Analysis of prognosis of lowland river bed erosion based on geotechnical parameters

• Autorzy: Smaga A.

Identyfikatory

DOI

10.1515/sgem-2015-0045

• Języki publikacji: EN

Abstrakty

EN

The river erosion is a complex process, the dynamics of which is very difficult to predict. Its intensity largely depends on hydraulic conditions of the river channel. However, it is also thought that natural resistance of the subsoil has a great influence on the scale of the erosion process. Predicting the effects of this process is extremely important in the case of constructing a piling structure (for example, artificial reservoirs). The partition of the river channel causes significant lowering of the river channel bed downstream the dam which threatens the stability of hydro technical and engineering (bridges) buildings. To stop this unwanted phenomenon, stabilizing thresholds are built. However, random location of thresholds significantly reduces their effectiveness. Therefore, taking under consideration natural geotechnical conditions of the subsoil appears to be extremely important. In the light of the current development of in-situ tests in geotechnics, an attempt to use results from these tests to predict the bed erosion rate was made. The analysis includes results from CPTU and DPL tests, which were carried out in the Warta River valley downstream the Jeziorsko reservoir. In the paper, the general diagrams for the procedure of obtaining and processing the data are shown. As a result, the author presents two multidimensional bed erosion rate models built based on hydraulic data and results from CPTU or DPL tests. These models allow taking more effective actions, leading to the neutralization of the effects of the intensive bed erosion process.

Słowa kluczowe

EN

CPTU; relative density; bed erosion; river flow

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2015
• Tom: Vol. 37, nr 4
• Strony: 57--63
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Smaga A.

• Adam Mickiewicz University, Department of Engineering Geology and Geotechnics, Poznań, Poland. Institute of Geology, Collegium Geologicum, ul. Maków Polnych 16, 61-606 Poznań

Bibliografia

• [1] BRIAUD J.-L., CHEN H.-C., NURTJAHYO Y., LI P., WANG J., Complex pier scour and contraction scour in cohesive soils, Transportation Research Board National Research Council. (NCHRP REPORT 24–15, 2003).
• [2] JACOBS W., LE HIR P., VAN KESTEREN W., CANN P., Erosion threshold of sand – mud mixtures, Continental Shelf Research, 2011, 31, 14–25. DOI: 10.1016/j.crs.2010.05.012.
• [3] MŁYNAREK Z., Czynniki wpływające na opór stożka podczas statycznego sondowania gruntów spoistych, Poznań: Roczniki Akademii Rolniczej, 1978.
• [4] Polish standards committee. (2002). Geotechnika – Badania polowe, PN-B-04452, Poland.
• [5] ROBERTSON P.K., Interpretation of cone penetration tests – a unified approach, Canadian Geotechnical Journal, 2009, 46 (11), 1337–1355, DOI: 10.1139/T09-065.
• [6] WIERZBICKI J., STEFANIAK K., Ocena wpływu struktury i tekstury gruntu niespoistego na opór stożka w badaniu CPTU, [in:] E. Dembicki, M.K. Kumor, Z.M. Lechowicz (eds.), Problemy geotechniczne i środowiskowe z uwzględnieniem podłoży ekspansywnych, Wydawnictwa Uczelniane UTP, Bydgoszcz, 2009, 117–128.
• [7] WIERZBICKI M., HÄMMERLING M., PRZEDWOJSKI B., Wpływ budowy progów stabilizujących na kształtowanie się układu zwierciadła wody i dna poniżej zbiornika Jeziorsko, Gospodarka Wodna, 2011, 6, 239–243.
• [8] YONG HUI Z., JIN YOU L., HONG ZHI L., JIA SHENG W., BEI LIN F., SHI MING Y., (2008), Research on cohesive sediment erosion by flow: An overview. Science in China Series E: Technological Sciences. 51(11), 2001–2012, DOI: 10.1007/s11431- 008-0232-4.
• [9] ZIELIŃSKI T., Sedymentologia. Osady rzek i jezior, Wydawnictwo Naukowe Uniwersytetu im. Adama Mickiewicza w Poznaniu, Poznań, 2014.