Landscape evolution and hydrogeochemical characteristics of the Pourewa Stream catchment, lower North Island, New Zealand
Issues regarding water quality and supply have been raised within the Pourewa catchment, following ongoing landuse change and associated demand for freshwater. Nitrogen loss from farms due to leaching of nitrate into the subsurface has increased in conjunction with landuse intensification. The strea...
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| Veröffentlicht in: | New Zealand journal of geology and geophysics 2019-04, Vol.62 (2), p.147-170 |
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| container_title | New Zealand journal of geology and geophysics |
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| creator | Rees, Callum Palmer, Julie Palmer, Alan Singh, Ranvir |
| description | Issues regarding water quality and supply have been raised within the Pourewa catchment, following ongoing landuse change and associated demand for freshwater. Nitrogen loss from farms due to leaching of nitrate into the subsurface has increased in conjunction with landuse intensification. The stream dissects Whanganui Basin fill, including alternating coarse and fine-grained sediments deposited throughout Quaternary climatic cycles, resulting in interbedded aquifers and aquitards in a geologically young landscape. The Rangitikei River dominates the landscape, forming a series of aggradational terraces. Fault lines and basement highs provide a control on both the underlying Plio-Pleistocene strata and modern-day drainage network. A 1:25 000 hydrogeological map and corresponding structural interpretation are presented. Analysis of catchment lithologies demonstrates the importance of grain size, porosity and age in dictating hydraulic conductivity. Organic carbon, illite and glauconite present within the succession indicate attenuation of nitrate within the local groundwater system is taking place. |
| doi_str_mv | 10.1080/00288306.2018.1541812 |
| format | Article |
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Nitrogen loss from farms due to leaching of nitrate into the subsurface has increased in conjunction with landuse intensification. The stream dissects Whanganui Basin fill, including alternating coarse and fine-grained sediments deposited throughout Quaternary climatic cycles, resulting in interbedded aquifers and aquitards in a geologically young landscape. The Rangitikei River dominates the landscape, forming a series of aggradational terraces. Fault lines and basement highs provide a control on both the underlying Plio-Pleistocene strata and modern-day drainage network. A 1:25 000 hydrogeological map and corresponding structural interpretation are presented. Analysis of catchment lithologies demonstrates the importance of grain size, porosity and age in dictating hydraulic conductivity. Organic carbon, illite and glauconite present within the succession indicate attenuation of nitrate within the local groundwater system is taking place.</description><subject>Aggradation</subject><subject>aquifer</subject><subject>Aquifers</subject><subject>Aquitards</subject><subject>Attenuation</subject><subject>Basins</subject><subject>Catchment area</subject><subject>Catchments</subject><subject>Climatic cycles</subject><subject>Drainage control</subject><subject>Drainage network</subject><subject>Evolution</subject><subject>Farms</subject><subject>Fault lines</subject><subject>Freshwater</subject><subject>Geological faults</subject><subject>Glauconite</subject><subject>Grain size</subject><subject>Groundwater</subject><subject>Hydraulic conductivity</subject><subject>Hydrogeochemistry</subject><subject>Hydrogeology</subject><subject>hydrogeology Whanganui Basin</subject><subject>Illite</subject><subject>Illites</subject><subject>Inland water environment</subject><subject>Landscape</subject><subject>Leaching</subject><subject>Organic carbon</subject><subject>Pleistocene</subject><subject>Plio-Pleistocene</subject><subject>Porosity</subject><subject>Quaternary</subject><subject>Rivers</subject><subject>Sediments</subject><subject>stratigraphy</subject><subject>Terraces</subject><subject>Water quality</subject><issn>0028-8306</issn><issn>1175-8791</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp9kFtLw0AQhRdRsF5-grDga1P3km2SN6V4KRQV1Bdflulm1kSSbN3dGvrvTai--jSc4TtnhkPIBWczznJ2xZjIc8nmM8F4PuMq5TkXB2TCeaaSPCv4IZmMTDJCx-QkhM9BztOCT8huBV0ZDGyQ4rdrtrF2HR1WtNqV3n2gMxW2tYGGmgo8mIi-DrE2gTpLY4X02W099kBfokdoqYFoqha7OKWN69HTR-djRZehGUKn9BF7-o4wijNyZKEJeP47T8nb3e3r4iFZPd0vFzerBOScx8RmZS5YClJJIZlcG4nMCERpVWYsFjlTImXAMg4FcFHaNTJlpZqnKViVruUpudznbrz72mKI-nN4uRtOaiH44C84KwZK7SnjXQgerd74ugW_05zpsWX917IeW9a_LQ--672v7qzzLfTON6WOsGuctx46Uwct_4_4AfpChN8</recordid><startdate>20190403</startdate><enddate>20190403</enddate><creator>Rees, Callum</creator><creator>Palmer, Julie</creator><creator>Palmer, Alan</creator><creator>Singh, Ranvir</creator><general>Taylor & Francis</general><general>Taylor & Francis Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope></search><sort><creationdate>20190403</creationdate><title>Landscape evolution and hydrogeochemical characteristics of the Pourewa Stream catchment, lower North Island, New Zealand</title><author>Rees, Callum ; 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Nitrogen loss from farms due to leaching of nitrate into the subsurface has increased in conjunction with landuse intensification. The stream dissects Whanganui Basin fill, including alternating coarse and fine-grained sediments deposited throughout Quaternary climatic cycles, resulting in interbedded aquifers and aquitards in a geologically young landscape. The Rangitikei River dominates the landscape, forming a series of aggradational terraces. Fault lines and basement highs provide a control on both the underlying Plio-Pleistocene strata and modern-day drainage network. A 1:25 000 hydrogeological map and corresponding structural interpretation are presented. Analysis of catchment lithologies demonstrates the importance of grain size, porosity and age in dictating hydraulic conductivity. 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| fulltext | fulltext |
| identifier | ISSN: 0028-8306 |
| ispartof | New Zealand journal of geology and geophysics, 2019-04, Vol.62 (2), p.147-170 |
| issn | 0028-8306 1175-8791 |
| language | eng |
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| source | Royal Society of New Zealand Open Access Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Aggradation aquifer Aquifers Aquitards Attenuation Basins Catchment area Catchments Climatic cycles Drainage control Drainage network Evolution Farms Fault lines Freshwater Geological faults Glauconite Grain size Groundwater Hydraulic conductivity Hydrogeochemistry Hydrogeology hydrogeology Whanganui Basin Illite Illites Inland water environment Landscape Leaching Organic carbon Pleistocene Plio-Pleistocene Porosity Quaternary Rivers Sediments stratigraphy Terraces Water quality |
| title | Landscape evolution and hydrogeochemical characteristics of the Pourewa Stream catchment, lower North Island, New Zealand |
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