Adjustments in reach-scale bankfull geometry of a braided reach undergoing contrasting channel evolution processes

Arabian Journal of Geosciences - Tập 12 - Trang 1-13 - 2019
Xiaojuan Li1, Junqiang Xia1, Jie Li1, Meirong Zhou1
1State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China

Tóm tắt

A braided reach of the Lower Yellow River (LYR) underwent contrasting processes of channel aggradation (from 1986 to 1999) and channel degradation (from 1999 to 2012) due to altered water and sediment regimes. Therefore, remarkable adjustments in bankfull channel geometry occurred in the braided reach over the past 27 years. In this study, the reach-scale bankfull channel dimensions in the braided reach were calculated during the period 1986–2012 using a reach-averaged method, based on the surveyed post-flood profiles at 28 cross sections. Calculation results indicate that the reach-scale bankfull area decreased gradually from 3525 m2 in 1986 to 1482 m2 in 1999 during the channel aggradation stage and increased quickly to 4499 m2 in 2012 during the channel degradation stage, and the main-channel geometry in the braided reach generally tended to become narrower and deeper over the study period. It is also found that the variation in the reach-scale bankfull channel dimensions of the braided reach was closely related to the previous 5-year average discharges and incoming sediment coefficients during both flood and non-flood seasons, with the corresponding empirical functions being developed for these relations. The proposed relations can well reproduce the temporal changes in bankfull channel geometry of the braided reach undergoing contrasting channel evolution processes in response to the altered flow and sediment regime.

Tài liệu tham khảo

Abdel-Fattah MI (2015) Impact of depositional environment on petrophysical reservoir characteristics in Obaiyed Field, Western Desert, Egypt. Arab J Geosci 8:9301–9314 Ashraf M, Bhatti MT, Shakir AS (2016) River bank erosion and channel evolution in sand-bed braided reach of River Chenab: role of floods during different flow regimes. Arab J Geosci 9:140 Chen JG, Hu CH, Dong ZD, Liu DB (2006) Change of bankfull and bed-forming discharges in the Lower Yellow River. J Sediment Res 5:10–16 (in Chinese) Chien N, Zhang R, Zhou ZD (1987) Fluvial processes. Science, Beijing (in Chinese) De Rose RC, Stewardson MJ, Harman C (2008) Downstream hydraulic geometry of rivers in Victoria, Australia. Geomorphology 99:302–316 Gregory KJ, Park C (1974) Adjustment of river channel capacity downstream from a reservoir. Water Resour Res 10:870–873 Harman C, Stewardson M, Derose R (2008) Variability and uncertainty in reach bankfull hydraulic geometry. J Hydrol 351:13–25 Haucke J, Clancy KA (2011) Stationarity of streamflow records and their influence on bankfull regional curves. J Am Water Resour Assoc 47:1338–1347 He L, Wilkerson GV (2011) Improved bankfull channel geometry prediction using two-year return-period discharge. J Am Water Resour Assoc 47:1298–1316 Jowett IG (1998) Hydraulic geometry of New Zealand rivers and its use as a preliminary method of habitat assessment. Regul Rivers Res Manag 14:451–466 Knighton D (1996) Fluvial forms and processes. Wiley, New York Kuriqi A, Ardiçlioǧlu M (2018) Investigation of hydraulic regime at middle part of the Loire River in context of floods and low flow events. Pollack Periodica 13(1):145–156 Kuriqi A, Fernandes MR, Santos A and Ferreira MT (2017) Historical maps potential on the assessment of the hydromorphological changes in large rivers: towards sustainable rivers management under altered flows. In Geophysical Research Abstracts of EGU General Assembly, Vol 19: EGU2017-4183. Lee JS, Julien PY (2006) Downstream hydraulic geometry of alluvial channels. J Hydraul Eng 132(12):1347–1352 Leopold LB, Maddock T (1953) The hydraulic geometry of stream channels and some physiographic implications. Professional Paper No. 252. U.S. Geological Survey, Washington, DC (57 pp.) Li WW, Fu XD, Wu BS, Wu WQ (2013) Influences of non-flood-season flow and sediment load on bankfull discharge in lower Yellow River. J Hydroelectric Eng 32(1):132–138 (in Chinese) Li J, Xia JQ, Zhou MR, Deng SS, Wang ZH (2018) Channel geometry adjustments in response to hyperconcentrated floods in a braided reach of the Lower Yellow River. Prog Phys Geogr 42(3):352–368 Liang ZY, Yang LF, Feng PL (2005) Relations of channel geometry to water and sediment rate for the lower Yellow River. J Hydroelectric Eng 24(6):67–71 (in Chinese) Little WC, Thorne CR, Murphey JB (1982) Mass bank failure analysis of selected Yazoo basin streams. Trans ASAE 25:1321–1328 Liu F, Chen SL, Dong P, Peng J (2012) Spatial and temporal variability of water discharge in the Yellow River Basin over the past 60 years. J Geogr Sci 22(6):1013–1033 Miao CY, Ni JR, Borthwick A (2010) Recent changes of water discharge and sediment load in the Yellow River basin, China. Prog Phys Geogr 34(4):541–561 Navratil O, Albert MB (2010) Non-linearity of reach hydraulic geometry relations. J Hydrol 388:280–290 Page K, Read A, Frazier P, Mount N (2005) The effect of altered flow regime on the frequency and duration of bankfull discharge: Murrumbidgee River, Australia. River Res Appl 21:567–578 Peng J, Chen SL, Dong P (2010) Temporal variation of sediment load in the Yellow River basin, China, and its impacts on the lower reaches and the river delta. Catena 83:135–147 Petts GE, Gurnell AM (2005) Dams and geomorphology: research progress and future directions. Geomorphology 71:27–47 Pinter N, Heine RA (2005) Hydrodynamic and morphodynamic response to river engineering documented by fixed-discharge analysis, Lower Missouri River, USA. J Hydrol 302:70–91 Ran LS, Lu XX, Xin ZB, Yang XK (2013) Cumulative sediment trapping by reservoirs in large river basins: a case study of the Yellow River basin. Glob Planet Chang 100:308–319 Shin YH, Julien PY (2010) Changes in hydraulic geometry of the Hwang River below the Hapcheon Re-regulation Dam, South Korea. Int J River Basin Manag 8:139–150 Stewardson M (2005) Hydraulic geometry of stream reaches. J Hydrol 306(1–4):97–111 Surian N, Rinaldi M (2003) Morphological response to river engineering and management in alluvial channels in Italy. Geomorphology 50:307–326 Tian S, Wang W, Xie B, Zhang M (2016) Fluvial processes of the downstream reaches of the reservoirs in the Lower Yellow River. J Geogr Sci 26:1321–1336 Wang HJ, Yang ZS, Saito Y, Liu JP, Sun XX (2006) Interannual and seasonal variation of the Huanghe (Yellow River) water discharge over the past 50 years: connections to impacts from ENSO events and dams. Glob Planet Chang 50(3–4):212–225 Wang SA, Fu BJ, Piao SL et al (2015) Reduced sediment transport in the Yellow River due to anthropogenic changes. Nat Geosci 9(1):38–41 Wohl EE, Wilcox A (2005) Channel geometry of mountain streams in New Zealand. J Hydrol 300:252–266 Wolman MG, Leopold LB (1957) River flood plains: some observations on their formation. U.S. Geological Survey Professional Paper 282-C, Washington, DC Wu BS, Xia JQ, Fu XD, Zhang YF, Wang GQ (2008a) Effect of altered flow regime on bankfull area of the lower Yellow River, China. Earth Surf Process Landf 33:1585–1601 Wu BS, Wang GQ, Xia JQ, Fu XD, Zhang YF (2008b) Response of bankfull discharge to discharge and sediment load in the lower Yellow River. Geomorphology 100:366–376 Xia JQ, Wu BS, Wang YP, Zhao SG (2008) An analysis of soil composition and mechanical properties of riverbanks in a braided reach of the lower Yellow River. Chin Sci Bull 53:2400–2409 Xia JQ, Li XJ, Li T, Zhang XL, Zong QL (2014a) Response of reach-scale bankfull channel geometry to the altered flow and sediment regime in the lower Yellow River. Geomorphology 213:255–265 Xia JQ, Li XJ, Zhang XL, Li T (2014b) Recent variation in reach-scale bankfull discharge in the Lower Yellow River. Earth Surf Process Landf 39:723–734 Xia JQ, Li J, Carling PA, Zhou MR, Zhang XL (2017) Dynamic adjustments in bankfull width of a braided reach. P I Civil Eng-Wat M 172:207–216. https://doi.org/10.1680/jwama.17.00043 Xu JX (2003) A study of sediment delivery by floods in the lower Yellow River. Hydrolog Sci J 48(4):553–566 Yao WY, Xu JX (2013) Impact of human activity and climate change on suspended sediment load: the upper Yellow River, China. Environ Earth Sci 70(3):1389-1403