽  
Nest Success ◽  
High Water ◽  
Breeding Population ◽  
Breeding Performance ◽  
Wetland Birds ◽  
Factors Affecting ◽  
Mammalian Predators ◽  
Aythya Valisineria

Abstract Ruby Lake, Nevada, is a large palustrine wetland that hosts the southern-most major breeding population of Canvasbacks (Aythya valisineria). That arid marsh, fed by springs derived from mountain snowpack, differs in climate and hydrology from glaciated potholes of the northern prairies where most Canvasbacks breed. Fourteen years of nesting data on Canvasbacks over a 31 year period (1970–2000) were analyzed to determine factors affecting breeding performance at Ruby Lake and whether they differed from those in the prairies. Long-term Mayfield nest success at Ruby Lake (50% of all nests) was in the range of that in the northern prairies (21–65%). Of all Canvasback nests, 73% were parasitized (mostly by Redheads [Aythya americana]) as compared to 83–97% in a large Manitoba marsh and 57–65% in Manitoba potholes. However, as in the northern prairies, nest parasitism generally had little or no effect on either nest success or percentage of host eggs that hatched. In Manitoba potholes, nest success was unrelated to habitat variables measured; but successful nests at Ruby Lake were over shallower water, farther from shore, in wider bands of emergent vegetation, and surrounded by lower stem densities than unsuccessful nests. Water level is the key factor in breeding performance of Canvasbacks at both Ruby Lake and the northern prairies; however, the source of water differs (mountain snowpack at Ruby Lake, direct precipitation in the prairies) and effects of water-level variations are reversed. In small prairie potholes (mostly <0.4 ha) with many mammalian predators, productivity of Canvasbacks (which build floating nests) is increased by high water that floods the emergent fringe. At Ruby Lake, a very large marsh (2,830 ha) with mostly avian predators, Canvasback productivity is decreased by high water that floods interior emergent stands too deeply. Water level at Ruby Lake was highly correlated (multiple R2 = 0.91) with mountain snowpack up to three years earlier, emphasizing the strong effect of climatic variations on wetland birds in that arid region.

Study on Evolvement of High Beach and Deep Channel of Reservoir in the Sediment-Laden Rivers

2014 ◽  
Vol 641-642 ◽  
pp. 205-208
Author(s):  
Kun Peng Li ◽  
Jun Hua Zhang ◽  
Huai Bao Ma ◽  
Guo Ming Gao ◽  
Wen Ling Fan
Keyword(s):  
Deposition Process ◽  
Physical Model Test ◽  
Operational Mode ◽  
Concentrated Flow ◽  
Deep Channel ◽  
Flood Period ◽  
Sand Bar ◽  
Sanmenxia Reservoir ◽  
Topographic Condition ◽  
Xiaolangdi Reservoir

According to datas of Sanmenxia Reservoir and physical model test of Xiaolangdi Reservoir during later sediment retaining period, the paper study evolvement of high beach and deep channel of reservoir in the sediment-laden rivers. The results show that: 1The evolution of high beach and deep channel is as follows, firstly, beach and channel increase synchronously , and then scour happens in channel. Channel scour and scour amount is crucial to form high beach and deep channel. 2It is found that tributaries were equivalent to the horizontal extension of mainstream riverbed. The deposition process of tributary is closely related to many factors of natural topographic condition, deposition morphology of mainstream at the confluence area of mainstream and tributary and so on. The cross-section of tributary kept uplift horizontally, and sand bar has formed in some tributary estuary. 3Rainfall erosion formed in flood period is beneficial to forming hyper-concentrated flow, to a certain extent; it can recover channel storage capacity, and play an important role on utilizing long-term comprehensive benefits. Studying evolvement of high beach and deep channel can supply some technical supports for regulating operational mode of Xiaolangdi Reservoir during later sediment retaining period and prolonging service life.

An Experimental Study on the Performance of Wave Dissipation of Artificial Sand Bar

2012 ◽  
Vol 226-228 ◽  
pp. 2299-2302
Author(s):  
Duo Cang Zhao ◽  
Bing Shi ◽  
Li Peng Yang ◽  
Zhi Yong Zhang
Keyword(s):  
Experimental Study ◽  
Water Level ◽  
Transmission Coefficient ◽  
Wave Height ◽  
High Water ◽  
Wave Parameter ◽  
Regular Waves ◽  
Wave Dissipation ◽  
High Water Level ◽  
Sand Bar

The paper summarizes the results of the performance of wave dissipation of an artificial sand bar experimental study under regular waves .In the experiment, the water levers are 0.00m、design high water level (1.35m) and extreme high water level (2.66m) ,it chooses the corresponding the limit wave height of three kinds of water level ,and analyzes the influences of relative height of artificial sand bar (d/H)、relative water depth of artificial sand bar (R/H) and wave steepness (H/L) on transmission coefficient of wave.The result shows that artificial sand bar has well the performance of consuming wave energy, the incident wave height starts up clearly decrease, while wave passes through artificial sand bar.With changing in conditions of artificial sand bar geometric dimensioning and wave parameter, transmission coefficient of regular waves also Changes.

scholarly journals Macrophytes in the littoral of Lake Arakhley in different states of water regime

2019 ◽  
Vol 38 (3) ◽  
pp. 225-239
Author(s):  
Alexey P. Kuklin ◽  
Balzhit B. Bazarova
Keyword(s):  
Water Content ◽  
Water Level ◽  
Mixed Type ◽  
Water Regime ◽  
Aquatic Vegetation ◽  
High Water ◽  
Sand Beach ◽  
Climate Fluctuations ◽  
High Water Period

AbstractThe study of aquatic vegetation in the littoral of the dimictic water bodies of taiga is of particular interest in case of long-term observations carried out under conditions of climate fluctuations. During the low-water period, drying of the littoral with a decrease in the water level leads to the changes in phytomass of macrophytes, as well as in the composition of species and their distribution by depth. The area of littoral covered with ice in winter is also large in the low-water period; it affects the growth of perennial plants. When the water level decreases, the sand beach replaces the sand and pebble beach; it leads to the disappearance of epilithon and the predominance of rooting plants. The features of vegetation were determined for each period of water content. The low-water period is characterised mostly by grass-type vegetation; the high-water period is characterised by vegetation of mixed type.

Isolation and water-level fluctuations of Lake Kachishayoot, Northern Québec, Canada

2003 ◽  
Vol 60 (2) ◽  
pp. 149-161 ◽  
Author(s):  
Luc Miousse ◽  
Najat Bhiry ◽  
Martin Lavoie
Keyword(s):  
Water Level ◽  
High Water ◽  
Water Level Fluctuations ◽  
Laurentide Ice Sheet ◽  
Northeastern United States ◽  
Lacustrine Environment ◽  
East Central ◽  
Central Canada ◽  
Pollen Analyses

AbstractThis study combines different methods, including grain size, macrofossil, and pollen analyses, to reconstruct paleogeographical and paleoclimatological conditions for periods before, during, and after the isolation of a small lake (Lake Kachishayoot) in northern Québec. After the retreat of the Laurentide Ice Sheet around 800014C yr B.P., the area was submerged by the Tyrrell Sea. The transition from marine to lacustrine environment occurred about 5400 yr B.P. Two major periods of water-level fluctuations were inferred from organic and mineral sediments: a high water level that occurred after 3200 yr B.P. and a low water level that started before 2200 yr B.P. Our chronological data for the first period are consistent with those from nearby Lac des Pluviers and from other lakes in east central Canada and in the northeastern United States. During the low-water-level period, however, there is no evidence for minor fluctuations, whereas other lakes in northern Québec and east-central Canada underwent several brief lowerings. Long-term changes in atmospheric circulation caused by changing global boundary conditions likely explained long-term water-level fluctuations of Lake Kachishayoot.

scholarly journals Dynamics of plankton biocenoses under water level fluctuations in steppe lakes

2022 ◽  
Vol 962 (1) ◽  
pp. 012002
Author(s):  
E Yu Afonina ◽  
N A Tashlykova
Keyword(s):  
Water Level ◽  
Green Algae ◽  
Hydrological Regime ◽  
Steppe Zone ◽  
High Water ◽  
Water Level Fluctuations ◽  
Water Level Variation ◽  
Arid Steppe ◽  
Filling Phase

Abstract Barun-Torey and Zun-Torey lakes are located in the arid steppe zone of the Central (Inner) Asia, Eastern Siberia, Russia. The Torey lakes are characterizes unstable hydrological regime. The water level variation is explained by the periodic filling and drying of the lakes due to cyclical climatic changes in humidity and temperature. We conducted our studies various water level phases of the climatic cycle: from high water level (1999, 2003) to drying out and the initial filling phase (2007, 2011, 2014, 2016, 2018, and 2020). The aim of this paper is to present long-term research results on changes in the plankton biocenoses of the Torey lakes during a climate cycle, the drying and initial filling of basins. Succession of plankton dominant species is in the direction of: diatoms+green algae and rotifers+crustaceans → green algae and crustaceans → green algae+cyanobacteria and crustaceans → no planktonic algae and invertebrates → cyanobacteria+diatoms+green algae and rotifers+cladocerans+copepods.

Effect of sleep on memory for binding different types of visual information

2020 ◽  
Author(s):  
John J Shaw ◽  
Zhisen Urgolites ◽  
Padraic Monaghan
Keyword(s):  
Visual Information ◽  
Storage Capacity ◽  
Declarative Memory ◽  
Recognition Task ◽  
Forced Choice ◽  
Long Term Memory ◽  
Term Memory ◽  
Different Types ◽  
Types Of Information

Visual long-term memory has a large and detailed storage capacity for individual scenes, objects, and actions. However, memory for combinations of actions and scenes is poorer, suggesting difficulty in binding this information together. Sleep can enhance declarative memory of information, but whether sleep can also boost memory for binding information and whether the effect is general across different types of information is not yet known. Experiments 1 to 3 tested effects of sleep on binding actions and scenes, and Experiments 4 and 5 tested binding of objects and scenes. Participants viewed composites and were tested 12-hours later after a delay consisting of sleep (9pm-9am) or wake (9am-9pm), on an alternative forced choice recognition task. For action-scene composites, memory was relatively poor with no significant effect of sleep. For object-scene composites sleep did improve memory. Sleep can promote binding in memory, depending on the type of information to be combined.

scholarly journals Assessing Stream-Aquifer Connectivity in a Coastal California Watershed

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 416
Author(s):  
Bwalya Malama ◽  
Devin Pritchard-Peterson ◽  
John J. Jasbinsek ◽  
Christopher Surfleet
Keyword(s):  
Time Series ◽  
Spectral Analysis ◽  
Water Level ◽  
Time Series Data ◽  
Series Data ◽  
Low Permeability ◽  
Pumping Tests ◽  
Stream Flows ◽  
The Impact

We report the results of field and laboratory investigations of stream-aquifer interactions in a watershed along the California coast to assess the impact of groundwater pumping for irrigation on stream flows. The methods used include subsurface sediment sampling using direct-push drilling, laboratory permeability and particle size analyses of sediment, piezometer installation and instrumentation, stream discharge and stage monitoring, pumping tests for aquifer characterization, resistivity surveys, and long-term passive monitoring of stream stage and groundwater levels. Spectral analysis of long-term water level data was used to assess correlation between stream and groundwater level time series data. The investigations revealed the presence of a thin low permeability silt-clay aquitard unit between the main aquifer and the stream. This suggested a three layer conceptual model of the subsurface comprising unconfined and confined aquifers separated by an aquitard layer. This was broadly confirmed by resistivity surveys and pumping tests, the latter of which indicated the occurrence of leakage across the aquitard. The aquitard was determined to be 2–3 orders of magnitude less permeable than the aquifer, which is indicative of weak stream-aquifer connectivity and was confirmed by spectral analysis of stream-aquifer water level time series. The results illustrate the importance of site-specific investigations and suggest that even in systems where the stream is not in direct hydraulic contact with the producing aquifer, long-term stream depletion can occur due to leakage across low permeability units. This has implications for management of stream flows, groundwater abstraction, and water resources management during prolonged periods of drought.

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