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Wpływ urbanizacji na ładunek osadów w tropikalnych zlewniach analizowany na podstawie zmian użytkowania ziemi i w oparciu o model GIS
Języki publikacji
Abstrakty
Abundant rainfall areas promote sediment yield at both sub-watershed and watershed scale due to soil erosion and increase siltation of river channel, but it can be curtailed through planned urbanization. The urbanization of Skudai watershed is analysed from historical and future perspective. A GIS-based model (Hydrological Simulation Programme-FORTRAN-HSPF) is used to modelled sediment flow using basin-wide simulation, and the output result is utilized in evaluating sediment yield reduction due to increased urbanization by swapping multiple temporal land-use of decadent time-steps. The analysis indicates that sediment yield reduces with increase urban built-up and decrease forest and agricultural land. An estimated 12 400 tons of sediment will be reduced for every 27% increase in built-up areas under high rainfall condition and 1 490 tons at low rainfall. The sensitivity analysis of land-use classes shows that built-up, forest and barren are more sensitive to sediment yield reduction compared to wetland and agricultural land at both high and low rainfall. The result of the study suggests that increased urbanization reduced sediment yield in proportion to the rainfall condition and can be used as an alternative approach for soil conservation at watershed scale independent of climate condition.
Duże opady atmosferyczne sprzyjają przemieszczaniu się osadów w skali zlewni w wyniku erozji gleby, powodując zamulanie koryta rzecznego. Procesy te można ograniczyć przez planową urbanizację. Urbanizację zlewni Skudai analizowano w perspektywie historycznej (przedziały 10-letnie) i w kontekście przyszłych zmian. Do modelowania przepływu osadu użyto programu symulacji hydrologicznej Fortran (HSPF), a wyniki modelowania wykorzystano do oceny zmniejszenia ilości osadu związanej z urbanizacją. Analiza wskazuje, że ładunek osadów maleje ze zwiększeniem udziału zabudowy miejskiej oraz z ograniczeniem powierzchni lasów i gruntów rolniczych. W warunkach intensywnych opadów ładunek osadu może zmaleć o 12 400 t, gdy udział terenów zabudowanych zwiększy się o 27%. W warunkach małych opadów ładunek zmniejszy się o 1 490 t. Analiza wrażliwości klas użytkowania ziemi wykazała, że obszary zabudowane, lasy i ugory są bardziej wrażliwe na zmniejszenie ładunku osadu niż obszary podmokłe i grunty rolnicze, zarówno w warunkach dużego jak i małego natężenia opadów. Wyniki badań sugerują, że zwiększony udział terenów zabudowanych ogranicza ładunek osadów proporcjonalnie do ilości opadów, w związku z czym planowa urbanizacja może być wykorzystana jako alternatywne podejście do ochrony gleb w skali zlewni, niezależnie od warunków klimatycznych.
Wydawca
Czasopismo
Rocznik
Tom
Strony
33--45
Opis fizyczny
Bibliogr. 40 poz., rys., tab.
Twórcy
autor
- Universiti Teknologi Malaysia, Faculty of Civil Engineering, Department of Hydraulics and Hydrology, Skudai, 81300 Johor Bahru, Malaysia
autor
- Universiti Teknologi Malaysia, Faculty of Civil Engineering, Department of Hydraulics and Hydrology, Skudai, 81300 Johor Bahru, Malaysia
autor
- Universiti Teknologi Malaysia, Faculty of Civil Engineering, Department of Hydraulics and Hydrology, Skudai, 81300 Johor Bahru, Malaysia
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-44d0267a-7c31-4545-8fa2-729ef040d055