Pier Foundations are preferred in coastal areas and Stepped foundations are commonly used in areas with sloping ground.

Jacqueline Wade
Environmental engineer
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Pier Foundations are preferred in coastal areas and Stepped foundations are commonly used in areas with sloping ground.
For sloping ground
For coastal areas
To know more about foundations for different ground conditions,
https://theconstructor.org/geotechnical/construction-foundation-different-ground-conditions/7606/10
General Discussion :
As per my knowledge regarding Geotechnical Engineering, following are the best type of foundation used in the coastal and sloped area.
Have a look.
The foundation on the sloping ground :
I) Stepped Foundation
II) Foundation at one Level
Foundation in a coastal area :
Question is not specific and does not provide enough information about requirements
Type of foundation in the coastal area depends upon the type of sand, bearing capacity of the soil, it may be rocky or brittle stones nearby area.
Also the type of building to be constructed it may be a single storey, 2 storey and multi-storey building. the need for the foundation is according to the type of sand and building to be constructed.
In general, the bearing capacity of the soil is not good enough, then the pear Foundation is to be adopted for multi-storey buildings.
In the sloped ground, stepped Foundation is adopted for giving is stability. In this case, pile Foundation is to be adopted in a deeper section of ground to provide a horizontal surface and also and sure about future stability. This type of foundation also resists earthquake vibrations and wind loads pressures.
Hi,
Raised Foundations(RF) Raised type of foundations is used in coastal areas because receives large amounts of rain to flooding. RF requires crucial planning because they are able to support the home and walls also provide protection from moisture. 2 types of RF:
1.Pier & Beam raised foundation
2. Stem wall raised foundation