Recently increased erosion and sediment transport rates in the upper Waipawa River Basin, Ruahine Range, New Zealand / Patrick J. Grant.

By: Grant, P. J. (Patrick John), 1923-.
Contributor(s): Soil Conservation Centre (Aokautere, N.Z.) | National Water and Soil Conservation Organisation (N.Z.).
Material type: materialTypeLabelBookSeries: Publication (Soil Conservation Centre, Aokautere, N.Z.): no. 5Publisher: Palmerston North, N.Z. : Soil Conservation Centre, Aokautere, Ministry of Works and Development for the National Water and Soil Conservation Organisation, 1983Description: viii, 127 p. : 24 ill. (1 col.), maps, 5 tables ; 30 cm.ISSN: 0111-7971.Subject(s): NEW ZEALAND | NZMS260V22 | NZMS260U22 | WATER EROSION | EROSION CONTROL | SOIL EROSION | GEOLOGIC PROCESSES | RAINFALL | CLIMATIC CHANGES | SEDIMENTS | NZMS262 07 | WAIPAWA RIVER | RUAHINE RANGE | EROSION | SEDIMENT TRANSPORT | SEDIMENTATION | CLIMATIC INFLUENCESHoldings: GRETA POINT: 551.311.21(931.251) GRA
Contents:
Introduction -- A. Upper Waipawa River Basin features -- A1 General features -- A2 sediment supply areas -- A3 Geology and erosion -- A4 Erosion and sedimentation history -- A5 Erosion processes -- A6 Current sedimentation -- B. Major influences on the Basin and their changes with time -- B1 Air temperature -- B2 Rainstorms and floods -- B3 Drought -- B4 Earthquakes -- B5 Clearance of vegetation -- B6 Wild animals -- C. Effects on Basin features of changing influences with time -- C1 Effects on vegetation -- C2 Effects on erosion processes -- C3 Effects on channel sedimentation -- D. Final discussions and conclusions -- D1 Waipawa erosion period -- D2 Preveious erosion periods D3 Climate regime models and screes -- D4 An outline management rationale -- E. General summary -- Acknowledgements -- References -- List of figures -- List of tables.
Abstract: In the upper Waipawa River basin, North Island, New Zealand, there have been increased rates of several erosion processes since about AD 1950. Major sediment supplies come from sandstone-argillite areas, above 1000 m altitude, which have supplied sediment during previous erosion periods and where annual rainfall exceeds 4000 mm. The recent increased erosion rates have resulted from changes in temperature and precipitation (rainfall and snowfall) which were linked to wide-scale changes of atmospheric circulation in the south-west Pacific region. The increased magnitude of major rainstorms associated with recent atomospheric warming has resulted in greater fluvial erosion rates. Increased flood frequency and magnitude have greatly increased channel sediment transport. These changes have resulted in channel aggradation, widening, straightening and steepening, and increased erosion of riparian slopes. The control of sediment in the headwaters is not considered to be feasible. The down stream sedimentation problem should be tackled in the problem area itself. (auth)
Holdings
Item type Current library Call number Copy number Status Date due Barcode
BOOK BOOK WELLINGTON BOOKS 551.311.21(931.251) GRA 1 Available B019328

Bibliography: p. 122-127.

Introduction -- A. Upper Waipawa River Basin features -- A1 General features -- A2 sediment supply areas -- A3 Geology and erosion -- A4 Erosion and sedimentation history -- A5 Erosion processes -- A6 Current sedimentation -- B. Major influences on the Basin and their changes with time -- B1 Air temperature -- B2 Rainstorms and floods -- B3 Drought -- B4 Earthquakes -- B5 Clearance of vegetation -- B6 Wild animals -- C. Effects on Basin features of changing influences with time -- C1 Effects on vegetation -- C2 Effects on erosion processes -- C3 Effects on channel sedimentation -- D. Final discussions and conclusions -- D1 Waipawa erosion period -- D2 Preveious erosion periods D3 Climate regime models and screes -- D4 An outline management rationale -- E. General summary -- Acknowledgements -- References -- List of figures -- List of tables.

In the upper Waipawa River basin, North Island, New Zealand, there have been increased rates of several erosion processes since about AD 1950. Major sediment supplies come from sandstone-argillite areas, above 1000 m altitude, which have supplied sediment during previous erosion periods and where annual rainfall exceeds 4000 mm. The recent increased erosion rates have resulted from changes in temperature and precipitation (rainfall and snowfall) which were linked to wide-scale changes of atmospheric circulation in the south-west Pacific region. The increased magnitude of major rainstorms associated with recent atomospheric warming has resulted in greater fluvial erosion rates. Increased flood frequency and magnitude have greatly increased channel sediment transport. These changes have resulted in channel aggradation, widening, straightening and steepening, and increased erosion of riparian slopes. The control of sediment in the headwaters is not considered to be feasible. The down stream sedimentation problem should be tackled in the problem area itself. (auth)

GRETA POINT: 551.311.21(931.251) GRA

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