Sediment load estimation in the Mellegue catchment, Algeria

• Autorzy: Selmi K. , Khanchoul K.

Identyfikatory

DOI

10.1515/jwld-2016-0044

Warianty tytułu

PL

Ocena ładunku osadów w zlewni rzeki Mellegue, Algieria

• Języki publikacji: EN

Abstrakty

EN

Soil erosion by water and the impact of sediment transport on lakes and streams, can seriously degrade soil and create problems for both agricultural land and water quality. The present study has been carried out to assess suspended sediment yield in Mellegue catchment, northeast of Algeria. Regression analysis was used to establish a relationship between the instantaneous water discharge (Q) and the instantaneous suspended sediment concentration (C) based on all recorded data and seasonal ratings for the period 1970–2003. The regression technique used in this paper involved a division of data into discharge – based classes, the mean concentrations and discharges of which are used to develop power regressions, according to single and season ratings, through logtransformation. Sediment loads estimated by stratified rating curves reduced underestimations to a range from 2 to 4%. The mean annual sediment yield during the 34 years of the study period was 589.23 t∙km^–2∙y^–1. Sediment transport is dominated by fall rainstorms accounting for 41% of the annual load. The big supply of sediment during this season confirms the intense geomorphic work by fall storms caused by high intensity rainfall and low vegetation cover.

PL

Erozja wodna gleby i wpływ transportu osadów na rzeki i jeziora może znacząco degradować gleby i stwarzać problemy zarówno na obszarach rolniczych, jak i dla jakości wód. Przedstawione badania prowadzono celem oceny zawiesiny wytworzonej w zlewni rzeki Mellegue w północno-wschodniej Algierii. Analizę regresji użyto do ustalenia zależności pomiędzy chwilowym odpływem wody Q a chwilowym stężeniem zawiesiny C na podstawie wszystkich zebranych danych i przedziałów sezonowych dla lat 1970–2003. Regresje zastosowane w tych badaniach uwzględniały podział danych na klasy bazujący na wielkości odpływu. Średnie stężenia i wielkości odpływu w poszczególnych klasach wykorzystano do skonstruowania funkcji wykładniczej poprzez transformację logarytmiczną. Ładunki osadu ustalone na podstawie stratyfikowanych krzywych natężenia przepływu wykazywały niedoszacowanie w zakresie 2–4%. Średni roczny ładunek wytworzonych osadów dla okresu 34 lat badań wynosił 589.23 t∙km^–2. Transport osadów był spowodowany jesiennymi ulewnymi opadami, które odpowiadały za 41% rocznych ładunków. Duża dostawa osadów w tym okresie potwierdza intensywną aktywność geomorfologiczną jesiennych sztormów wywołaną silnymi opadami i ubogą pokrywą roślinną.

Słowa kluczowe

EN

erosion; Mellegue watershed; sediment rating curves; sediment transport; suspended sediment concentration

PL

erozja; zlewnia Mellegue; krzywe natężenia przepływu zawiesiny; transport osadów; stężenie zawiesiny

• Wydawca: Wydawnictwo ITP
• Czasopismo: Journal of Water and Land Development
• Rocznik: 2016
• Tom: no. 31
• Strony: 129--137
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Selmi K.

• Laboratory of Soils and Sustainable Development, Badji Mokhtar University-Annaba, Algeria

autor

Khanchoul K.

• Laboratory of Soils and Sustainable Development, Badji Mokhtar University-Annaba, Algeria

Bibliografia

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).