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Low cohesion and poor scour resistance make sandy bank slopes in the lower reaches of rivers susceptible to instability and damage. Soil stabilization is one of ecological flexible bank protection technologies, which not only pays attention to the function of flood control, but also pays attention to the function of ecological and environmental protection. This study conducts a series of mechanical property test, nuclear magnetic resonance test (NMR), computed tomography test (CT), and scanning electron microscope test (SEM) on hydrogel-stabilized sand to highlight the link between pore-scale and macroscopic properties. The results of the mechanical tests indicate a linear increase in unconfined compressive strength, flexural strength, tensile strength, and cohesion with increasing hydrogel content. Conversely, the internal friction angle appears to be less impacted by fluctuations in hydrogel content. The specimen with 1 % hydrogel content exhibited a multi-peak T2 curve, and the specimens with 2 %, 3 %, and 4 % hydrogel contents share a similar three-peak spectrum shape. The start-end relaxation times, peak widths, and amplitudes of peaks decreased with the increase in hydrogel content. As the hydrogel content increased, there was a progressive increase in accumulated porosity, ranging from 1.0 % to 3.5 %. As the hydrogel content increased, the volume occupied by the hydrogel increased, and the spatial distribution of the hydrogel became more homogeneous as the hydrogel content increased and more hydrogel-sand aggregates formed. The number, length, and width of cracks decreased significantly and accordingly.

期刊论文 2025-01-24 DOI: 10.1016/j.conbuildmat.2025.139900 ISSN: 0950-0618

This study investigated an effective protection strategy for the intermediate period of the bioprotection technique using the jute rope grid. This paper presents the results and interpretation of the experimental study of a model river bank subjected to failure under sudden drawdown conditions and its response after protection with the jute rope grid under the geo-fluvial condition. The model bank was composed of silty clay soil collected from Parlalpur ferry ghat on the left bank of river Ganga, Malda district, West Bengal, India. In this experimental study model, the model river bank with a slope of 1 V:1.5H was prepared in the laboratory considering a linear scale of 1:25 to simulate a prototype river bank in the upper reach of river Ganga in West Bengal, India. The first series of experiments examined the impacts of maximum flood duration, moisture content, and drawdown on the shifting of failure location at the most damaged of the river bank. The second series of experiments were performed for the model river bank protected with a jute rope grid of various mesh grid areas. At critical geo-fluvial conditions, the effect of the jute rope grid having different mesh grid sizes was investigated to improve failure location and reduce settlement depth at the most damaged of the river. This study showed a reduction in the damaged area of the bank from 57.8 to 16.7% and 94.8% reduction of settlement employing the optimum jute mesh grid area of 6.25 cm2.

期刊论文 2024-12-01 DOI: 10.1007/s40098-023-00851-z ISSN: 0971-9555

The erosion of riverbanks is a significant and capricious national concern. The Al Muwahada channel in Iraq experiences instability in its banks, resulting in failure, retreat, and morphological alterations. These issues are mostly caused by factors such as the velocity of the flow, the angle of the slope, and type of soil. This study investigated the behavior of canal bank soil in response to erosion and variations in slope angle. Therefore, a physical model of a case study was established in the laboratory. Additionally, a slope angle of 26 & ring; is being utilized, which has not been previously studied in the laboratory. This angle will be tested with five different velocity values: 0.101 m/s, 0.116 m/s, 0.12 m/s, 0.13 m/s, and 0.135 m/s. The bank's deformation was measured for a period of 12 hours, which was divided into 4 equal intervals for each velocity. The study determined that a riverbank with a slope of 26 & ring; is more resistant to erosion when the velocity of the water is below 0.12 m/s. Velocities equal to or greater than 0.12 m/s have a substantial impact on the erosion of the riverbed. According to this study, a velocity of 0.12 m/s or higher leads to increased erosion of the riverbank. This is equivalent to a velocity of 0.804 m/s in the prototype channel. The of the riverbank that has suffered the greatest damage due to erosion is the upper two-thirds. The used methodology supports global efforts to increase information about the behavior of river banks with unexplored rivers that have different flow velocities and bank slope angles.

期刊论文 2024-08-01 DOI: 10.28991/CEJ-2024-010-08-013 ISSN: 2676-6957

River bank erosion supplies sediments to river systems, sustaining many river functions. To properly understand and ultimately model river bank erosion, we have to know the temporal and spatial distributions at which it occurs. This is especially challenging in cold-climate regions where a large variety of processes occur that contribute to river bank erosion. We therefore obtained a one-year dataset, using buried soil sensors, on bank erosion and its forcing parameters with a high temporal resolution to answer the question: what are the temporal and spatial distributions of river bank erosion in cold climate regions and what are the forcing conditions causing these distributions? We measured soil movements at multiple river bank sites throughout Finland and compared the movement times with soil moisture, soil and air temperature and discharge information. This analysis showed that there is no clear temporal distribution of bank movement in the Southernmost investigated site, while in the more Northern field sites soil movement was most frequent around the freezing and thawing periods. At one field site an additional period with an increased frequency of soil movement events is likely caused by reindeer during summer months. This research used a new type of dataset of soil temperature, moisture and movement. This unique dataset allowed us to identify individual soil movement events and helps to better understand river bank erosion and by extension fluvial systems in cold-climates.

期刊论文 2024-06-01 DOI: 10.1016/j.geomorph.2024.109140 ISSN: 0169-555X
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