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Metadata: 2008, Metoc, Sherigham Shoal Offshore Wind Farm, Cable Landfall Erosion Study
Abstract:
StatoilHydro is planning to install two export cables to connect its Sheringham Shoal Offshore Wind Farm to the UK National Grid. The landfall will be at Weybourne on the North Norfolk coast. This desk study was commissioned to identify the optimum burial depth of the cables at the landfall by investigating the surface geology. Design requirements are: 1) The overburden must never reduce below 1.5 m, which is the safety margin deemed to prevent the cables being exposed; and 2) Subject to requirement 1, the overburden should be kept to a minimum to permit effective dissipation of heat from the cable. The target of the present study is thus to determine the minimum burial depth that will preserve both the above conditions throughout the lifetime of the scheme, taking account of future erosion and climate change deliberations. The storm beach at the landfall is actively mobile and is migrating alongshore in a westward direction; it is also retreating landward due to coastal erosion with an average landward erosion rate of around 1 m per year. Additionally, there is a risk that beach material may be temporarily denuded at times of severe storm surge such as those of 1953 and 1997; events of this severity would be likely to expose the cables if simply buried in the beach material. Therefore, it is strongly advisable to bury the cables in the rock underlying the beach rather than in the beach material itself. Due to the complex geology at this location, it is not possible to prescribe a burial depth profile that will guarantee to satisfy both of the above design requirements. The precise nature of the underlying rock is uncertain; there are several candidate formations ranging from firm chalk to loose glacial material. The Project has provided some geotechnical survey data at locations offshore of the landfall. However, in order to answer the above questions, more geotechnical and geophysical data will be needed at the landfall itself (e.g. subsurface radar and deep boreholes). Also, a site visit is recommended to improve understanding of the beach profile and to help to identify the underlying geology. This desktop study has been based on literature in the public domain; survey charts provided by StatoilHydro; and experience of similar projects in the region. There is potential to progress this work further with follow-up studies as more survey data become available.
Data holder:
Scira Offshore Energy Ltd
| Other details | ||
| Internal code | Internally assigned metadata identifier | 4828 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | 2008, Metoc, Sherigham Shoal Offshore Wind Farm, Cable Landfall Erosion Study |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | 69aee89cfbd254d5b6bea2013a46a5da |
| Resource Identifier | This is the code assigned by the data owner. | 3573 |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | series |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2008-06-02 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2008-06-02 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | inapplicable |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | notPlanned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | StatoilHydro is planning to install two export cables to connect its Sheringham Shoal Offshore Wind Farm to the UK National Grid. The landfall will be at Weybourne on the North Norfolk coast. This desk study was commissioned to identify the optimum burial depth of the cables at the landfall by investigating the surface geology. Design requirements are: 1) The overburden must never reduce below 1.5 m, which is the safety margin deemed to prevent the cables being exposed; and 2) Subject to requirement 1, the overburden should be kept to a minimum to permit effective dissipation of heat from the cable. The target of the present study is thus to determine the minimum burial depth that will preserve both the above conditions throughout the lifetime of the scheme, taking account of future erosion and climate change deliberations. The storm beach at the landfall is actively mobile and is migrating alongshore in a westward direction; it is also retreating landward due to coastal erosion with an average landward erosion rate of around 1 m per year. Additionally, there is a risk that beach material may be temporarily denuded at times of severe storm surge such as those of 1953 and 1997; events of this severity would be likely to expose the cables if simply buried in the beach material. Therefore, it is strongly advisable to bury the cables in the rock underlying the beach rather than in the beach material itself. Due to the complex geology at this location, it is not possible to prescribe a burial depth profile that will guarantee to satisfy both of the above design requirements. The precise nature of the underlying rock is uncertain; there are several candidate formations ranging from firm chalk to loose glacial material. The Project has provided some geotechnical survey data at locations offshore of the landfall. However, in order to answer the above questions, more geotechnical and geophysical data will be needed at the landfall itself (e.g. subsurface radar and deep boreholes). Also, a site visit is recommended to improve understanding of the beach profile and to help to identify the underlying geology. This desktop study has been based on literature in the public domain; survey charts provided by StatoilHydro; and experience of similar projects in the region. There is potential to progress this work further with follow-up studies as more survey data become available. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | This desktop study has been based on literature in the public domain; survey charts provided by StatoilHydro; and experience of similar projects in the region. There is potential to progress this work further with follow-up studies as more survey data become available. |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | Presentation type: digital representation of a primarily textual item (can contain illustrations also) Origin: METOC |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Cable Landfall |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Pre-Construction monitoring | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Wave height estimates | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Coastal geomorphology | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Sediment grain size parameters | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
| Keyword title | MEDIN | |
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network |
| Keyword title | MEDIN | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 53.174333255759 |
| East | The eastern-most limit of the data resource in decimal degrees | 1.2244886798664 |
| South | The southern-most limit of the data resource in decimal degrees | 53.096122217091 |
| West | The western-most limit of the data resource in decimal degrees | 1.0742216214591 |
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | Scira Offshore Energy Ltd | |
| Position name | COWRIE uploader | |
| Phone | 0044 (0) 203 204 3200 | |
| Fax | N/A | |
| Delivery point | One Kingdom Street, London, W2 6BD, United Kingdom | |
| info@scira.co.uk | ||
| URL | www.scira.co.uk | |
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | Scira Offshore Energy Ltd | |
| Position name | COWRIE uploader | |
| Phone | 0044 (0) 203 204 3200 | |
| Fax | N/A | |
| Delivery point | One Kingdom Street, London, W2 6BD, United Kingdom | |
| info@scira.co.uk | ||
| URL | www.scira.co.uk | |
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Scira Offshore Energy Ltd | |
| Position name | COWRIE uploader | |
| Phone | 0044 (0) 203 204 3200 | |
| Fax | N/A | |
| Delivery point | One Kingdom Street, London, W2 6BD, United Kingdom | |
| info@scira.co.uk | ||
| URL | www.scira.co.uk | |
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/1969/summary |
| Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk | |
| Dataset constraints | ||
| 21 Conditions for Access and Use - Use limitation | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | no conditions apply |
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2008-01-01 |
| Date of creation | The date that the resource was created. | 2008-06-02 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2009-07-02 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery Metadata Standard |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | Version 2.3.5 |