Preserving Critical Stormwater Storage Assets at Pipeline Terminal

2020 ◽  
Author(s):  
Vincent Huang ◽  
David J. Walter ◽  
Curtis R. Treen ◽  
John A. Richmond
Keyword(s):  
Slope Failure ◽  
Storm Events ◽  
Geotechnical Investigation ◽  
Shear Key ◽  
Failure Assessment ◽  
Close Proximity ◽  
Stormwater Pond ◽  
High Precipitation ◽  
Petroleum Storage ◽  
Northern Alberta

Abstract A slope failure compromised the integrity of a critical stormwater storage facility at a petroleum storage terminal within northern Alberta. Through periodic ground inspections and a review of LiDAR and aerial imagery, significant lateral deformation of a lined stormwater pond was identified. The potential for pond overflow and uncontrolled stormwater release into the natural environment due to compromised discharge outlets and liner integrity posed an operational and environmental risk. A fast-tracked review and assessment of both the historical and as-built construction details, a good understanding of the regional geology, and geotechnical investigation and instrumentation were required to identify remedial measures that could be implemented to restore the pond prior to the onset of major storm events. Geotechnical investigation and assessment showed weak zones in the bedrock at shallower depths than were historically encountered at the site. Spatial constraints, uncontrolled fill placement in close proximity to the pond, expansion of the pond following original construction, and compromised subsurface drainage were identified as factors that may have contributed to the failure. Assessment of remedial options considered impacts relative to both local and global factors of safety. The selected remedial option was a combination of slope unloading, shear key construction, and improved drainage with the design and construction occurring within a timeframe of 3 months to minimize the time that the pond was out of service. The paper highlights the challenges associated with the slope unloading and shear key construction that were required to control the ground movements. An approach involving sequential excavation and replacement was adopted to manage the risks associated with shear key construction. In addition, directional drill methods were incorporated to install some of the drainage measures due to the risk associated with an open cut approach. The project was fast-tracked to minimize exposure to high precipitation and limited stormwater storage capacity.

scholarly journals Key indicator tools for shallow slope failure assessment using soil chemical property signatures and soil colour variables

2017 ◽  
Vol 24 (29) ◽  
pp. 22861-22872
Author(s):  
Rashidi Othman ◽  
Shah Irani Hasni ◽  
Zainul Mukrim Baharuddin ◽  
Khairusy Syakirin Has-Yun Hashim ◽  
Lukman Hakim Mahamod
Keyword(s):  
Chemical Property ◽  
Slope Failure ◽  
Key Indicator ◽  
Failure Assessment ◽  
Soil Chemical Property ◽  
Shallow Slope Failure

scholarly journals A Geotechnical Investigation of 2017 Chattogram Landslides

Geosciences ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 337
Author(s):  
Md. Azijul Islam ◽  
Mohammad Shariful Islam ◽  
Abhijeet Acharjee Jeet
Keyword(s):  
Numerical Modeling ◽  
Degree Of Saturation ◽  
Sample Collection ◽  
Geotechnical Investigation ◽  
Contributing Factors ◽  
Notable Increase ◽  
High Precipitation ◽  
The Hill ◽  
Landslide Disaster

In this study, an attempt is made to uncover and discuss the geo-environmental characteristics, triggers, and consequences of a landslide disaster in the Chattogram Hill Tracts (CHT) region of Bangladesh. The hilly areas are composed of Tertiary and Quaternary sediments which have been folded, faulted, uplifted and, then deeply dissected by rivers and other water bodies. This paper presents a case study on the geotechnical investigation and numerical modeling of the landslides of 13 June 2017. A field visit and soil sample collection, followed by laboratory testing were conducted at the landslide-afflicted areas. The study revealed that the soil type was an important factor behind landslides, while high precipitation, hill cutting, deforestation, and unplanned human settlements act as contributing factors behind the landslide disaster. Extensive analysis of the geotechnical facts has been carried out, and an attempt is made to pinpoint the cause. A finite element modeling was conducted using PLAXIS 2D to investigate the failure mechanism. The numerical modeling results have suggested that most of the hill slopes were susceptible to failure after heavy rainfall. A conclusion is drawn that the landslides were triggered by incessant rainfall infiltrating into the subsoil, which led to a notable increase in its degree of saturation and a simultaneous reduction in suction and shear strength of the soil.

Implications of radiocarbon ages of organic and inorganic carbon in coastal lakes in Florida for establishing a reliable chronology for sediment-based paleoclimate reconstruction

2018 ◽  
Vol 91 (2) ◽  
pp. 638-649
Author(s):  
Yang Wang ◽  
Oindrila Das ◽  
Xiaomei Xu ◽  
Jin Liu ◽  
Shakura Jahan ◽  
...  
Keyword(s):  
Inorganic Carbon ◽  
Sediment Cores ◽  
Bulk Sediment ◽  
Storm Events ◽  
Coastal Lake ◽  
Paleoclimate Reconstruction ◽  
Small Reservoir ◽  
Coastal Lakes ◽  
Close Proximity ◽  
Organic And Inorganic Carbon

AbstractCoastal lake sediments are valuable paleoclimate archives provided that they can be accurately dated. Here, we report radiocarbon ages of bulk sediment organic matter (OM), plants, shells, particulate OM, and dissolved OM from coastal lakes in Florida. Bulk sediment OM yielded ages that are consistently older than contemporaneous plants and shells, indicating significant radiocarbon deficiencies in sedimentary OM in these lakes. The data show that the OM radiocarbon deficiency varies over time and with location, making it impossible to determine a proper correction factor for radiocarbon ages of bulk sediments from these lakes. As a result, we consider ages obtained from bulk sediment OM from these lakes unreliable. The age reversals in bulk sediment OM observed in the sediment cores are likely caused by rapid increases in erosion and sedimentation resulting from large storm events. The data also show that sedimentation rate can vary considerably within a given lake, implying that an age-depth model established for one core cannot be directly applied to other cores despite their close proximity. Analyses of shells from one of the lakes suggest that fresh/brackish-water shells may serve as a good substrate for radiocarbon dating owing to a small reservoir effect on inorganic carbon.

Earthflows in the Grondines and Trois Rivières Areas, Québec

1972 ◽  
Vol 9 (5) ◽  
pp. 561-573 ◽  
Author(s):  
P. F. Karrow
Keyword(s):  
River Valley ◽  
Time Span ◽  
Alluvial Deposits ◽  
Plant Matter ◽  
Close Proximity ◽  
High Precipitation ◽  
St Lawrence River

Extra-sensitive or quick clays are characteristic deposits of the Champlain Sea, which covered the St. Lawrence River valley about 11 000 years ago. Landslides of the earthflow type occur along many of the stream valleys. Rapid dissection and high precipitation are commonly associated with earthflows.Landforms characteristic of earthflows include bowls, slump slice ridges, pinnacles, inter-bowl ridges, and ribbing. Large earthflow complexes cover areas of several square miles, particularly just south of the St. Narcisse moraine. Earthflow debris spreads over alluvial deposits, many of which contain datable plant matter. Only a few prehistoric earthflows have been radiocarbon dated, but such data hold promise for the study of alluvial history and earthflow occurrence. At least two consecutive phases of earthflow activity have been noted in some areas, and a time span of several thousand years appears to be involved.Earthflows tend to occur in groups; historic flows in the area, including the classic St. Thuribe slide, have occurred in close proximity to older slides. Therefore certain slide-prone areas can be designated for planning purposes. It is advisable to avoid having building sites near present stream valleys.

scholarly journals Kinematic Analysis of the Dam and Powerhouse Sites of the Baglihar Hydropower Project

2020 ◽  
Vol 9 (3) ◽  
pp. 3687-3695
Keyword(s):  
Kinematic Analysis ◽  
Slope Failure ◽  
Anthropogenic Activities ◽  
Hydropower Project ◽  
Geotechnical Investigation ◽  
Plane Failure ◽  
Analysis Techniques ◽  
Wedge Failure ◽  
Work Done ◽  
Joint Pattern

The present study assesses the slope stability at the most significant Baglihar Dam for slope failure and landslides occurrences. The study comprises of twelve sites which were selected for detailed geotechnical investigation for assessment of potential slope failures using basic Rock Mass Rating (RMRb), Slope Mass Rating (SMR) and kinematic analysis techniques. The results show that even though the rocks are of fair quality but other factors including joint pattern and density caused by tectonic and anthropogenic activities have rendered three sites completely unstable, 8 sites are unstable and one site is stable. Moreover Nine sites are susceptible to wedge failure, six to topple and two to plane failure. The RMRb value varies from 45 to 55 and SMR value varies from 11 to 44. The thorough results and interpretation of work done is presented in this paper.

scholarly journals Characterisation of transport resilience and measures to enhance resilience in the recovery after the 2016 Kaikōura earthquake

2021 ◽  
Vol 54 (2) ◽  
pp. 69-81
Author(s):  
Dougal Mason ◽  
Pathmanathan Brabhaharan
Keyword(s):  
Slope Failure ◽  
Recovery Phase ◽  
Transport Network ◽  
Transport Infrastructure ◽  
Storm Events ◽  
The South ◽  
National State ◽  
The North ◽  
State Highway ◽  
Kaikoura Earthquake

The Ward to Cheviot section of State Highway 1 is a key lifeline transport route that runs through the Kaikōura township.  It is a strategically important link in the national state highway network, connecting the North Island via the Wellington-Picton ferry to the city of Christchurch in the South Island.  Its strategic importance and vulnerable location between the mountainous Kaikōura range and the Pacific Ocean make it a critical transportation route in the national transport network.  The route has been a focus for understanding the resilience of transport networks from as far back as 2000, when this section was used as a pilot study in early research into transport resilience.  A further resilience assessment of this section was completed as part of a national state highway resilience study in mid-2016.  Subsequently, the Mw 7.8 Kaikōura earthquake struck the northeast of the South Island on 14 November 2016, triggering thousands of large landslides and causing severe disruption to the transport network.  The damage and disruption caused by the earthquake was comparable to that assessed in pre-earthquake studies of the resilience of the state highway.  Landslides and embankment failures caused the most damage and disruption to the transport infrastructure, with the Main North Line railway closed for over 9 months and State Highway 1 closed for over a year.  Post-earthquake landslides and debris flows triggered by storms caused additional damage and disruption during the recovery phase. Post-earthquake assessment of the corridor resilience was carried out to identify measures to enhance resilience as part of the recovery works.  These measures included realigning the road and rail away from the steep hillsides, engineered works to reduce the potential for slope failure, and engineered works to reduce the potential for inundation of the corridor.  The resilience assessments also enabled tactical and operational measures to be put in place to ensure safety while allowing the recovery operations to proceed in the context of enhanced risk associated with storm events and potential aftershocks.

scholarly journals A Study of the Dynamics of Soil Erosion Using Rusle2 Modelling and Geospatial Tool in Edda-Afikpo Mesas, South Eastern Nigeria

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Joseph I. Amah ◽  
Okechukwu P. Aghamelu ◽  
Olufemi V. Omonona ◽  
Ikechukwu M. Onwe
Keyword(s):  
Soil Erosion ◽  
Soil Loss ◽  
Slope Failure ◽  
Liquid Limit ◽  
Storm Events ◽  
Remotely Sensed Data ◽  
Erosion Processes ◽  
Hill Slope ◽  
Intense Storm ◽  
Very High

AbstractThe Revised Universal Soil Loss Equation (RUSLE) was used to study the soil erosion processes in Edda-Afikpo mesas, Lower Cross River watersheds,Nigeria. The mesas occupy an area estimated at 60km2 on a surface relief of about 284m. DEM data, satellite images and basemap of the area were used. Remotely sensed data were ground-truthed through extensive field works. The results show that the process is facilitated by the Trifecta of hill slope hydrology, geology and land use practices. Steep hill Slope of values 78 % at the major hot spots, very fragile, dry and non-plastic sandy soils all aid sediment detachment. Analysis of the index properties which include Liquid Limit(LL) of 25-30, moisture content(w%) of 5.9-7.4, permeability of 1.541x10-3 – 1.636x10-3 cm/s and shear strength of 36-42 KN/m2 predispose the sediments to detachment and erosion. Based on the analysis, the amount of soil loss in the project area is about 1373.79 ton per year. Soil erosivity factor is high at the mesas(5023.83 MJ mm ha−1 h−1 yr−1 - 5069.51 MJ mm ha−1 h−1 yr−1) The sandy layer attain thickness of 50m-60m in places and with high pore pressure development, slope failure are triggered during intense storm events. In terms of vulnerability level in erosion risk, high to very high constitute 4.1% of the watershed which translate to 5.05km2 of the 59km2. The various processes occur simultaneously and are exacerbated by human factors through seasonal bush burning and development along drainage lines. The study reveals that 18.8% of the available land for development is at high to very high risk of erosion. The soil loss model has been validated and the hotspots from the map coincide with the gully sites. The results of this research can therefore be used for conservation and adaptation purposes.

Effects of Vincristine on Endothelial Microtubules in the Spinal Cord

1976 ◽  
Vol 34 ◽  
pp. 58-59
Author(s):  
John L. Beggs ◽  
John D. Waggener ◽  
Wanda Miller
Keyword(s):  
Spinal Cord ◽  
Biological Activity ◽  
Horseradish Peroxidase ◽  
Transport Mechanism ◽  
Vasogenic Edema ◽  
Vesicular Transport ◽  
Close Proximity

Microtubules (MT) are versatile organelles participating in a wide variety of biological activity. MT involvement in the movement and transport of cytoplasmic components has been well documented. In the course of our study on trauma-induced vasogenic edema in the spinal cord we have concluded that endothelial vesicles contribute to the edema process. Using horseradish peroxidase as a vascular tracer, labeled endothelial vesicles were present in all situations expected if a vesicular transport mechanism was in operation. Frequently,labeled vesicles coalesced to form channels that appeared to traverse the endothelium. The presence of MT in close proximity to labeled vesicles sugg ested that MT may play a role in vesicular activity.

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