A sea level rise can be either a global sea level rise or a regional sea level rise. A global sea level rise is attributed to the thermal expansion of the upper ocean layers and melting of polar ice sheets and mountain glaciers and even to the movement of celestial bodies and sunspot activity. A regional relative sea level rise is caused not only by a global rise but also by a regional groundwater level change resulting from a monsoon, ocean current, delta accretion or engineering project, or local land subsidence, which consists of the vertical movement of the Earth’s crust caused by tectogenesis and rheomorphism, sediment compaction, overexploitation of groundwater, or overloading by large buildings