Sediment Retained

This layer depicts estimated sediment/soil retention across New Zealand and was created using the NZeem erosion model. Sediment retained is defined as the difference between soil loss with and without tree cover (sediment loss avoided). Erosion control is defined as the prevention of soil loss by an ecosystem. NZeem has been calibrated from sediment discharges measured in New Zealand rivers (Dymond et al., 2010). This model estimates the long-term mean erosion rate from all sources of erosion, both mass-movement and surficial, and accounts for all sizes of rainfall events. The model was run on the national datasets of rainfall, erosion terrains, and land cover to produce a national 1:50,000 scale map of long-term mean erosion rates. Dymond et al. (2010) assessed the accuracy of the model by comparing predictions of specific sediment discharge (assuming sediment delivery ratio of 1 everywhere) with available measurements and obtained a model efficiency of 0.64.

Data and Resources

Additional Info

Field Value
Author Landcare Research
Maintainer Landcare Research
Maintainer Email Landcare Research
Created 2018-04-23T21:21:00.490848Z
Date modified 2018-06-08T03:49:48.299377Z
Efficiency Type
Dollars Saved
Jurisdiction New Zealand
Language English
Source Identifier
Record created May 3, 2018, Last Updated August 3, 2018