Role of flood discharge in shaping stream geometry: Analysis of a small modern stream in the Uinta Basin, USA
Guang-Ming Hu a, b, Ru-Xin Dingc, d, Yan-Bing Li e, Jing-Fu Shan a, Xiao-Tao Yu a, Wei Feng a
a School of Geosciences, Yangtze University, Wuhan 430100, Hubei, China b State Key Laboratory of Petroleum Resources, Prospecting, China University of Petroleum, Beijing 102249, China c School of Earth Science, Geological Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, China d Guangdong Provincial Key Laboratory of Mineral Resources, Geological Processes, Guangzhou 510275, Guangdong, China e The Third Production Plant, Daqing Oilfield Branch, PetroChina, Daqing 163000, Heilongjiang, China
Abstract This small modern river system is located on a relatively flat (about 1°-2°), unconsolidated sandy pediment surface in the Uinta Basin of Utah, USA, and it is with a scale of about 30 m long and 0.4-0.8 m wide, similar as a natural flume experiment model. The small stream is informally divided into upstream, midstream and downstream. The analysis shows that flood discharge influences channel sinuosity and morphology to produce an initial meandering pattern which is later changed to a braided and then a straight pattern in the downflow direction. The upstream segment has a high sinuous geometry dominated by both erosion (cutbanks) and deposition (point bars). In the resistance of sporadic vegetation rooting in banks, the upstream flood deviates its original direction, which results in the powerful flood intensively eroding the cutbank and accreting clastics to build point bars, and thus producing a high sinuous channel. The midstream is dominated by deposits (many small bars) with a moderate to low sinuosity. Due to the bad drainage of the high sinuous channel in the upstream, the strong flood can cut off the point bar completely or even surmount the levee in the last meandering upstream, which widens the channel suddenly with a quick decreasing current power. Then, the clastics from the upstream are unloaded in the midstream and form many small bars. Unloaded sediments protect the bank, and the low-power current brings a moderate erosion to the bank, which forms a moderate to low sinuous channel in the midstream. The downstream shows multistage erosional terraces in its relatively straight channels. After the midstream water drops its load, it becomes “clear” and reaches downstream, the lower current power is helpless to reform channel geometry. Thus, the downstream channel segment keeps a lower sinuous geometry, even straight partially. Small amounts of fine clastics are deposited, and simultaneously multistage terraces are formed due to regressive flood erosion.This stream example demonstrates the subtleties of stream flow and the importance of flood discharge in shaping the channel geometry. Although it is difficult to scale up this example to a large river system that carves geomorphic landscape, this case shows how river geometries vary from the traditional patterns due to different gradient.
Corresponding Authors:
Email:hugm1214@163.com,hugm@yangtzeu.edu.cn (G. M. Hu).
Cite this article:
. Role of flood discharge in shaping stream geometry: Analysis of a small modern stream in the Uinta Basin, USA[J]. Journal of Palaeogeography, 2017, 6(1): 84-95.
. Role of flood discharge in shaping stream geometry: Analysis of a small modern stream in the Uinta Basin, USA[J]. Journal of Palaeogeography, 2017, 6(1): 84-95.
Boggs, Jr.S., 2012. Principle of Sedimentology and Stratigraphy (5 th Edition). Pearson Prentice Hall, New Jersey, U.S.A., pp. 216-217.
[2]
Bridge, J.S., 1993. The interaction between channel geometry, water flow, sediment transport and deposition in braided rivers, in: Best, J.L., Bristow, C.S. (Eds.), Braided Rivers. Geological Society of London, Special Publication 75, Bath, London, U.K., pp. 3-72.
[3]
Bridge, J.S., 2003. Rivers and Floodplains. Blackwell Science Ltd., Oxford, U.K., pp. 153-157.
Davies, S.J., Gibling, M.R., 2011. Evolution of fixed-channel alluvial plains in response to Carboniferous vegetation. Nature Geoscience , 4, 629-633.
[6]
Friedkin, J.F., 1945. A Laboratory Study of the Meandering of Alluvial Rivers. Mississippi River Commission, Vicksburg, Mississippi, U.S.A., p. 16.
[7]
Friend P.F., Sinha R., 1993. Braiding and meandering parameters, in: Best J.L., Bristow C.S. (Eds)., Braided Rivers. Geological Society, London, Special Publication , vol. 75, pp. 105-111.
[8]
Gillies, R.R., Ramsey, R.D., 2009. Climate of Utah, in: McGinty, E.I.L. (Ed.), Rangeland Resources of Utah. Utah State University, Utah, U.S.A., pp. 39-45.
[9]
Ielpi, A., Gibling, M.R., Bashforth, A.R., Lally, C., Rygel, M.C., Al-Silwadi, S., 2014. Role of vegetation in shaping Early Pennsylvanian braided rivers: Architecture of the Boss Point Formation, Atlantic Canada. Sedimentology , 61(6), 1689-1691.
[10]
Knighton, A.D., 1998. Fluvial Forms and Processes: A New Perspective. Arnold, London, U.K., pp. 220-232.
[11]
Leopold, L.B., Wolman, M.G., 1957. River channel patterns: Braided, meandering, and straight. US Geological Survey Professional Paper , 282(B), 72-73.
[12]
Leopold L.B., Wolman M.G., Miller J.P., 1964. Fluvial Processes in Geomorphology. W.H. Freeman and Co., San Francisco, pp. 292-295.
[13]
Ma, Z., Xu, Y., Li, J., 2005. River fractal dimension and the relationship between river fractal dimension and river flood: Case study in the middle and lower course of the Yangtze River. Advance in Water Science , 16(4), 530-533 (in Chinese with English abstract).
[14]
Miall, A.D., 1977. A review of the braided-river depositional environment. Earth-Science Review , 13(1), 1-62.
[15]
Nichols, G., 2009. Sedimentology and Stratigraphy (2 nd Edition). John Wiley and Sons, Ltd., Oxford. U.K., pp. 131-132.
[16]
Ramsey, R.D., West, N.E., 2009. Vegetation of Utah, in: McGinty, E.I.L. (Ed.), Rangeland Resources of Utah. Utah State University, Utah, U.S.A., p. 53.
[17]
Ramsey, R.D., Banner, R.E., McGinty, E.I.L., 2009. Watershed basin of Utah, in: McGinty, E.I.L. (Ed.), Rangeland Resources of Utah. Utah State University, Utah, U.S.A., p. 30.
[18]
Rosgen, D.L., 1994. A classification of natural rivers. Catena , 22, 169-199.
[19]
Rust, B.R., 1978. A classification of alluvial channel systems, in: Miall, A.D. (Ed.), Fluvial Sedimentology. Canadian Society Petroleum Geologist Memoir 5, pp. 187-198.
[20]
Schumm, S.A., 1977. The Fluvial System. John Wiley and Sons, Ltd., New York, U.S.A., pp.106-121.
[21]
Schumm, S.A., 1968. River adjustment to altered hydrologic regimen, Murrumbidgee River and paleochannels, Australia. US Geological Survey Professional Paper , 598, 65p.
[22]
Schumm S.A., 1981. Evolution and response of the fluvial system: Sedimentological implications, in: Ethridge F.G., Flores R.M., (Eds.), Recent and Ancient Nonmarine Depositional Environments: Models for Exploration. The Society of Economic Paleontologists and Mineralogists , Special Publication , vol. 31, pp. 19-29.
[23]
Shao, X., Wang, X., 2013. Introduction to River Mechanics (2 nd Edition). Tsinghua University Press, Beijing, China, pp.78-97 (in Chinese).
[24]
Sundborg, A., 1956. The River Klarälven: A study of fluvial processes. Geografiska Annaler , 38(2), 197.
[25]
Tal, M., Paola, C., 2007. Dynamic single-thread channels maintained by the interaction of flow and vegetation. Geology , 35, 347-350.
[26]
Xu, G. 2013. Special Topics on River Dynamics. China Water Power Press, Beijing, China, pp. 146-147 (in Chinese).
[27]
Zhang, C., Liu, Z., 1997. Modern Deposition and Simulation Experiment in River and Lake. Geology Publishing House, Beijing, pp. 40-50 (in Chinese).
[28]
Zhang, C., Liu Z., Shi, D., 2000. Study of comparing sedimentology in high-sinuosity river and low-sinuosity river. Acta Sedimentologica Sinica , 18(2), 227-232 (in Chinese with English abstract).
[29]
Zhang, X., Liu, X., 2010. River Dynamics. China Water Power Press, Beijing, China, pp. 41-54, 139-143 (in Chinese).
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