Salinity Response to Seasonal Runoff in a Complex Estuarine System (Cochin Estuary, West Coast of India)
Salinity Response to Seasonal Runoff in a Complex Estuarine System (Cochin Estuary, West Coast of India)
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DOI：
10.2112/jcoastres-d-13-00038.1
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发表时间：
2015-07
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影响因子：
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通讯作者：
Vinita Janardanan;Shivaprasad Amaravayal;C. Revichandran;N. Manoj;K. Muraleedharan;B. Jacob
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文献类型：
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作者：
Vinita Janardanan;Shivaprasad Amaravayal;C. Revichandran;N. Manoj;K. Muraleedharan;B. Jacob
维尼塔; Shivaprasad，A.; Revichandran，C.; Manoj，N.T.; Muraleedharan，K.R.，和Binzy，J.，2015.复杂河口系统（印度西海岸科钦河口）中盐度对季节径流的响应。本文利用近一年的盐度剖面纵向观测资料，对科钦河口的水文条件进行了研究。河口从雨季的盐楔状态转变为旱季的部分或充分混合状态。在高径流月份（6月至9月）和中等径流月份（12月至12月和5月），盐度结构是一个强大的功能，在河流径流的变化，河口连贯地响应淡水的情节输入。但在1 - 4月期间，盐分场对径流的依赖性因轴向扩散系数而减弱。盐的输移是河流径流引起的向海通量和潮汐引起的向陆扩散通量之间的平衡。除上游端外，几乎所有沿着河口段都是后者占主导地位，增加了河口的含盐量。计算出的水平扩散系数范围为5 ~ 704 m2 s-1。科钦河口在丰水期的冲刷时间为1 ~ 2.5d。在旱季，潮汐驱动的冲洗时间为8.7天。结果代表了一个重要的基准，对数值模型进行测量，将有助于更好地了解河口内的生物和化学分布。
ABSTRACT Vinita, J.; Shivaprasad, A.; Revichandran, C.; Manoj, N.T.; Muraleedharan, K.R., and Binzy, J., 2015. Salinity response to seasonal runoff in a complex estuarine system (Cochin estuary, west coast of India). The hydrographic conditions in Cochin estuary are investigated using longitudinal measurements of salinity profiles during a 1-year period. The estuary transformed from salt wedge conditions during the wet season to a partially or well-mixed state during the dry season. During high runoff months (June–September) and moderate runoff months (October–December and May), the salinity structure is a strong function of variations in river runoff, and the estuary responds coherently to episodic inputs of freshwater. However, during the period from January to April, the dependence of the salinity field on runoff was weakened by axial diffusivity. The salt transport was a balance between seaward flux induced by river runoff and tidally induced diffusive landward flux. The latter dominated in almost all sections along the estuary except at the upstream end, increasing the salt content of the estuary. The computed horizontal diffusion coefficients ranged from 5 to 704 m2 s−1. The flushing time of Cochin estuary ranged from 1 to 2.5 days during the wet season. During the dry season, the tide-driven flushing time was 8.7 days. The results represent an important benchmark against which numerical models should be measured and will be useful for developing a better understanding of biological and chemical distributions within the estuary.