Parent Layer: Sediment - Median Climate Change Projection - 2050 RCP4.5

Name: Sediment Load - Contemporary State

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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-weight:bold;">This file provides net sediment load (t yr-1) for climate projections based on a contemporary landcover scenario. Sediment loads are modelled using SedNetNZ for all RECv2.4 segments.</SPAN></P><P><A href="https://objective.envbop.net:443/id:A3862522/document/versions/latest" STYLE="text-decoration:underline;"><SPAN>SedNetNZ Report</SPAN></A></P><P><A href="https://objective.envbop.net:443/id:A3862518/document/versions/latest" STYLE="text-decoration:underline;"><SPAN>SedNetNZ Data Dictionary</SPAN></A></P><P><SPAN>The contemporary state is represented using 2018 land cover (LCDB v5). It also includes representation of existing and planned riparian fencing across the region based on spatial fencing data supplied by BOPRC. Detainment bunds are included where these have been installed in several catchments within the Rotorua Lakes WMA. For comparison, we model the contemporary state scenario with and without the effect of riparian fencing. This provides an estimate of the reduction in suspended sediment loads that may be attributable to all existing and planned riparian fencing. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-size:12pt">The SedNetNZ sediment budget model was developed to represent the diversity of erosion processes that occur in New Zealand. This includes shallow landslide, earthflow, gully, and surficial erosion (Dymond et al. 2016), as well as streambank erosion using a recently improved bank erosion model (Smith et al. 2019b). Model outputs for these erosion processes are combined with losses due to floodplain deposition and lake sediment trapping to estimate mean annual suspended sediment loads at the REC2 subcatchment level. While conceptually similar to the Australian SedNet model (Wilkinson et al. 2009), SedNetNZ differs in the specific representation of erosion processes that predominantly occur in New Zealand, particularly mass movement processes (shallow landslide, earthflow) that are not included in the Australian SedNet model, and through its parameterisation using data from New Zealand (e.g. Betts et al. 2017). </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN STYLE="font-size:12pt">SedNetNZ has been widely applied at a regional scale to predict suspended sediment loads while accounting for the effects of erosion mitigation measures. Recent examples of regional-scale model applications include Hawke’s Bay (Spiekermann et al. 2017; Smith et al. 2020), Southland (Neverman et al. 2021b), and Taranaki (Neverman et al. 2021a). SedNetNZ has been used to test land management scenarios, including the effects of riparian fencing for stock exclusion, implementation of whole farm plans, and scrub reversion on suspended sediment loads. The model has also been used to examine the effects of climate change. For example, Basher et al. (2020) modelled erosion and suspended sediment loads in the Horizons region and assessed the extent to which land management initiatives could offset increases in sediment load due to climate change by mid- and late-century. </SPAN></P><P><SPAN /></P></DIV></DIV></DIV>

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