ECMWF provides high-resolution analysis for model initialization. Is it fine to use only a single domain over a hilly terrain with 9km grid spacing for rainfall simulation during monsoon season? Will it impact the large-scale systems? Please suggest.
There is no exact rule to define the grid spacing on the horizontal, but since your study is on mountainous terrain, I recommend that you run the model with at least one nesting (two domains total). You could simulate with 12 and 4 km or with 9 and 3 km of resolution for the parent domain and the nested domain respectively.
Whether this resolution will affect large-scale systems will depend on the boundaries of the study area. Therefore, it is important that you identify the processes that interact with the study area and delimit correctly.
You should review articles about success stories with the WRF model in your study area or in areas with similar characteristics. In addition, it is always recommended to carry out a sensitivity study of the WRF model with different physical parameters so that you can identify the one that best suits your study area.
Finally, the available computing capacity is also important to consider when defining the resolution to implement with the WRF model.
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