scholarly journals WATER LEVEL FLUCTUATIONS DETERMINE THE SPATIAL AND TEMPORAL DISTRIBUTION OF MANCHURIAN WILD RICE (ZIZANIA LATIFOLIA) IN SIX YANGTZE RIVER FLOODPLAIN LAKES, CHINA

2020 ◽  
Vol 18 (4) ◽  
pp. 5491-5503
Author(s):  
H.L. WANG ◽  
X.K. ZHANG ◽  
B.S. JIN ◽  
M.D. WANG ◽  
W.X. CHEN ◽  
...  
Keyword(s):  
Water Level ◽  
Wild Rice ◽  
Yangtze River ◽  
Temporal Distribution ◽  
Floodplain Lakes ◽  
Water Level Fluctuations ◽  
Spatial And Temporal Distribution ◽  
Zizania Latifolia ◽  
River Floodplain

scholarly journals Spatial and temporal distribution of ''curvina'' larvae (Plagioscion squamosissimus HECKEL, 1840) and its relationship to some environmental variables in the upper Paraná River floodplain, Brazil

2003 ◽  
Vol 63 (3) ◽  
pp. 381-391 ◽  
Author(s):  
M. S. T. Baumgartner ◽  
K. Nakatini ◽  
G. Baumgartner ◽  
M. C. Makrakis
Keyword(s):  
Water Level ◽  
Temporal Distribution ◽  
Paraná River ◽  
Spatial And Temporal Distribution ◽  
River Floodplain ◽  
Parana River ◽  
Upper Paraná River Floodplain ◽  
Upper Paraná River ◽  
Paraná River Floodplain ◽  
Spawning Sites

With the objective of studying the spatial and temporal distribution of ''curvina'' Plagioscion squamosissimus larvae and verifying respective spawning sites, monthly sampling was carried out from March 1993 to February 1994 on the Upper Paraná River floodplain. Using a conical-cylindrical plankton net (0.5 mm mesh), samples were taken from the surface of the water bodies, and in the marginal vegetation a strainer and a dragnet (''picaré'') were used. Water samples were collected for environmental variable analysis (temperature, dissolved oxygen, water pH, and electrical conductivity). Water level data were obtained from hydrometric stations. High average density of larvae was found from December 1993 to February 1994 due to high temperature and water level. The Baía sub-area was shown to be the most important in the larvae catch, probably due to its semi-lotic characteristics. Larvae size distribution was shown to be more frequent in the 4.0 mm standard length class, indicating that the sampling stations were next to the spawning sites.

scholarly journals A study on the characteristics and influencing factors of reservoir sedimentation in Wanjiazhai Reservoir

2018 ◽  
Vol 246 ◽  
pp. 01046
Author(s):  
Zhihui Ren ◽  
Ting Wang ◽  
Yuanjian Wang ◽  
Shaojun Qu
Keyword(s):  
Water Level ◽  
Reservoir Operation ◽  
Temporal Distribution ◽  
Measured Data ◽  
Sediment Deposition ◽  
Reservoir Sedimentation ◽  
Spatial And Temporal Distribution ◽  
Timely Manner ◽  
Reservoir Area ◽  
The Impact

Based on measured data of the Wanjiazhai Reservoir in different periods, the characteristics of the spatial and temporal distribution of sedimentation in the reservoir area were preliminarily analyzed and the impact of reservoir operation on this distribution was discussed. Primary conclusions are as followed: in terms of temporal distribution, sedimentation continuously accumulated over the period from 2000 to 2017, with the sediment deposition ratio dramatically decreasing between 2011 and 2017; in terms of spatial distribution, the sedimentation in the reservoir area was mainly concentrated downstream of the WD54 section, with the highest concentration being downstream of the WD23 section. The characteristics of sedimentation distribution in the reservoir area were closely related to inflow and sediment conditions and reservoir operation water level. When the water level was lower than 952 m, the sediment deposition ratio was lower than 0. To further improve the sediment deposition form in the reservoir area, lowering water level and ejecting the sediment are recommended in a timely manner.

Drivers of waterbird communities and their declines on Yangtze River floodplain lakes

2018 ◽  
Vol 218 ◽  
pp. 240-246 ◽  
Author(s):  
Qiang Jia ◽  
Xin Wang ◽  
Yong Zhang ◽  
Lei Cao ◽  
Anthony David Fox
Keyword(s):  
Yangtze River ◽  
Floodplain Lakes ◽  
River Floodplain

scholarly journals Annual Cycle Dampening and the Decrease Predictability of Water Level Fluctuations in a Dam-Regulated Neotropical Floodplain

2019 ◽  
Author(s):  
Jaques Everton Zanon
Keyword(s):  
Water Level ◽  
Annual Cycle ◽  
Flood Pulse ◽  
Paraná River ◽  
Transitional Period ◽  
Dynamical Analysis ◽  
Water Level Fluctuations ◽  
River Floodplain ◽  
Parana River ◽  
Upper Paraná River

AbstractThe flood pulse concept refers to seasonal variations in river water level and is the driving force in river-floodplain systems that ‘responsible for the existence, productivity and interactions’ of these system’s biota. This seasonal variation is inherent to river-floodplain systems and establishes a natural pattern of these ecosystems that has frequently been observed in nature. One particular river-floodplain system of interest is the Upper Parana River and its floodplain, whose upstream contains a reservoir cascade that caused profound alterations on its flooding regime by having diminished flood magnitude, but increased its frequency. In this study, I sought to explore the flood pulse condition in the Upper Paraná River Floodplain by using a set of state-of-the-art spectral and non-linear analyses and a time series of water level fluctuations (1968-2017) from this system. I divided the data into four periods: i) natural regime period, ii) transitional period, iii) dam cascade period, and iv) Primavera’s dam period. Spectral analysis demonstrated a decrease in the annual cycle amplitude, reflected in its power spectrum, which means a weakening in the difference between flood and drought events. Additionally, nonlinear dynamical analysis revealed a less deterministic and predicable behavior leading to more erratic fluctuations jeopardizing the temporal heterogeneity of that system.

scholarly journals Relationship between Observed Seismicity and Water Level Fluctuations in Polyphyto Dam Area (North Greece)

2019 ◽  
pp. 1-10 ◽  
Author(s):  
Kyriaki Pavlou
Keyword(s):  
Water Level ◽  
Seismic Activity ◽  
Temporal Distribution ◽  
Water Level Fluctuations ◽  
Remarkable Change ◽  
Distribution Maps ◽  
Artificial Lakes ◽  
Pressure Diffusion ◽  
Area North ◽  
Using Data

The spatial-temporal seismicity in Aliakmona river area is presented for the period 1974-2010 (NW Greece). This study area, which was classified as low seismicity, presents a particular interest due to the unexpected strong earthquake of Ms=6.6 which occurred between the cities of Kozani–Grevena, at a distance of 18 km from the southern edge of Polyphyto lake in 1995. According to [1], seismic hazard changes have been identified SE of the Polyphyto dam after the impoundment of the lakes. In this study, we examined the possible correlation between the impoundment and the water level fluctuations due to the three artificial lakes which are established in the region and the observed seismicity using data from the catalogues of the National Observatory of Athens (NOA) (see details for seismological data on Mc, RMS, etc. in [2,3]). For the latter purpose, spatial and temporal distribution maps were developed as  well  as  correlation  diagrams  between  water  level  variations  in  respect  to  monthly seismicity for distances 10 Km, 20 Km, 30 Km, 40 Km and 50 Km around the artificial lakes using the ESRI ArcMap 10 software.  A remarkable change is observed in seismic activity in the vicinity of reservoirs for the period commencing 10 years prior to the first filling in comparison with the period 10 years after. This increased seismicity is correlated to the daily rate of water level fluctuations (dh/dt) for the period 1984-2010 reveals the presence of mainly shallow seismic activity with focal depths of 0-5 km in a high percentage (67%). This protracted seismicity which is mainly located in the SW area of Polyphyto lake, has characteristics of the second type of induced seismicity according to Talwani [4], and seems to be controlled by the water level fluctuations of Polyphyto reservoir due to the mechanism of pore pressure diffusion.

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