Environmental Reporting, Ministry for the Environment and Statistics New Zealand
Position Name
Analyst
Contact Info
Contact
Address
Address
Delivery Point
23 Kate Sheppard Place, PO Box 10362
City
Wellington 6143
Country
New Zealand
Electronic Mail Address
Environmental.Reporting@mfe.govt.nz
Role
Role Code
distributor
Date Stamp
Date
2016-01-21
Metadata Standard Name
ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
Metadata Standard Version
1.1
Reference System Info
Reference System
Reference System Identifier
Identifier
Code
2193
Identification Info
Data Identification
Citation
Citation
Title
Observed streambed sedimentation, 1990–2011
Date
Abstract
"Fine sediment is the collective term for inorganic particles deposited on the streambed less than 2mm in size. Urban development and agriculture and forestry around waterways can increase the amount of sediment entering river systems. Sedimentation can clog space between pebbles that are used by aquatic insects and fish, alter food sources, and remove sites used for egg laying. Excess sediment can affect the appeal of rivers and streams for recreation. This dataset relates to the ""Streambed sedimentation"" measure on the Environmental Indicators, Te taiao Aotearoa website.
Field names NZREACH Stream segment label SEDO Predicted observed percentage fine sediment cover, i.e. contemporary state SEDE Predicted expected percentage fine sediment cover, i.e. reference state. "
Status
Progress Code
completed
Point Of Contact
Responsible Party
Organisation Name
Environmental Reporting, Ministry for the Environment and Statistics New Zealand
Method: "Using the Wentworth (1922) classification system, fine sediment is characterised by particle size as mud and silt (<0.0625 mm) and sand (0.0625–2 mm). Some New Zealand stream beds are naturally dominated by fine sediment, although these are usually very small with low slopes, low rainfall, and on sandy soils Stream bed sedimentation is typically measured by visually estimating the proportion of the river bed covered by different sized substrates. This information is collected during fish surveys, and is stored in the Freshwater Fish database managed by NIWA. Observed in–stream sediment values for 10,026 sites are reported, dating from 1990 to 2011, in order to derive contemporary cover. The exception was Fiordland where all available information (1970 to 2011) was used to fill a representation gap. A regression model was used to predict the relative proportion of fine sediment cover in every stream in New Zealand. This is inferred from the measured percent of fine sediment cover and predictors such as the slope of the river, climate and catchment land cover. The accuracy of the data source is of medium quality.
For further information please see: Clapcott, J.E., Young, R.G., Harding, J.S., Matthaei, C.D., Quinn, J.M., and Death, R.G. (2011) 'Sediment Assessment Methods: Protocols and guidelines for assessing the effects of deposited fine sediment on in–stream values.' (Cawthron Institute: Nelson, New Zealand) Wentworth, C (1922). A scale of grade and class terms for clastic sediments. Journal of Geology, 30(5), 377–392. Available from www.jstor.org. "
Metadata Constraints
Legal Constraints
Use Limitation
Creative Commons Attribution 3.0 New Zealand by Ministry for the Environment
Access Constraints
Restriction Code
license
Metadata Constraints
Legal Constraints
Use Limitation
Creative Commons Attribution 3.0 New Zealand by Ministry for the Environment
