Morphological evolution of river mouth spits: Wave effects and self-organization patterns

Qi, Yali; Yu, Qian; Gao, Shu; Liu, Zhiqiang; Fang, Xing; Guo, Yinlong

doi:10.1016/j.ecss.2021.107567

Cited by 4 publications

(9 citation statements)

References 51 publications

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“…Across a whole year, the net LST direction at Sigeng beach was southward except the northern section, as depicted in Figure 11B. The role of seasonal wave action in driving coastal beach changes was also confirmed by Zhou (2016) and Qi et al (2021). The former presented the seasonal changes of Sigeng beach by seasonal profile monitoring.…”

Section: Seasonal Wave Actionmentioning

confidence: 54%

“…Previous studies have showed that the direction of net LST in this local area was southward (Gao, 2014;Zhou, 2016;Lv, 2021;Qi et al, 2021). For Sigeng beach, the net LST direction in the middle and southern segment were southward, while that in the northern segment was northward due to the diffraction of NE waves by the long sand spit at the northernmost.…”

Section: Lst Patternmentioning

confidence: 71%

“…In wave-dominated estuaries, beach evolution is strongly influenced by the fluvial sediment discharge in addition to wave action (Anthony, 2015;Qi et al, 2021). Changhua River is the second largest river in Hainan Island, with a catchment area of 5070 km 2 and a length of 230 km (Wang et al, 2006).…”

Section: Reduction In Fluvial Sediment Loadmentioning

confidence: 99%

“…Changhua River is the second largest river in Hainan Island, with a catchment area of 5070 km 2 and a length of 230 km (Wang et al, 2006). The majority of fluvial sediment from Changhua River was transported southward by the longshore currents, which is the main sediment source of Sigeng beach (Zhou, 2016;Qi et al, 2021). Based on the historical hydrological data from 1957 to 2021 at Baoqiao station (the location indicated in Figure 1B), the annual average water discharge was basically constant.…”

Section: Reduction In Fluvial Sediment Loadmentioning

confidence: 99%

“…Based on the historical hydrological data from 1957 to 2021 at Baoqiao station (the location indicated in Figure 1B), the annual average water discharge was basically constant. However, the annual average fluvial sediment load had decreased from approximately 100 × 10 4 to 30 ×10 4 t/yr since the buildup of Daguang dam reservoir in 1993 (Figure 12; Qi et al, 2021). Additionally, the actual amount of sediment entering into the sea was much less, considering the frequent sand mining activities in the lower reaches and estuary of Changhua River in recent years.…”

Section: Reduction In Fluvial Sediment Loadmentioning

confidence: 99%

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Decadal evolution of a sandy beach adjacent to a river mouth under natural drivers and human impacts

Liu,

Cai,

et al. 2024

Front. Mar. Sci.

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As escalating environmental pressures threaten the world’s beaches, understanding the driving factors influencing their geomorphological changes is of critical global importance. This study focuses on the morphological changes of Sigeng beach adjacent to Changhua River Mouth in Hainan Island, China through decadal monitoring of shoreline and profile topography and tries to illuminate the natural and anthropogenic factors that drove geomorphological changes. The results showed that Sigeng beach undergone significant changes between 2008 and 2024, with notable accretion at the northernmost and southernmost and general erosion at other sections. The shoreline change rates ranged between -18.4 m/yr and 13.0 m/yr, with the average rate of -1.9 m/yr, indicating overall erosion. The net longshore sediment transport (LST) rates along Sigeng beach was estimated through the combination of the cross-shore (profile) and longshore (shoreline) changes. The overall direction of net LST along the beach were southward, except for the northern section where the direction was northward due to the diffraction of NE waves by the long sand spit at the northernmost. The net LST rates at each profile varied from 0.8×104 m3/yr to 3.5×104 m3/yr. The main factors controlling Sigeng beach evolution, including seasonal wave action and reduction in fluvial sediment load, followed by sand spit and coastal structures, typhoon events, aeolian transport, and sea level rise, were discussed. Subsequently, adaptive protection measures, including beach nourishment, accompanied with groin system or multiple detached breakwaters were proposed to combat with beach erosion. The analysis presented in this study is helpful to understand the morphodynamics and to predict the future change of beaches.

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Section: Seasonal Wave Actionmentioning

confidence: 54%

Section: Lst Patternmentioning

confidence: 71%