Tagged: sediment

Erosional sediment in Coromandel streams - Guest Work

Guest Author • Sep 22, 2017 •

• #WaiNZ,
• erosion,
• sediment,
• Water quality

Last week, Centre of Research Excellence Te Pūnaha Matatini hosted #WaiNZ, a national conversation providing New Zealanders with an opportunity to read blog posts and other media from key influencers talking about their relationships with water. With permission, Sciblogs is re-publishing some of the blog posts here, including Mary Sewell’s thoughts on eorsion and sediment impacts on waterways, shared below.  Opito Bay … Read More

Mangroves: ‘Bioshields’ of our coastlines - News

Erica Mather • Jul 27, 2015 •

• climate change,
• coastline,
• Environment and Ecology,
• erosion,
• estuaries,
• mangroves,
• sea level rise,
• sediment

The importance of mangroves in estuaries and river deltas has been highlighted in a new study. Vulnerable parts of the coast are protected from erosion by the mesh-like roots of mangroves that trap soil, buffering the impact of waves and tidal currents. New Zealand and UK scientists utilised data on the New Zealand mangrove (mānawa) in a new … Read More

Hapua: developments in understanding river mouth lagoons and their responses to freshwater regimes - Waiology

Waiology • Nov 03, 2014 •

• coastal,
• fluvial,
• geomorphology,
• hapua,
• lagoon,
• sediment

By Deirdre Hart Hapua are a type of predominantly freshwater river mouth lagoon that occurs on high energy temperate coasts. In New Zealand, they comprise a group highly-dynamic and socio-culturally important environments (Figure 1). Hapua behave differently to lagoons with tidal prisms. This means that classic estuary models cannot be applied to their understanding or management. Over the last three … Read More

Landscapes shaped by water - Waiology

Waiology • Oct 30, 2014 •

• deposition,
• erosion,
• fluvial,
• geomorphology,
• landforms,
• landscape,
• sediment

By Daniel Collins New Zealand is both a pluvial and fluvial country. A lot of water falls on, moves through, and runs off the landscape to the surrounding seas. At each step along the way water can play a role in shaping the landscape, whether by resisting or facilitating erosion or by providing environments where eroded sediment is deposited. Read More

Using models to understand and protect our braided rivers - Waiology

Waiology • Jun 23, 2014 •

• Braided rivers,
• fluvial,
• geomoprhology,
• modelling,
• sediment

By Murray Hicks Braided rivers, defined by networks of channels that are forever changing and shifting, are iconic features of the New Zealand landscape. Their existence depends on abundant supplies of gravelly sediment and frequent disturbance by floods and freshes. They also support unique communities of in-stream and terrestrial organisms (fish and birds) that have adapted to this dynamic physical … Read More

How does agriculture affect New Zealand’s water quality? - Waiology

Waiology • Dec 05, 2013 •

• agriculture,
• e coli,
• land use,
• nitrogen,
• nutrients,
• Phosphorus,
• sediment,
• Water quality

By Bob Wilcock About 40% of the land area of New Zealand is in some form of agriculture. Sheep and beef farming are the most extensive (33%) followed by dairy farming at 6%, and the remainder being horticulture and cropping. Based on a large number of comparative land use studies we have a good understanding of how agriculture affects … Read More

ANZICE Part 3: Southern Ocean – New Zealand Responses - Journeys to the ice

Matthew Wood • Jun 05, 2010 •

• ANZICE,
• insolation,
• ocean temperature,
• phytoplankton,
• pollen,
• sediment

New Zealand is a geographically lonely place. It is the only major landmass between the tropics and Antarctica at these longitudes, and shares the southern mid-latitudes with only Patagonia and Tasmania. As such, it is a fantastic natural laboratory for investigating oceanic and atmospheric change in the southern hemisphere. Our country is perpetually being ground down … Read More