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- Title
河口河道延伸对黄河下游河道淤积影响分析.
- Authors
师长兴
- Abstract
Using the data of channel cross section geometric surveys, daily mean water and sediment discharges, and water level at the location close to the river mouth, this study established the relations of cumulative erosion/deposition volume with water and sediment discharges and channel gradient for five reaches along the lower Yellow River. These relations were used to calculate siltation accretion in the five reaches arising from mouth channel extension for two scenarios in the period from 1976 to 1996. In the first scenario, the siltation accretion was the difference between the existing siltation in the river reaches and that in the case assuming the river mouth was fixed at its location in 1976 after the river was diverted to the present mouth channel.In the second scenario, it was the difference between the existing siltation in the river reaches and that in the case assuming the river remained in the Diaokouhe channel, the mouth channel in 1964-1976. The results show that siltation accretion mainly occurrs in the reaches downstream of Luokou and accounts for a high portion in the total siltation in these reaches, with a percentage of over 50% for cumulative siltation in 20 years in the first scenario. Nevertheless, the cumulative siltation accretion in 20 years only accounts for lower than 5% of the total siltation in the whole lower Yellow River. The minor role of siltation accretion owing to mouth channel extension in the heavy siltation in the river is attributed to the increase of the river load, tectonic subsidence of the river floodplain and progradation of the river deltas in long history. Since 2000, the river load has been decreased obviously and as a result, the river channel has been scoured continuously, but the degradation rate has been decreased in recent years. With sediment transport approaching to an equilibrium state, the effect of mouth channel extension on siltation in the river will increase relatively and slow but accumulative mouth channel extension may lead to aggradation of the lower Yellow River at a low rate.
- Publication
Yellow River, 2019, Vol 41, Issue 10, p21
- ISSN
1000-1379
- Publication type
Article
- DOI
10.3969/j.issn.1000-1379.2019.10.005