Abstarct: Tidal Inlets have formed by the sea water developments such as tidal, wave and even rivers with the influence towards the coast that create some new coastal areas. These areas due to protected conditions compared with the sea and open waters are suitable areas for development of port business districts, tourist and etc.; hence, the Tidal Inlets can be regarded as strategically important areas. In the last century due to increased greenhouse gases in the Earth's temperature rises, polar ice began to melt which can cause consequences. In this research has been paid as a case study to examine the Khowr E Musa situation in the far North West of the Persian Gulf. At first specified structural and morphological state of this estuary and then hydrodynamic condition and stability of the spans of Khowr E Musa has been known. The following, with the help of numerical methods software (Mike 21), hydrodynamic and morphological changes of Khowr E Musa have been investigated affected of three scenarios in case of No RSLR, RSLR 20cm and RSLR 70cm. With conducted analysis the morphologic components of the Khowr E Musa have been identified and in terms of hydrodynamic was proven that Khowr E Musa is a subset of estuaries which has dominated tidal flow, low wave energy and tidal range is moderate to high. Also in terms of hydrodynamic stability of Khowr E Musa in two methods (Bruun and CEA Software) was observed a quite stable Tidal Inlet. In the discussion to numerical study with Mike 21, was determined flow pattern and sedimentation and determined that the sea level rise was not created a significant change in the region tidal level pattern; but the flow rate increases with increasing water level.