Modelling the long-term sediment trap efficiency of small ponds

2001 ◽  
Vol 15 (14) ◽  
pp. 2797-2819 ◽  
Author(s):  
Gert Verstraeten ◽  
Jean Poesen
Keyword(s):  
Sediment Trap ◽  
Trap Efficiency

scholarly journals Sediment Budget and Sediment Trap efficiency of Baglihar Hydroelectric project Reservoir – a calibrated model for prediction of longevity of the Dam

2021 ◽  
Vol 38 (1) ◽  
pp. 65-74
Author(s):  
Romesh Kumar ◽  
AHSAN UL HAQ ◽  
G M Bhat ◽  
Yudhbir Singh ◽  
Javid Ahmed Dar
Keyword(s):  
Sediment Trap ◽  
Empirical Relationship ◽  
Field Investigation ◽  
Sediment Budget ◽  
Hydropower Project ◽  
Trap Efficiency ◽  
Hydroelectric Project ◽  
Reservoir Volume ◽  
Total Sediment

 The field investigation of the reservoir area of Baglihar Hydropower project shows that the sediment budget to the reservoir is controlled by fragile rock type like shales, sandstones, phyllites and slates, soil characteristics, steep hill slopes, rainfall and landslides. The rocks are highly weathered, fissile and micaceous in nature and very sensitive to water absorption.  The analysed sediments are characterised by dominance of sands, silts and clays with lower values of plasticity (14.3PL), liquidity (23.5 LL), cohesion (118) and shear strength (202 Kpa). The slope wash deposits are highly susceptible to landslides and slope failures and directly contribute to the sediment budget in the reservoir. In addition tributaries of Chenab River also bring sediments in the reservoir from the catchment area. The empirical relationship for estimating the long-term reservoir trap efficiency for large storage based on correlation between the relative reservoir size and trap efficiency was simulated in 3D model which shows that the annual sediment trap efficiency of the Baglihar reservoir is of 0.39%. The extrapolation of the calculated values shows that the total sediment load shall increase by 11% in the next 30 years and 20% in the next 50 years and correspondingly 40% in the next 100 years that shall induce corresponding decrease in the reservoir volume over the time.  By applying flushing schemes, life span of the reservoir can be extended. It is estimated that after 100 years the reservoir shall lose ~35.6% storage volume. On further extrapolation, the trap efficiency will decrease from 25.5% after 30 years to 23% after 100 years. The estimated trap efficiency of Baglihar reservoir is 60%, which is greater than that based on numerical results, showing a significant overestimation.

Paleomagnetic Analysis Of A Long-Term Sediment Trap, Kooken Cave, Huntingdon County, Pennsylvania, USA

2007 ◽  
pp. 71-81 ◽  
Author(s):  
Ira. D. Sasowsky ◽  
Rebecca A. Clotts ◽  
Bryan Crowell ◽  
Selena M. Walko ◽  
Edward J. LaRock ◽  
...  
Keyword(s):  
Sediment Trap

scholarly journals Evaluation of Long-Term Mark-Recapture Data for Estimating Abundance of Juvenile Fall-Run Chinook Salmon on the Stanislaus River from 1996 to 2017

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Tyler Pilger ◽  
Matthew Peterson ◽  
Dana Lee ◽  
Andrea Fuller ◽  
Doug Demko
Keyword(s):  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Estimation Method ◽  
Central Valley ◽  
Mark Recapture ◽  
Important Species ◽  
Trap Efficiency ◽  
Monitoring Programs ◽  
Abundance Estimates

Conservation and management of culturally and economically important species rely on monitoring programs to provide accurate and robust estimates of population size. Rotary screw traps (RSTs) are often used to monitor populations of anadromous fish, including fall-run Chinook Salmon (Oncorhynchus tshawytscha) in California’s Central Valley. Abundance estimates from RST data depend on estimating a trap's efficiency via mark-recapture releases. Because efficiency estimates are highly variable and influenced by many factors, abundance estimates can be highly uncertain. An additional complication is the multiple accepted methods for how to apply a limited number of trap efficiency estimates, each from discrete time-periods, to a population’s downstream migration, which can span months. Yet, few studies have evaluated these different methods, particularly with long-term monitoring programs. We used 21 years of mark-recapture data and RST catch of juvenile fall-run Chinook Salmon on the Stanislaus River, California, to investigate factors associated with trap efficiency variability across years and mark-recapture releases. We compared annual abundance estimates across five methods that differed in treatment of trap efficiency (stratified versus modeled) and statistical approach (frequentist versus Bayesian) to assess the variability of estimates across methods, and to evaluate whether method affected trends in estimated abundance. Consistent with short-term studies, we observed negative associations between estimated trap efficiency and river discharge as well as fish size. Abundance estimates were robust across all methods, frequently having overlapping confidence intervals. Abundance trends, for the number of increases and decreases from year to year, did not differ across methods. Estimated juvenile abundances were significantly related to adult escapement counts, and the relationship did not depend on estimation method. Understanding the sources of uncertainty related to abundance estimates is necessary to ensure that high-quality estimates are used in life cycle and stock-recruitment modeling.

scholarly journals Long-Term Changes of Particle Flux in the Canary Basin Between 1991 and 2009 and Comparison to Sediment Trap Records Off Mauritania

2020 ◽  
Vol 8 ◽  
Author(s):  
Gerhard Fischer ◽  
Susanne Neuer ◽  
Simon Ramondenc ◽  
Thomas J. Müller ◽  
Barbara Donner ◽  
...  
Keyword(s):  
Sediment Trap ◽  
Particle Flux ◽  
Long Term Changes

scholarly journals Experimental Investigation of Sediment Trap Efficiency in Reservoirs

2014 ◽  
Vol 47 (2) ◽  
pp. 1
Author(s):  
N. M. T. K. Revel ◽  
L. P. G. R. Ranasiri ◽  
R. M. C. R. K. Rathnayake ◽  
K. P. P. Pathirana
Keyword(s):  
Experimental Investigation ◽  
Sediment Trap ◽  
Trap Efficiency
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