This study in the coastal waters off Kochi along the southwest coast of India during the Southwest Monsoon (SWM) presents the biophysical implications of freshwater influx over a small spatial scale. Field sampling was carried out along two cross-shore transects (ST and NT), oriented ~ 8 km apart, and located to the south (ST) and north (NT) of the Kochi inlet, up to the depth of 50 m. The vertical profiles of temperature and dissolved oxygen showed clear upwelling signatures along both ST and NT, but more prominently along the latter transect. The freshwater influx and its southward advection due to the prevailing coastal currents caused stronger salinity stratification along ST and inhibited the rising of upwelled waters in the nearshore waters. The integrated phytoplankton biomass (chlorophyll a) in the upper 10 m was markedly higher along NT (50 mg m⁻³) compared to ST (35 mg m⁻³). The size-based phytoplankton biomass showed an increase in larger size (micro) fraction of phytoplankton along NT especially in the nearshore waters, wherein upwelling was prominent up to the surface waters. The more efficient surfacing of oxygen-deficient waters along NT cause more likely chances to concentrate small pelagic fishes there as compared to ST. Thus, this study presents a case, wherein, the freshwater influx and associated inhibition of coastal upwelling in the nearshore waters vary within a short spatial scale depending upon the advection of freshwater plume by the coastal currents. Also, showed that this situation might be valid to many estuarine inlet regions along the southwest coast of India during the SWM.

这项在西南季风（SWM）期间在印度西南沿海高知沿海的沿海水域进行的研究提出了在小空间范围内淡水涌入的生物物理影响。沿两个相距约8 km的跨岸横断面（ST和NT）进行野外采样，这些横断面位于高知入口的南部（ST）和北部（NT），深度为50 m。温度和溶解氧的垂直剖面沿ST和NT均显示出清晰的上升流特征，但沿后者的横断面更为明显。由于盛行的沿海水流引起的淡水涌入及其向南平流，导致沿ST的盐分分层更强，并抑制了近岸水域上升水的上升。综合浮游植物生物量（叶绿素a）在上部10 m沿NT（50 mg m ^-3）明显高于ST（35 mg m ^-3）。基于大小的浮游植物生物量显示出沿NT的浮游植物的较大尺寸（微）级数增加，特别是在近岸水域，其中上升流在表层水域很明显。与ST相比，沿NT缺氧水的更有效地堆肥导致更有可能在此集中小型中上层鱼类。因此，本研究提出了一个案例，其中，淡水涌入和对近岸水域海岸上升的抑制作用在短的空间范围内变化，这取决于沿海水流对淡水羽流的平流作用。而且，表明这种情况可能对SWM期间印度西南海岸许多河口入口地区有效。