The São Francisco floodplain project: determination of the floodplain terrain using water level data and multi-source satellite imagery

2018 ◽  
Author(s):  
Philippe Maillard ◽  
Évelyn M. Pôssa ◽  
Marília F. Gomes ◽  
Lília M. Oliveira ◽  
Ramille Araújo Soares de Paula ◽  
...  
Keyword(s):  
Water Level ◽  
Satellite Imagery ◽  
Level Data ◽  
Water Level Data

Determination of Survey Boat “Heave” Motion with the Use of RTS Technique

2017 ◽  
Author(s):  
Dariusz Popielarczyk
Keyword(s):  
Water Level ◽  
Vertical Movement ◽  
Bathymetric Survey ◽  
Total Station ◽  
Vistula River ◽  
Level Data ◽  
Water Level Data ◽  
Hydroacoustic Measurements ◽  
Heave Motion

The paper presents analysis of determination of vertical movement of the surveying boat called “heave” with the use of Robotized Total Station (RTS) technique. The classical geodetic Total Station was used for sub-centimeter calculation of water level changes during hydroacoustic measurements on the fragment of Vistula river behind the dam and hydropower in Włocławek in Poland. The power station work causes up to 1.7 m movement of vertical reference water surface in aspect of local bathymetric survey. The experimental, hydrographic surveys on the river were conducted where the water level was changing significantly over time depending on the operational schedule of the power plant. Verified hydrographic data had to be brought to the common water level. To determine the final water level, data on the height of the Robotized Total Station prism positioned on the boat during sounding was considered. The RTS technique with 0.02–0.05 m vertical accuracy proved to be very useful and essential in engineering inland bathymetric measurements.

scholarly journals A Contribution to the Analysis of Recovery Data for the Determination of the HydrauIic Properties of an Aquifer

1970 ◽  
Vol 37 ◽  
pp. 1-24
Author(s):  
Zvonimir Haman ◽  
Lars Jørgen Andersen
Keyword(s):  
Water Level ◽  
Hydraulic Properties ◽  
Pumping Test ◽  
Level Data ◽  
Water Level Data ◽  
Barometric Efficiency ◽  
Artesian Aquifer

The purpose of this paper is to present a more reliable calculation of hydraulic properties (T) and (S) utilizing recovery data instead of residual drawdown data. A useful formula for the computation of the recovery from the extrapolated drawdown is recommended. Practical data for this paper has been obtained from a pumping test in an artesian aquifer at Hvinningdal, Silkeborg, Denmark. The calculations are made by means of the nonequilibrium formulas of Theis and Jacob. In addition, the paper provides procedure and examples of adjustments of water-level data for barometric efficiency.

Predicting macrophyte states in a small temporarily open/closed estuary

2012 ◽  
Vol 63 (7) ◽  
pp. 616 ◽  
Author(s):  
T. Riddin ◽  
J. B. Adams
Keyword(s):  
Salt Marsh ◽  
Water Level ◽  
Submerged Macrophytes ◽  
High Water ◽  
Water Levels ◽  
Level Data ◽  
Water Level Data ◽  
Present Distribution ◽  
Macrophyte Habitats

Temporarily open/closed estuaries (TOCEs) shift between abiotic states associated with mouth status. The aim of this study was to assess whether macrophyte states could be identified based on the dominant cover abundance of different species representative of specific habitats. A 5-year dataset of monthly macrophyte cover was assessed for the East Kleinemonde Estuary in South Africa. Three macrophyte states were identified: namely open and tidal (predominantly intertidal salt marsh); closed and low water level (predominantly salt marsh); and closed and high water level (with submerged macrophytes). The threshold water level for the change from salt marsh to submerged macrophytes was 1.6 m above mean sea level (amsl). A fourth state where macroalgae were dominant was identified for high salinity conditions (above 30 PSU). It was then possible to examine simulated water level data for different inflow scenarios to determine how often these macrophyte states occurred. Available macrophyte habitat was also calculated for different water levels using a spatial model written in Modelbuilder (ArcGIS 9.3.1). Both methods used to predict available macrophyte habitats are rapid, requiring only information on the elevation range of the main habitats, as well as present distribution and bathymetric maps. These predictive techniques are useful in the determination of the ecological water requirements of small estuaries.

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