Flow Patterns and Morphological Changes in a Sandy Meander Bend during a FloodSpatially and Temporally Intensive ADCP Measurement Approach
| Autor: | Leena Laamanen, Petteri Alho, Eliisa Lotsari, Elina Kasvi |
|---|---|
| Přispěvatelé: | Department of Geographical and Historical Studies / Geography, University of Turku, State Forest Enterprise, University of Eastern Finland, Department of Built Environment, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
fluvial processes
lcsh:Hydraulic engineering 010504 meteorology & atmospheric sciences river 0208 environmental biotechnology Geography Planning and Development Flow (psychology) ta1172 ta1171 Fluvial 02 engineering and technology Aquatic Science 01 natural sciences Biochemistry Flow measurement lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 fluvial geomorphology Fluvial geomorphology meandering river Geomorphology ta119 0105 earth and related environmental sciences Water Science and Technology River lcsh:TD201-500 geography geography.geographical_feature_category Flood myth ta114 Fluvial processes Point bar ADCP flow measurement 6. Clean water 020801 environmental engineering Meandering river Erosion Meander Geology Channel (geography) |
| Zdroj: | Water; Volume 9; Issue 2; Pages: 106 Water, Vol 9, Iss 2, p 106 (2017) |
| ISSN: | 2073-4441 |
| Popis: | The fluvio-geomorphological processes in meander bends are spatially uneven in distribution. Typically, higher velocities and erosion take place near the outer bank beyond the bend apex, while the inner bend point bar grows laterally towards the outer bank, increasing the bend amplitude. These dynamics maintain the meander evolution. Even though this development is found in meandering rivers independent of soil or environmental characteristics, each river still seems to behave unpredictably. The special mechanisms that determine the rate and occasion of morphological changes remain unclear. The aim of this study is to offer new insights regarding flow-induced morphological changes in meander using a novel study approach. We focused on short-term and small-spatial-scale changes by conducting a spatially and temporally (daily) intensive survey during a flood (a period of nine days) with an ADCP attached to a remotely controlled mini-boat. Based on our analysis, the flood duration and the rate of discharge increase and decrease seems to play key roles in determining channel changes by controlling the flow velocities and depth and the backwater effect may have notable influence on the morphological processes. We discuss themes such as the interaction of inner and outer bend processes and the longer-term development of meander bends. published version peerReviewed |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|