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    Wyświetlanie 1-2 z 2
    Tytuł:
    Assessment of sediment yield and conservation practices in Akaki watershed, Upper Awash Basin, Ethiopia
    Autorzy:
    Zeberie, Wondimu
    Powiązania:
    https://bibliotekanauki.pl/articles/1031690.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Akaki watershed
    ERDAS Imagine
    LULC
    MUSLE
    SWAT
    Upper Awash Basin
    sediment yield
    Opis:
    Changes in land use / land cover, coupled with poor management systems, can result in a high rate of soil erosion and increased sediment transport by changing the extent and structure of runoff and sediment yield. The purpose of this study was to assess sediment yield and conservation practices in the Akaki watershed using the Soil and Water Assessment Tool (SWAT) model. The watershed has been severely degraded due to increasing urbanization, deforestation, careless use of land and water resources that have led to soil erosion. MUSLES were used to estimate sediment yield in watersheds. SWAT has been used to delineate the watershed and to analyze the slope of the watershed, soils and land uses. In addition, ground control points, interviews and field observations were conducted to collect data on the effects of soil erosion and the status of existing conservation measures. The average annual soil loss in the study area is estimated at 2.12 tonnes / ha / year due to the high erosivity of rainfall in the region. In addition, the results showed a direct relationship between precipitation and sediment yield. Spatial variability of sediment yield was performed using simulated sediment yield results for LULC generated. Also based on the spatial outcome for critical sub-watersheds, the design and development of best management practices were proposed under different scenarios. The scenarios showed that the average annual reduction in sediment yield at the sub-basins of hot spots after the application of filter belts, terraces and stone bunds was 75.6%, 68.8% and 69.6% respectively, 4% of sediment reduction. Therefore, the placement of filter strips for the Akaki catchment should be developed and encouraged for effective sediment reduction.
    Źródło:
    World News of Natural Sciences; 2020, 28; 103-120
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The zoning of the erosion intensity and sediment yield using the geographic information systems and remote sensing, with the application of the MPSIAC model (Case study: Syazakh dam basin, Kurdistan)
    Autorzy:
    Emamgholi, M.
    Shahedi, K.
    Khaledian, V.
    Babaee, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/10759.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    erosion intensity
    sediment yield
    remote sensing
    application
    MPSIAC model
    Syazakh basin
    Kurdistan region
    Geographic Information System
    Opis:
    The aim of the present research was to estimate erosion and sediment and to formulate a map of the basin's erosion intensity using the satellite data, GIS technique and to compare the hydrometric stations' statistics. Using the Land sat satellite images among the results obtained from these data through (TM, ETM+), coverage index (NDVI) as well as a combination of bands 2, 3 and 4 for determining the type of land use and for assessing the soil texture in terms of regional aerial images tone and in accordance with the physiographic of the basin through sampling the soil texture , the map of the basin's texture was obtained. Assessing the surface and river erosion was also conducted using the aerial images and field visits. Given the data obtained and the model being applied, the special sediment rate in the basin was 5/19 tons per hectare, while the overall sediment rate obtained for the entire basin was estimated 5496533 tons in a year. Meantime, the observed and estimated value in the hydrometric station of Nesare Olya for as much as 553230 tons in a year shows a less than 1 % difference in the entire estimation of the sediments accumulated in the back of the dam while its sediment load rate estimation as much as 5/16 tons per hectare shows a 0/03 difference rate for the station.
    Źródło:
    International Letters of Natural Sciences; 2014, 04
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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