How do I create smooth 3D surfaces from bathymetric soundings

I carry out annual depth soundings of a reservoir with point spacings up to about 30m maximum but usually within 15m and have been trying to create smooth 3D DTMs by converting the points to LiDAR values and then processing by binning. However, the results are very strange and lead to a pockmarked surface that is not representative of the dataset. TIN looks better but I would prefer a smooth surface. 
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