Does distance between aquatic plant assemblages matter in defining similarity between them during high water-level periods?

2014 ◽  
Vol 19 (1) ◽  
pp. 37-45 ◽  
Author(s):  
José de Ribamar A. de Paiva ◽  
Lígia Q. Matias ◽  
Fernando R. Martins ◽  
Helena Becker
Keyword(s):  
Water Level ◽  
Aquatic Plant ◽  
High Water ◽  
High Water Level ◽  
Plant Assemblages

Numerical Simulation of Engineering Wave for Zhongzui Bay

2007 ◽  
Author(s):  
Xiejun Shu ◽  
Senhui Jiang ◽  
Ruijie Li
Keyword(s):  
Numerical Simulation ◽  
Water Level ◽  
Simulation Method ◽  
High Water ◽  
Wave Transformation ◽  
Return Periods ◽  
Engineering Construction ◽  
Wave Refraction ◽  
High Water Level ◽  
Mild Slope Equation

For providing a better shelter condition, it is necessary to build a breakwater in Zhongzui Bay. In order to know whether mooring area meets the requirement after engineering construction and compare the mooring area between solid breakwater and permeable breakwater, a numerical simulation method is used in the sheltering harbor of Zhongzui Bay. The used Mild-slope equation which describes wave refraction, diffraction and reflection, considers the steep slope bottom and effect of energy dissipation. It has been validated to fit for simulating wave transformation in the coastal zone. Under extreme high water level and design high water level, wave fields in the calculation area of three wave types in three different return periods are simulated by using this method respectively. In addition, wave height in front of breakwater can be provided. Then the wave parameters and the mooring area of two occasions, with and without breakwater, are gained in calculation area. Based on these results, some conclusions are presented in the end.

scholarly journals The influence of Three Gorges Reservoir high water level on the rainfall runoff

2018 ◽  
Vol 246 ◽  
pp. 01007
Author(s):  
Biqiong Wu ◽  
Wei Zheng ◽  
Xinkai Ren ◽  
Tao Xu ◽  
Xiao Guo
Keyword(s):  
Water Level ◽  
Three Gorges Reservoir ◽  
Reference Value ◽  
High Water ◽  
Three Gorges ◽  
Rainfall Runoff ◽  
Flood Peak ◽  
High Water Level ◽  
Three Gorges Region ◽  
Unit Hydrographs

After Three Gorges Reservoir building up, the natural river course and the near hillside inside the backwater region are inundated to form a fairly wide man-made lake which affects the hydrological characteristics and floodwater transmission to different degrees. When the reservoir impound to high water level, the conflux time is obviously shortened, the flood-peak discharge increase, and the peak type became sharper. The change of runoff yield and concentration makes the forecast scheme unable to be applied well. Based on the practice of Three Gorges Reservoir operation, the rainfall-runoff characteristics of the backwater region under the condition of high water level are analysed and summarized, then a set of unit hydrographs suitable for rainfall-runoff calculation are recalibrated, which has great reference value for hydrological forecasting of Three Gorges region.

Stromatolites from the Middle Old Red Sandstone of Western Orkney

1969 ◽  
Vol 106 (1) ◽  
pp. 77-88 ◽  
Author(s):  
N. G. T. Fannin
Keyword(s):  
Water Level ◽  
Algal Bloom ◽  
Granite Gneiss ◽  
High Water ◽  
Red Sandstone ◽  
High Water Level ◽  
Show Evidence

SUMMARYThe structures are comparable with stromatolites seen in modern “flats” environments and tufa occurring in joints in the granite—gneiss basement is compared with modern and fossil forms. Finely laminated (? varved) carbonates with a large lateral persistency (1: 50,000) are referred to periods of high water level and are believed to show evidence of seasonal algal bloom. The presence of widespread stromatolite structures is consistent with earlier environmental interpretations of the Orkney rocks.

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