Report: TR 2012/01
Author: J Hoyle, M Hicks, H Roulston (NIWA)
Sustainable management of the Waikato region’s land and aquatic environment requires ongoing monitoring of various environmental parameters.
Sediment in receiving water bodies is of concern, so monitoring of sediment loads and yields is required to identify and quantify its sources, manage its effects, and to measure trends and the effectiveness of management measures.
Since it is a prohibitive undertaking to continuously monitor sediment in every basin across the region, an alternative is to develop an understanding of how sediment yields vary with differing land use and basin hydrological and physical characteristics. From this, sediment yield on a regional basis can be proxied by monitoring land use and hydrological parameters such as rainfall or runoff.
Towards this understanding, this report presents results from sediment yield studies at 23 catchments under various land uses in the Waikato region.
|1.1||Background and purpose||6|
|1.5||Data availability for sediment yield analysis||13|
|2.1||The sediment concentration rating approach||16|
|2.2||The storm even sediment yield rating approach||17|
|2.3||Determining magnitude-frequency relationships for event sediment yields||19|
|3.3||Annual yield variability||27|
|3.4||Event yield magnitude-frequency relations||27|
|3.5||Sediment yield vs catchment characteristics||28|
|3.6||Comparison of results with other studies form Waikato-Auckland region||32|
|4||Recommended further work||34|
|Appendix A - Sediment concentration rating plots||37|
|Appendix B - Event sediment yield ratings||49|