scholarly journals Fine Sediment Deposition at Forest Road Crossings: An Overview and Effective Monitoring Protocol

10.5772/24275 ◽  
2011 ◽  
Author(s):  
John F. ◽  
Ellen L.
Keyword(s):  
Fine Sediment ◽  
Sediment Deposition ◽  
Forest Road ◽  
Monitoring Protocol

Is fine sediment deposition a main driver for the composition of benthic macroinvertebrate assemblages?

2013 ◽  
Vol 24 ◽  
pp. 589-598 ◽  
Author(s):  
Marta Gerta Von Bertrab ◽  
Andreas Krein ◽  
Sonja Stendera ◽  
Frankie Thielen ◽  
Daniel Hering
Keyword(s):  
Fine Sediment ◽  
Sediment Deposition ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Assemblages ◽  
Main Driver

Analysis of Application of Sediment Trap in Rivers as An Effort Reservoir Sedimentation Control

2021 ◽  
Vol 26 (2) ◽  
pp. 229-236
Author(s):  
Dyah Ari Wulandari ◽  
Desyta Ulfiana ◽  
Priyo Nugroho Parmantoro
Keyword(s):  
Sediment Trap ◽  
Sediment Load ◽  
Sediment Traps ◽  
Fine Sediment ◽  
Sediment Deposition ◽  
Reservoir Sedimentation ◽  
Check Dam ◽  
Fine Sediments ◽  
Irrigation Channels ◽  
Selection Of

Reservoir sedimentation can be overcome by reducing the amount of sediment that enters the reservoir, by building check dam. The check dam has more deposited coarse sediment load than fine sediment load. Fine sediment that escapes the check dam will flow further and eventually enter the reservoir pond. Therefore it is necessary to build a building that can capture fine sediments. Construction is planned as a system of sediment trap in irrigation channels. The purpose of this study is to analyze the possibility of applying the sediment trap in the river to deposit sediments that escape the check dam. The analysis begins with the selection of the location of the sediment trap, then calculate the dimensions of the sediment trap and the amount of sediment that has settled. Based on the analysis of the selected dimensions with several combinations of gradation of sediment grains, sediment deposition that occurs ranges from 42 - 68%. So it can be concluded making the sediment trap in the river can be done. However, for the application of these sediment traps further research is needed regarding the dimensions of sediment traps that are most optimal for sediment deposition.

scholarly journals Quantifying ecological effects of sedimentation in streams in differing land use management zones

2021 ◽  
Author(s):  
◽  
Debbie Mair
Keyword(s):  
Land Use ◽  
Fine Sediment ◽  
Sediment Deposition ◽  
Stream Habitat ◽  
Riparian Zones ◽  
Land Use Management ◽  
Sediment Delivery ◽  
Pulse Disturbance ◽  
Significant Difference ◽  
Press Disturbance

<p>This ecological and geomorphological assessment of Horokiri Stream and Ration Creek was conducted across four longitudinal zones to explore the effects of sediment delivery, run-off, channel form, riparian and in-stream habitat. The Horokiri Stream channel has moved approximately 7 metres westward over the last 20 years, with both banks now covered in long grass, flaxes, natives with a mix of tall canopy trees. Looking at stream, Spearman’s for Ration at Figure 27 (n = 16, rho -0.243, p = 0.36) as deposited sediment increased, MCI decreased, non-significant. Spearman’s for Horokiri at Figure 28 (n = 16, rho 0.247, p = 0.35) as MCI increased with sediment, non-significant. Results from upstream of the riparian zones showed more deposited fine sediment. However, within both the riparian zones the sediment deposition was much lower. The native riparian planting along the stream banks had a positive effect on reducing sedimentation. The findings support the concept that the restoration of riparian zones with buffer widths exceeding 10 metres can improve stream habitat and invertebrate health. There was no relationship between flow and deposition rate P(X2>241.84) = 0.24. Figure 24 shows deposited sediment on MCI depending on land use groups (X2 = 11.81, df = 4, p = 0.019). No statistically significant differences were found (comparing the effect of sediment between different land use management groups).  An experiment investigated a disturbance hypothesis in both Ration Creek and Horokiri Stream was conducted during February 2019. The experiment was designed to be long enough to study the effects of four weekly pulse flushing events created by scrapping the stream bed with a drain drag tool and the effects of a press sustained disturbance on the macroinvertebrate community. I measured the sediment and the macroinvertebrate captured in each trap within the experiment site every seven days. My prediction was that macroinvertebrate communities subject to sustained fine sediment delivery (press disturbance) are affected by simulated pulse flushing events (pulse disturbance). A comparison of sediment depositional rate before and after the manipulative experiment (Figure 36) showed higher sediment deposition after the pulse flushing events (1.55 W/A/D) compared to before during the assessment phase (0.88 W/A/D) in Horokiri (t = 2.35, df = 8.95, p = 0.04), but no significant difference before (1.57 W/A/D) or after (1.38 W/A/D) in Ration (t = -0.818, df = 7.71, p = 0.44). It appeared that the smaller riparian buffer width of 2-5m at Ration Creek did not limit sediment deposition. The effects of sediment disturbance in the experiment reflect the rapid ability of macroinvertebrates to respond to sediment by drifting out of unsuitable areas. The weekly pulse disturbance events resulted in increased sediment deposition compared to the background levels of sediment deposition (indicative of a press disturbance) in both streams. As pulse disturbance events increased, the number of macroinvertebrate taxa decreased. Horokiri Stream invertebrate communities declined by 33% compared to Ration Creek which declined by 50%.</p>

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