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Volume 7 - Autumn 1980

Contents

Page 6 of 10

Conferences & Meetings

Short Communications: Reports, Comments, News, Notes

Conferences & Meetings

Short Communications: Reports, Comments, News, Notes

Conferences & Meetings

Main Papers

  • Long-term Consequences of Upstream Impoundment

  • Geoffrey E. Petts
  • Published online by Cambridge University Press:
    24 August 2009, pp. 325-332

  • Since 1970 a large number of environmental problems have been identified as resulting from the long-term effects of human impacts. Consideration of human activity within the environment as three orders of impact, provides a basic framework for the appreciation and evaluation of long-term problems. Consequent upon dam construction, major changes of flood magnitude and frequency and of the quantity and calibre of sediment loads (first-order impacts), will induce the readjustment of channel morphology and ecology (second-order impacts). However, the macrophytic and macro-invertebrate population, for example, are also adjusted to channel morphology—particularly channel shape and substrate composition—so that further readjustments of the macrophyte and macro-invertebrate populations may be effected by changes of channel form (third-order impacts).

Short Communications: Reports, Comments, News, Notes

Conferences & Meetings

Short Communications: Reports, Comments, News, Notes

Conferences & Meetings

Short Communications: Reports, Comments, News, Notes

Main Papers

  • Local Weather and Air Pollution Potential: The Case of Durban

  • Robert A. Preston-Whyte, Roseanne D. Diab
  • Published online by Cambridge University Press:
    24 August 2009, pp. 241-244

  • Atmospheric pollution over cities accumulates under light wind or stagnation conditions and, on occasion, may be supplemented by transport from distant sources. These conditions cannot easily be predicted by use of the average weather elements. However, material which is useful to decision-makers who are concerned with air pollution problems can be obtained by presenting the data, as in the case of Durban, South Africa, first in terms of the nature and characteristics of vertical mixing in the lower atmosphere, and secondly in terms of the horizontal transport of air. In this way the nature and characteristics of surface and non-surface inversions and mixingdepths, as well as of macro- and meso-scale atmospheric circulations, can more easily be appreciated. In addition, a measure of the air pollution potential can be obtained from daily maximum mixing-depth and win-speed values.

Reviews & Notices

Conferences & Meetings

Reviews & Notices

Conferences & Meetings

Page 6 of 10