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    Wyświetlanie 1-3 z 3
    Tytuł:
    Application of the USBR equation for surveying balance of sediment yield in Dez River branches in Iran
    Autorzy:
    Fuladipanah, M.
    Makvandi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/208109.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sediments
    rivers
    osady rzeczne
    rzeki
    Opis:
    Accurate determination of mean annual sediment load (MASL) of natural rivers will affect administrative aspects of water planning in dams. The MASL in Dez River in the southwest Iran has been considered. Sezar and Bakhtiari are its two branches. The amount of MASL was predicted by the USBR equation with three scenarios: using mean value of sediment discharge, using probabilistic classification of river flow data and using separation of wet and dry months. The results show that the USBR equation can be used to evaluate MASL in the Dez basin.
    Źródło:
    Environment Protection Engineering; 2013, 39, 3; 185-195
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of waste assimilative capacity (WAC) of rivers located within the Desaru Region, Joho
    Autorzy:
    Zainudin, Z.
    Azmi, A. S.
    Jimat, D. N.
    Jamal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/206928.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    water contamination
    BOD5
    water pollution
    rivers
    zanieczyszczenie rzek
    BZT5
    zanieczyszczenie wody
    rzeki
    Opis:
    Desaru is a popular tourist destination located on the east coast of the state of Johor. The area has been identified for further development to enhance tourism. This presents a pollution risk to its surrounding watercourses. The purpose of this study was to assess the potential risk of contamination towards rivers located in the crux of the development region, namely the Terumpah, Che Minah, Semangar, Beluntu, Penawar Besar, and Mertang Besar Rivers. Water quality and hydraulic measurements were made at these rivers, with the intention of developing a numerical model. The model results showed deterioration in BOD5 and NH3-N in the Semangar River, up to 4.0 mg/dm3 and 0.34 mg/dm3, respectively. The Beluntu River experienced the highest degradation, to about 14.0 mg/dm3 of BOD5 and 0.8 mg/dm3 of NH3-N. The waste assimilative capacity (WAC) for the Matang Besar, Che Minah and Beluntu Rivers were very limited, with a class III BOD5 limit of 15, 43, and 10 kg/day, respectively, whereas the Terumpah River is not able to accept any BOD load without breaching the same threshold.
    Źródło:
    Environment Protection Engineering; 2015, 41, 4; 49-60
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of mineral and organic nitrogen forms in regulated and restored sections of a small lowland river
    Autorzy:
    Zieliński, P.
    Jekatierynczuk-Rudczyk, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/207979.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    water resources
    banks
    biogeochemistry
    floods
    minerals
    nitrogen
    restoration
    rivers
    zasoby wodne
    zbiorniki wodne
    biogeochemia
    powodzie
    minerały
    azot
    renowacja koryta rzeki
    rzeki
    meandryzacja koryta rzeki
    regulacja rzeki
    Opis:
    The lower, ending part of a small lowland Rudnia River (RR) in NE Poland was restored in 1999 and transformed into a meandering river. In this study, a few years after the natural connection between the main channel and its historic floodplain was restored, we examined the impact of river channel restoration on nitrogen dynamics and its biogeochemistry. Data were collected over a period of a year at monthly intervals from two sections of the river located on the regulated and restored sections. Spatial and temporal variations in the occurrence of mineral (NH(+4), NO(-2), NO(-3) and organic forms of nitrogen were investigated. Much higher average concentrations of organic nitrogen forms were found in the water from the restored part of the river than in the regulated one. Mineral nitrogen contribution to the total nitrogen (TN) pool was the highest, and the total organic nitrogen (TON) to total inorganic nitrogen (TIN) ratio exceeded 2 mg•dm-3 in the restored river section. The seasonal trend in concentration of organic nitrogen forms for the restored section was higher and statistically significantly different from the data recorded at the regulated river section. Geological, hydrological, and biogeochemical factors caused elevated organic nitrogen concentrations in the water at the restored part. The most important environmental parameters for nitrogen dynamics are geological structure of river valley, formation and condition of river banks ecotone zone, and water retention time in the river channel. Results from this study suggest that properly restored lowland river floodplains can be effective nitrate sink for mineral forms of nitrogen.
    Źródło:
    Environment Protection Engineering; 2014, 40, 2; 33-46
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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