Sökning: "catchment erosion"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden catchment erosion.

  1. 1. Waterborne sediment and pollutant transport into lakes and accumulation in lake sediments

    Författare :Gull Olli; Gia Destouni; Ingmar Renberg; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Catchment; environmental projects; erosion; eutrophication; phosphorous transport and retention; soil transport; sediment accumulation; Physical geography; Naturgeografi; Physical Geography; naturgeografi;

    Sammanfattning : The general objective of this thesis is to contribute to the knowledge of the transport of sediments and pollutants from catchments to downstream water recipient systems and their accumulation in these systems, such as lakes and lake sediments. One part of the thesis studies the importance of drainage reach morphology and water flow for the phosphorous (P) transport and retention in the reaches, and the main controlling processes of the P retention in the reach sediments. LÄS MER

  3. 2. Temporal and spatial variations of soil degradation in Mwisanga Catchment, Kondoa, Tanzania

    Författare :Pius Zebhe Yanda; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Soil degradation; and degradation; Tanzania; Erosion; Kondoa; Tanzania;

    Sammanfattning : .... LÄS MER

  4. 3. The sensitivity of Swedish alpine lakes to hydro-climatic changes during the Late Holocene

    Författare :Annika Berntsson; Gunhild Rosqvist; Peter G. Langdon; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; alpine lake sediments; temperature reconstruction; precipitation; catchment erosion; chironomids; oxygen isotopes; XRF core scanning; geomorphology; grain size analysis; kvartärgeologi; Quaternary Geology;

    Sammanfattning : The thesis objective is to use lake sediments to investigate the relationships between chironomids, as proxy for temperature, and δ18O and minerogenic in-wash, as precipitation proxies, in northern Sweden during the Late Holocene. Three lakes along a N–S transect in the Scandes were studied using biological, geochemical and physical sediment properties, together with numerical methods. LÄS MER

  5. 4. Water erosion modeling using fractal rainfall disaggregation- a study in semiarid Tunisia

    Författare :Sihem Jebari; Avdelningen för Teknisk vattenresurslära; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; reservoir siltation; regionalization; fractal analysis; Atlasic mountain range; erosive events; semiarid area; soil loss; Tunisia.; Soil erosion; semiarid; Tunisia; rainfall; fractal; diaggregation;

    Sammanfattning : In the Tunisian semiarid area, water erosion processes have led to negative economic and environmental consequences in a context of limited water resources. To characterize and predict these degradation phenomena, a comprehensive high-resolution data base on erosive rainfall, together with siltation records for 28 small reservoirs were analyzed. LÄS MER

  7. 5. Risk assessment of erosion and losses of particulate phosphorus : a series of studies at laboratory, field and catchment scales

    Författare :Ana Villa Solis; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Phosphorus (P) losses from agricultural land are considered a major contributor to eutrophication in many aquatic ecosystems. Areas more vulnerable to losses of P need to be identified in order to effectively apply mitigation measures aimed at reducing total loads of P. LÄS MER