scholarly journals Rapid River Bed Recovery after the In-Channel Mining: The Case of Vistula River, Poland

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 623
Author(s):  
Tadeusz Molenda ◽  
Agnieszka Czajka ◽  
Stanisław Czaja ◽  
Barbara Spyt
Keyword(s):  
Mining Area ◽  
Negative Influence ◽  
Vistula River ◽  
River Bed ◽  
Natural Flow ◽  
Average Water ◽  
River Reach ◽  
Bedload Sediment ◽  
Bed Material ◽  
Short Time

The effects of in-channel wet-pit mining is nowadays widely discussed in terms of negative influence of the created pits on the river ecosystem and fluvial processes. The pits induce an alteration of natural flow or sediment transport. This paper describes the post-mining channel recovery observed in a relatively short time in a gravelly sand bed lowland river. The study was based on repeated bathymetry of the channel and grain size analyses of bed material taken from the mining area and its surrounding upstream and downstream pit. We also use calculations of possible bedload sediment movement in the studied river reach. We noticed that the excavation pit exceeded the maximum depth of 8.8 m in 2014 and, immediately after the end of mining, the bedload started to infill the pit. The bathymetric measurements in 2019 indicated that the process of pit infill was completed after five years, though the former pit is refilled with material finer than the natural bedload observed in the discussed river reach, and consists mainly of sand. The studied process of pit infilling runs continuously, even during the annual average water stages.

Study on the interference of pier on the channel bed

2021 ◽  
pp. 278-284
Author(s):  
Atul Kumar Rahul ◽  
Akash Priyadarshee ◽  
Prabhat Kumar Singh ◽  
Shyam Bihari Dwivedi
Keyword(s):  
Laboratory Tests ◽  
The Other ◽  
Straight Channel ◽  
Sand Mining ◽  
Continuous Processes ◽  
River Bed ◽  
Natural Flow ◽  
Scouring Process ◽  
Study Laboratory ◽  
The Impact

Scoring and sedimentation are two continuous processes which take place in river bed. These two phenomena have significant impact over the overall behavior of river. Scoring and sedimentation process get affected due the construction of structures like Bridges. Piers of bridge alter the natural flow of rivers. Due to this scouring process increases near to the pier. The scouring process gets affected due to the other activities like sand mining or filling. Also any obstruction like some construction can also affect the scouring. In this study laboratory tests were conducted to understand the nature of scouring near to the pier. For this purpose, model test were conducted in a straight channel with a model concrete pier. The impact of the obstruction in flow, mining of sand and filling of the sand is investigated through this investigation. The finding of this study can be utilized in understanding and development of techniques of controlling scouring near the pier

scholarly journals Changes in Morphology of Selected Segments of the Vistula River Bed

2010 ◽  
Vol 14 (1) ◽  
pp. 193-202
Author(s):  
Małgorzata Bogucka-Szymalska
Keyword(s):  
Surface Area ◽  
River Regulation ◽  
Topographic Maps ◽  
Water Reservoirs ◽  
Vistula River ◽  
River Bed ◽  
Bed Forms ◽  
Bed Changes

Abstract The paper presents a reconstruction and an analysis of the Vistula river bed changes in the 19th and 20th centuries, performed on the basis of topographic maps. The analysis took into account both natural (floods, changes in rock-debris supply) and anthropogenic (e.g., river regulation, construction of water reservoirs) causes, which resulted in significant changes of the morphology of the Vistula river bed. To estimate the river bed changes the author used such parameters as: the length of the banks and changes of their location, the width of the river bed, and the surface of the river bed forms and their share in the river bed surface area.

scholarly journals Grain sorting in the morphological active layer of a braided river physical model

2015 ◽  
Vol 3 (4) ◽  
pp. 577-585 ◽  
Author(s):  
P. Leduc ◽  
P. Ashmore ◽  
J. T. Gardner
Keyword(s):  
Grain Size ◽  
Numerical Modeling ◽  
Active Layer ◽  
Bedload Transport ◽  
Scale Model ◽  
Active Layer Thickness ◽  
Braided River ◽  
River Bed ◽  
Physical Scale ◽  
Bed Material

Abstract. A physical scale model of a gravel-bed braided river was used to measure vertical grain size sorting in the morphological active layer aggregated over the width of the river. This vertical sorting is important for analyzing braided river sedimentology, for numerical modeling of braided river morphodynamics, and for measuring and predicting bedload transport rate. We define the morphological active layer as the bed material between the maximum and minimum bed elevations at a point over extended time periods sufficient for braiding processes to rework the river bed. The vertical extent of the active layer was measured using 40 hourly high-resolution DEMs (digital elevation models) of the model river bed. An image texture algorithm was used to map bed material grain size of each DEM. Analysis of the 40 DEMs and texture maps provides data on the geometry of the morphological active layer and variation in grain size in three dimensions. By normalizing active layer thickness and dividing into 10 sublayers, we show that all grain sizes occur with almost equal frequency in all sublayers. Occurrence of patches and strings of coarser (or finer) material relates to preservation of particular morpho-textural features within the active layer. For numerical modeling and bedload prediction, a morphological active layer that is fully mixed with respect to grain size is a reliable approximation.

From picture to porosity of river bed material using Structure-from-Motion with Multi-View-Stereo

Geomorphology ◽  
2018 ◽  
Vol 306 ◽  
pp. 80-89 ◽  
Author(s):  
Lydia Seitz ◽  
Christian Haas ◽  
Markus Noack ◽  
Silke Wieprecht
Keyword(s):  
Structure From Motion ◽  
River Bed ◽  
Bed Material

scholarly journals Morphodynamic effects of stone and wooden groynes in a restored river reach

2018 ◽  
Vol 40 ◽  
pp. 02038
Author(s):  
Bahaeldeen Zaid ◽  
Paride Nardone ◽  
Michael Nones ◽  
Christoph Gerstgraser ◽  
Katinka Koll
Keyword(s):  
Morphological Structure ◽  
Normal Flow ◽  
Flow Conditions ◽  
Bed Topography ◽  
Different Types ◽  
Fish Spawning ◽  
River Reach ◽  
Bed Material ◽  
Spree River ◽  
Flow Velocities

Restoration works on an 11 km long reach of the Spree River near Cottbus in Germany were accomplished in 2014. The overall objective was to improve the biodiversity, changing the morphological structure from a straight single-thread river to a braiding one with reshaped thalweg, and creating zones with varying flow velocities required for fish spawning. Several interventions were made, among which also two types of groynes were constructed along the reach: impermeable stone groynes, with an inclined crest so that only the tip is typically submerged during normal flow conditions, and wooden groynes made of several large trunks, which are mainly submerged at normal flow conditions. To compare local morphodynamic effects caused by the different types, flow velocities and bed topography were measured at distances of 12 m upstream and 16 m downstream of two selected groynes. The vertical profile was captured by measuring at five levels above the bed. Bed material was sampled at several locations around the groynes. The analysis of the measurements showed the effect of each groyne type on the flow velocity, bed topography and bed material. Furthermore, the differences in the effects of each groyne type on the flow, bed topography and bed material were highlighted.

Effects of large-scale rubber farm on soil erosion and river bed material in the upper Mekong Basin

2014 ◽  
pp. 2305-2312
Author(s):  
Xiongdong Zhou ◽  
Zhaoyin Wang ◽  
Bofu Yu ◽  
Lydia Seitz
Keyword(s):  
Soil Erosion ◽  
Large Scale ◽  
Mekong Basin ◽  
River Bed ◽  
Bed Material
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