Engineering Linking physics interest with civil engineer [2 out of 1]

[tesla_]

Dear friends,
I am completing my bachelors in engineering in civil engineering this year. I always had a inclination towards physics from childhood but followed the most usual path of engineering due to family.
Now, my plan is to go into a field which is similar to physics or requires intensive physics and do my PhD later in it. I have been able to find out transportation engineering and hydraulics as two fields which are under civil engineering but requiring physics input.
Now, please tell me which should i go for ? And please attach why you think so.

Thanks people!

 

[tesla_]

PLease reply.