Beach morphologies, primarily include shape, surface changes/variation, and beach volume along with slope, are very dynamic and believed to be largely controlled by waves and currents (Komar, 1998). Contrary to this general notion, results presented in this paper suggest a strong control of the local morpho-tectonic frame-work on foreshore sedimentation. In the 20 km long study area between Bhatkal on the north and Uppunda in the south, foreshore morphology range from reflective and dissipative to intermediate types, but nearshore hydrodynamic regime is similar. The inland morpho-tectonic frame-work reveals graben and horst-like structures. The foreshores bordering these grabens and horsts are dissipative and reflective respectively, have distinctly different granulometric dynamics and sedimentation processes, whereas an intermediate type between the dissipative and the reflective show a large seasonal variability in terms of beach width and slope. The foreshore profile modification indicated that the reflective beaches remained reflective and the dissipative beaches remained dissipative throughout the year, despite the large variation in the wave energy condition from monsoon through post-monsoon to pre-monsoon. Spit growth is observed only in the dissipative beach. Granulometric dynamics in all the three types of beaches show distinct differences. The reflective beaches show significant fluvial characteristics of sediments in all the seasons, dissipative beaches show minor fluvial characteristics and the intermediate beaches show significant fluvial characteristics only during the monsoon seasons. Sediment transport process in the reflective beaches is dominantly by rolling process, in the dissipative beaches suspension is the dominant mechanism, and in the intermediate type beaches a large range from suspension to rolling is observed. Sediments in the beaches are negatively skewed through symmetrical to positively skewed in reflective beaches, while in dissipative beach negative skewness is dominant. Integration of the tectonic framework, beach morphology and granulometric dynamics suggest that temporal and spatial variations in textural characteristics are related to a strong morpho-tectonic control rather than seasonal variations in wave energy condition.

海滩的形态主要包括形状，表面变化/变化以及海滩的体积和坡度，都是非常动态的，并且被认为主要受波浪和洋流控制（Komar，1998）。与这一一般概念相反，本文提出的结果表明，对滨海沉积的局部形态构造框架有很强的控制力。在北部的Bhatkal和南部的Uppunda之间的20 km长的研究区域中，前岸的形态范围从反射型和耗散型到中间型，但近岸流体动力状态相似。内陆形态构造框架揭示了grab陷和类似霍斯特的结构。与这些grab陷和霍斯特接壤的前滨分别具有耗散性和反射性，它们的粒度动力学和沉积过程截然不同，而耗散性和反射性之间的中间类型在海滩宽度和坡度方面表现出较大的季节性变化。尽管从季风到季风后到季风前的波能状况变化很大，但前滨剖面的变化表明，全年反射性海滩仍保持反射性，耗散性海滩仍保持耗散性。仅在耗散的海滩上观察到唾液的生长。所有这三种类型的海滩的粒度动力学都显示出明显的差异。在所有季节中，反射性海滩均表现出明显的河流沉积特征，耗散性海滩仅表现出较小的河流特征，而中间海滩仅在季风季节中表现出明显的河流特征。反射泳滩的泥沙输运过程主要是滚动过程，在耗散泳滩中的悬浮是主要机制，而在中型泳滩中，从悬浮到滚动的范围很大。在反射性海滩中，沉积物中的泥沙呈负对称偏斜，而在正反射中呈正偏斜；而在耗散性海滩中，负偏斜占主导地位。构造框架，海滩形态和粒度动力学的综合表明，纹理特征的时空变化与强烈的地貌构造控制有关，而不是与波能状况的季节性变化有关。在中型沙滩上，观察到从悬浮到滚动的大范围变化。在反射性海滩中，沉积物中的泥沙呈负对称偏斜，而在正反射中呈正偏斜；而在耗散性海滩中，负偏斜占主导地位。构造框架，海滩形态和粒度动力学的综合表明，纹理特征的时空变化与强烈的地貌构造控制有关，而不是与波能状况的季节性变化有关。在中型沙滩上，观察到从悬浮到滚动的大范围变化。在反射性海滩中，沉积物中的泥沙呈负对称偏斜，而在正反射中呈正偏斜；而在耗散性海滩中，负偏斜占主导地位。构造框架，海滩形态和粒度动力学的综合表明，纹理特征的时空变化与强烈的地貌构造控制有关，而不是与波能状况的季节性变化有关。