DOI: 10.5194/hess-21-4563-2017
Scopus记录号: 2-s2.0-85029468629
论文题名: Spatiotemporal variation of Van der Burgh's coefficient in a salt plug estuary
作者: Shaha D ; C ; , Cho Y ; -K ; , Kim B ; G ; , Rafi Afruz Sony M ; , Kundu S ; R ; , Faruqul Islam M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 9 起始页码: 4563
结束页码: 4572
语种: 英语
Scopus关键词: Climate change
; Drought
; Estuaries
; Mercury (metal)
; Rivers
; Tides
; Discharge driven
; Estuarine circulation
; High resolution
; Hydrographic properties
; Relative contribution
; River discharge
; Spatio-temporal variation
; Time independents
; Salt water intrusion
; bottom water
; climate change
; dry season
; estuarine environment
; hydrodynamics
; river discharge
; saline intrusion
; spatiotemporal analysis
英文摘要: Salt water intrusion in estuaries is expected to become a serious global issue due to climate change. Van der Burgh's coefficient, K, is a good proxy for describing the relative contribution of tide-driven and gravitational (dischargedriven and density-driven) components of salt transport in estuaries. However, debate continues over the use of the K value for an estuary where K should be a constant, spatially varying, or time-independent factor for different river discharge conditions. In this study, we determined K during spring and neap tides in the dry (< 30m-3- s-1-/ and wet (> 750m-3- s-1-/ seasons in a salt plug estuary with an exponentially varying width and depth, to examine the relative contributions of tidal versus density-driven salt transport mechanisms. High-resolution salinity data were used to determine K. Discharge-driven gravitational circulation (K ∼0.8) was entirely dominant over tidal dispersion during spring and neap tides in the wet season, to the extent that salt transport upstream was effectively reduced, resulting in the estuary remaining in a relatively fresh state. In contrast, K increased gradually seaward (K ∼0.74) and landward (K ∼0.74) from the salt plug area (K ∼0.65) during the dry season, similar to an inverse and positive estuary, respectively. As a result, density-driven inverse gravitational circulation between the salt plug and the sea facilitates inverse estuarine circulation. On the other hand, positive estuarine circulation between the salt plug and the river arose due to density-driven positive gravitational circulation during the dry season, causing the upstream intrusion of high-salinity bottom water. Our results explicitly show that K varies spatially and depends on the river discharge. This result provides a better understanding of the distribution of hydrographic properties. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79061
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Fisheries Management, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh; School of Earth and Environmental Science/Research Institute of Oceanography, Seoul National University, Seoul, South Korea; Deparment of Oceanography, Chonnam National University, Gwangju, South Korea; Hydrography Division, Mongla Port Authority, Bagherhat, Bangladesh
Recommended Citation:
Shaha D,C,, Cho Y,et al. Spatiotemporal variation of Van der Burgh's coefficient in a salt plug estuary[J]. Hydrology and Earth System Sciences,2017-01-01,21(9)