Saline intrusion in the Nandu River Estuary, Hainan Island

ZHAO Junpeng; GONG Wenping; WANG Daoru

doi:10.3969/j.issn.0253-4193.2013.05.002

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ZHAO Junpeng, GONG Wenping, WANG Daoru. Saline intrusion in the Nandu River Estuary, Hainan Island[J]. Haiyang Xuebao, 2013, 35(5): 14-28. doi: 10.3969/j.issn.0253-4193.2013.05.002

Citation:

ZHAO Junpeng, GONG Wenping, WANG Daoru. Saline intrusion in the Nandu River Estuary, Hainan Island[J]. Haiyang Xuebao, 2013, 35(5): 14-28. doi: 10.3969/j.issn.0253-4193.2013.05.002

ZHAO Junpeng, GONG Wenping, WANG Daoru. Saline intrusion in the Nandu River Estuary, Hainan Island[J]. Haiyang Xuebao, 2013, 35(5): 14-28. doi: 10.3969/j.issn.0253-4193.2013.05.002

Citation:

ZHAO Junpeng, GONG Wenping, WANG Daoru. Saline intrusion in the Nandu River Estuary, Hainan Island[J]. Haiyang Xuebao, 2013, 35(5): 14-28. doi: 10.3969/j.issn.0253-4193.2013.05.002

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Saline intrusion in the Nandu River Estuary, Hainan Island

doi: 10.3969/j.issn.0253-4193.2013.05.002

1.
Center for Coastal Ocean Science and Technology Research, Sun Yat-sen University, Guangzhou 510275, China
2.
Hainan Marine Development Plan and Design Research Institute, Haikou 570125, China

Received Date: 2011-09-03

Abstract

Abstract

Nandu River is the largest river in Hainan Island. The Nandu River Estuary is a short one, with a length of approximately 25 km and faces the Qiongzhou Strait in the north. The saline intrusion in the estuary demonstrates a trend of exacerbation in recent decades and requires a detailed study for its mechanism. In this study, the FVCOM model is utilized, which is calibrated by the observation data in February, 2009. Simulations for the dry and wet seasons are then conducted, respectively. The model results are used to study the temporal and spatial variations of flow, salinity and saline intrusion in the estuary during the two seasons. The mechanisms driving the landward salt flux at different positions of the estuary are investigated. The results indicate that the circulation is stronger during the neap tide in the dry season, while the situation becomes opposite in the wet season. The salinity stratification is weaker during the neap tide in both seasons. The saline intrusion distance is much longer in the dry season. The oscillatory tidal dispersion is the dominant agent driving the landward salt flux at the river mouth, while the steady shear becomes more important toward upstream. The deficit of salt in the main stream is balanced mainly by the salt input through the Haidianxi branch.
- Nandu River Estuary,
- saline intrusion,
- FVCOM model

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References(12)

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