Sediment Accumulation in Sandspit Traps on Target for >300mm per Year, Again!

Mud near a Whangateau sediment trap

Mud near a Whangateau sediment trap

At the start of the year I installed an additional sediment trap at both the Sandspit and Whangateau sites, with a view to increasing the precision of the estimates of sediment accumulation in a theoretical hole dug in the estuaries.

Not surprisingly, this has made no difference to the interpretation of the annual rate of sediment accumulation. The Sandspit traps are accumulating sediment at an annual rate of a little over 300mm, which is the same as last year.

The updated spread sheet is attached, showing the results for this year with the three traps at each site. The Whangateau traps continue to accumulate sediment at a rate a little over half of that at Sandspit.

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A New Start for the Sediment Traps at Sandspit and Whangateau

Mud near a Whangateau sediment trap

Mud near a Whangateau sediment trap

A full year of results from the sediment traps at Whangateau and in the footprint of the proposed marina at Sandspit indicated a likely filling rate for the marina of 329.3mm in one year. This is far in excess of the estimate of only 30mm from the marina proposers. There was no experimental verification or ground truthing of that theoretical estimate, despite the SYCMS having ample time to do so.

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