Articles by Keyword: Surface Waters

Search results for Surface Waters

We found 41 results for you
  1. Heavy metals in the water and sediments of Oued Es-Souk, Algeria, a river receiving acid effluents from an abandoned mine

    Heavy metals in the water and sediments of Oued Es-Souk, Algeria, a river receiving acid effluents from an abandoned mine

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The Sidi Kamber Mine, abandoned since 1976, is still a source of acidic drainage entering the Oued Es-Souk River. An investigation of the rate of pollution of the Oued Es-Souk and the variation of its water quality showed that the...
  2. Contrasting hydrography and phytoplankton distribution in the upper layers of cyclonic eddies in the Mozambique Basin and Mozambique Channel

    Contrasting hydrography and phytoplankton distribution in the upper layers of cyclonic eddies in the Mozambique Basin and Mozambique Channel

    Item type: Journal Article • Journal: African Journal of Marine Science
    Hydrographic data collected in cyclonic eddies in the Mozambique Channel and Basin revealed notable differences in temperature and salinity at a depth of 100 m, the upper mixed layer, the nitracline depths, and vertical distribution of chlorophyll-a (Chl-a). Differences in...
  3. Environmental influence on phytoplankton communities in the northern Benguela ecosystem

    Environmental influence on phytoplankton communities in the northern Benguela ecosystem

    Item type: Journal Article • Journal: African Journal of Marine Science
    An investigation of surface phytoplankton communities was undertaken on the shelf of the northern Benguela upwelling ecosystem during austral autumn (May) and spring (September), along latitudinal transects at 20° S and 23° S, from 2 to 70 nautical miles offshore,...
  4. Grondgeassosieerde, lineêre plantegroeipatrone in die Warmbadomgewing van die Limpopo-provinsie van Suid-Afrika

    Grondgeassosieerde, lineêre plantegroeipatrone in die Warmbadomgewing van die Limpopo-provinsie van Suid-Afrika

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Lineêre mikroreliëfverskynsels wat op lugfoto's soos vingerafdrukpatrone vertoon en bestaande uit boomryke kruine en grasryke trôe is op die voethang van die Baviaansberg, Warmbadomgewing (Suid-Afrika) beskryf. Vir die doel om die oorsprong van die verskynsels te verklaar is van 'n...
  5. Estimation of frost occurrence and duration of frost for a short-grass surface

    Estimation of frost occurrence and duration of frost for a short-grass surface

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The estimation of frost duration (FD) was investigated using dielectric, infrared surface temperature and grass temperature subhourly measurements. Near real-time FD data and information displays and alerts were also made available via a web-based system. FD was estimated using a...
  6. Estimation of leaf wetness duration for a short-grass surface

    Estimation of leaf wetness duration for a short-grass surface

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The measurement of leaf wetness duration (LWD) was investigated using subhourly dielectric, infrared surface temperature, dewpoint temperature, grass temperature and relative humidity (RH) measurements. Near real-time LWD data and information displays and alerts were made available timeously via a web-based...
  7. THE DETERMINATION OF CHLOROPHYLL <underline>a</underline> IN WATER CONTAINING SEDIMENT

    THE DETERMINATION OF CHLOROPHYLL <underline>a</underline> IN WATER CONTAINING SEDIMENT

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The presence of sediment at concentrations of 0,2% by mass in water samples significantly lowered the amount of chlorophyll a that could be measured. Two types of sediment differed in their ability to lower the chlorophyll a concentration. The chemically...
  8. RATE OF EROSION IN THE CATCHMENT OF THE BULBERGFONTEIN DAM NEAR REDDERSBURG IN THE ORANGE FREE STATE

    RATE OF EROSION IN THE CATCHMENT OF THE BULBERGFONTEIN DAM NEAR REDDERSBURG IN THE ORANGE FREE STATE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The volume of sediment in the Bulbergfontein Dam was computed after mapping the area of the dam and ascertaining the depth of the sediment by digging and augering. The watershed of the impoundment had been delimited by means of aerial...
  9. PHYSICAL, CHEMICAL AND BIOTIC RESPONSES TO DECREASING WATER DEPTH IN A HIGHVELD PAN FOLLOWING WET AND DRY SUMMERS

    PHYSICAL, CHEMICAL AND BIOTIC RESPONSES TO DECREASING WATER DEPTH IN A HIGHVELD PAN FOLLOWING WET AND DRY SUMMERS

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The classification of highveld pans by Geldenhuys (1982) emphasized the spatial diversity of morphology, vegetation and fauna. However, since the characteristics of individual pans also change seasonally and over longer term wet/dry cycles, he called for more detailed limnological studies...