A re‐investigation of the bathymetry of Loch Earn

Alansari, Nadia; McManus, John

doi:10.1080/00369228008736460

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…The bathymetric surveys are used to directly measure sediment deposited in lakes and reservoirs, with many procedures being introduced for water depth measurements. Murray and Pullar presented a lead-lining recorder method for water depth measured using a winch system which was used in Loch Earn in the Grampian Highlands of Scotland (Al-Ansari & McManus 1980). Weighted wire drag survey methods were introduced in 1904, and acoustic depth sounding (fathometer) was used in the 1930 (USACE 2004;NOAA 2012).…”

Section: Bathymetric Surveymentioning

confidence: 99%

Bathymetry and siltation rate for Dokan Reservoir, Iraq

et al. 2017

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The Dokan Reservoir dam is a concrete cylindrical arch with gravity abutments, located on the Lesser Zab River about 60 km from the city of Sulaimani in north-eastern Iraq. A bathymetric survey was conducted in November 2014 for a period of 10 days, using an echo sounder of 200-kHz single beam. The survey results indicated an annual average sediment deposition of 3.8 million m 3 . Thirty-two sediment samples were collected from the reservoir bed. The ratio of gravel, sand, silt and clay was 15:14:48:23, respectively. The reservoir bed is covered mainly with silt. The sediments are composed of silty clay (77.6%), silty sandy clay (10%), sandy gravely silty clay (1.2%) and gravely sandy silty clay (1%).

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Section: Bathymetric Surveymentioning

confidence: 99%

Bathymetry and siltation rate for Dokan Reservoir, Iraq

et al. 2017

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“…It occupies a steepsided but largely flat-floored basin which has a maximum depth of 87.2 m and shelves eastwards . In their 1973 bathymetric survey of the loch Al-Ansari and McManus (1980) found only very minor changes when comparing their chart with that produced from a survey in 1902 by Murray and Pullar (1910). Moreover, the changes observed could mainly be attributed to the use of more advanced surveying techniques.…”

Section: Settingmentioning

confidence: 78%

“…However, sediment yields of this order have been determined in several nearby upland catchments devoted to rough grazing ( J. McManus, personal communication) thus lending support to its validity. The much higher regional value of 180 tonneskm-' yr-', from which the loch bed accretion rate was derived by Al-Ansari and McManus (1980), relates to a catchment incorporating substantial areas of land devoted to arable farming which tend to yield much higher quantities of sediment (J. McManus, personal communication).…”

Section: Field Measurements and Resultsmentioning

confidence: 99%

“…Moreover, the changes observed could mainly be attributed to the use of more advanced surveying techniques. From a knowledge of average annual sediment yield, determined as 180 tonnes km-2 yr-' by studies of sediment transport in the River Earn catchment, Al-Ansari and McManus (1980) estimated that an average infill of about 12 cm over the loch floor would have been expected in the period between surveys. They pointed out, however, that such an amount of accretion would border on the limit of detection using such widely different methods as in the two surveys concerned.…”

Section: Settingmentioning

confidence: 99%

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The effect of road construction on sediment deposition in Loch Earn, Scotland

Duck

1985

Earth Surf Processes Landf

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In 1982 an unmetalled road was constructed in a Scottish Highland glen, Glen Ogle, crossing several left bank tributaries of the Ogle Burn, one of the main influents to Loch Earn. As a result, at least 1824 tonnes of sediment were deposited over an area of 4.6 ha of loch bed in less than 2 months. This was over 20 times as much material by weight than had passed a temporary gauging station, near the confluence with the loch, during an earlier 12 month monitoring period. The mean thickness of the resultant deposit should, under normal circumstances, have taken some 20 to 25 years to accumulate. Thus, this study provides a quantified illustration of the potential impact of a specific human activity on the acceleration of erosion and deposition rates.

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“…Surface navigational information is provided by bathymetric survey charts, which are created to support the safety of surface or sub-surface navigations. These charts often depict seafloor relief or terrain as contour lines, or depth contours [1,2]. The survey settings for the best description of the topographical aspects of the submarine, which may include more accurate slope corrections and sound velocity, while removing safety bias [3].…”

Section: Introductionmentioning

confidence: 99%

Bathymetric survey and volumetric analysis of Bakolori dam reservoir North West Nigeria

Shuaibu

2024

Afr. Sci. Rep.

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Many approaches have been devised for measuring water depth in bathymetric surveys, which are used to assess sediment deposited directly in lakes and reservoirs. This technique is mostly used to calculate the reservoir's capacity and the amount of sedimentation that occurs there. The results of the volumetric analysis and bathymetric survey of the Bakolori Dam reservoir, which is situated in Northwestern Nigeria, are presented in this work. During this investigation, the differential Global Positioning System receiver (GPS), automatic level measuring tool, echo-sounder, and engine boat were utilized. ArcGis 10.0 was used to analyze the acquired data. In order to evaluate the reservoir capacity loss during the Bakolori reservoir's operating period as of 1983, the designed computed reservoir capacity was compared with the current bathymetry survey. At a spillway crest elevation of 334 meters above mean sea level (amsl), the reservoir's initial capacity is reported as 430 million cubic meters (MCM). However, the capacity has since been revised to 291 meters at the same level, with a volume change of 139,269,495 m3. As a result, the reservoir's volume changed by approximately 139 MCM during a thirty-five (35) year period of service, representing a loss of storage capacity, while the annual siltation rate was around 3,979,128 m3/a. This indicated that 33% of the reservoir's storage capacity had silted up. This is demonstrated by the aquatic weeds that have grown to a height of 334.21 meters on the lake's surface, rising from the lakebed. Therefore, to prevent total siltation, the dam reservoir needs to be adequately dredged.

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A re‐investigation of the bathymetry of Loch Earn

Cited by 7 publications

References 6 publications

Bathymetry and siltation rate for Dokan Reservoir, Iraq

Bathymetry and siltation rate for Dokan Reservoir, Iraq

The effect of road construction on sediment deposition in Loch Earn, Scotland

Bathymetric survey and volumetric analysis of Bakolori dam reservoir North West Nigeria

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