The present study reports on the vertical structure of the current profile of the Jharkhali of Sundarban ecosystem. The clay embankments constructed along the Sundarbans for coastal protection are facing severe erosion problem due to tidal current, extreme water levels, storm surges, overtopping and breaches in embankments which lead to widespread flooding. The understanding of the current profile of Sundarban aquatic system with respect to depth of water column is essential for suitable engineering design for embankment. It will be used for conservation of coastal resources and inhabitants of the Sundarbans from the natural disasters. The tidal range during the present study was 6.1 m and 5 tidal constituents viz. M₂, S₂, K₁, O₁, and N₂ are predominant at Jharkhali. The minimum (114.55 cm/s) and maximum (134.45 cm/s) current speed were observed at bottom and mid depth respectively. The maximum speed at bottom is also due to longitudinal salinity gradients, which may induce larger velocities in the lower part of the water column. The vertical velocity profiles during flood are characterized by a near bed maximum. The maximum speed usually occurs during mid-flood and mid-ebb periods and also varying with moon phase, usually maximum and minimum speed were observed during spring tide and neap tide respectively. This trend is persisting in the entire water column from the surface to bottom. The direction of the current is controlled by orientation of the river channel and adjacent tributaries. In general, water travels towards North and WNW direction during flood tide and E & ESE direction during ebb tide. Interestingly, about 80-degree difference in current direction was noticed between surface and bottom current with clockwise spiral movement.

本研究报告了Sundarban生态系统Jharkhali当前剖面的垂直结构。由于潮流，极端水位，风暴潮，山顶和堤坝的破坏而导致泛滥，沿桑达尔班河沿岸建造的用于沿海保护的粘土堤坝面临严重的侵蚀问题。了解Sundarban水生系统相对于水柱深度的当前状况对于路堤的合适工程设计至关重要。它将用于保护沿海资源和桑达尔邦人免受自然灾害的侵害。在本研究中，潮汐范围为6.1 m，潮汐成分为5。M ₂，S ₂，K ₁，O ₁和N ₂在贾哈利邦占主导地位。在底部和中间深度分别观察到最小（114.55 cm / s）和最大（134.45 cm / s）电流速度。底部的最大速度也归因于纵向盐度梯度，这可能会在水柱下部产生较大的速度。洪水期间的垂直速度剖面的特征是接近床层最大值。最大速度通常发生在洪水中期和退潮期间，并且也随着月相变化，通常分别在春季潮和潮汐潮时观测到最大和最小速度。这种趋势在从表层到底部的整个水柱中都持续存在。水流的方向由河道和相邻支流的方向控制。通常，在洪水潮和E＆E期间，水流向北和西西北方向 退潮期间的ESE方向。有趣的是，随着顺时针螺旋运动，在表面和底部电流之间在电流方向上发现了大约80度的差异。