As you have learned from both rivers and coastal, there are 2 main factors that affect all of them: Erosion and deposition. You must take note that erosion is never completely without deposition happening and likewise deposition does not happen without erosion happening.
So in order to help you understand better, I have created this matrix for you all to see:
As you can see here on the outer bend of the meander, you can see that the water volume is bigger than that of the inner bank, so if you are standing on the inner bank, you will not get swept away, but you will at the out bank because of the higher speed. The reason for that is the higher volume of water has more kinetic energy, increasing the speed of the water.
Likewise with destructive waves, the gradient of the coast is steep, meaning there is a greater volume of water and where constructive waves are, the gradient is gentle and the water volume is low. If you follow the matrix above, you can see why the waves are constructive or destructive.
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