<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Kunal,<div class=""><br class=""></div><div class="">As far as I can say, I would suggest option 3 (OBCS along the northern side, in your specific case).</div><div class="">Since you are using high spatial resolution, you could somehow mimic the shape of the riverbeds and simulate (as realistically as possible) both the thermohaline and momentum contribution of the main rivers.</div><div class="">We adopt this configuration in our forecasting system in a small area of the Mediterranean Sea (<a href="http://medeaf.inogs.it/adriatic" class="">http://medeaf.inogs.it/adriatic</a> - river discharges are still climatological, at the moment...): in the maps, the small "sticks" along the coastline are the final segments of the various riverbeds (19), close to the mouth.</div><div class="">You could try to implement something similar by imposing prescribed/measured values of V, T and S (if you use northern OBC, then U=0). Then, V times the area of your riverbed section is your discharge (in m^3/s).</div><div class="">If you also have data on the depth of the riverbed and very small dz in the first layers, you could also mimic the salt wedge and similar processes (see, for example, Figure 5 in <a href="https://www.mdpi.com/2077-1312/9/5/469" class="">https://www.mdpi.com/2077-1312/9/5/469</a>).</div><div class="">With this approach, river segments are part of the bathymetry: you simply have to apply the OBCS at the upstream end of each "channel". Of course, velocities can be very high (up to a few m/s...), so you must pay particular attention to time stepping and CFL condition.</div><div class=""><br class=""></div><div class="">Hope this helps...</div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">SQ</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 28 Jul 2021, at 12:09:56, kunal madkaiker <<a href="mailto:kunal.madkaiker02@gmail.com" class="">kunal.madkaiker02@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">Dear MITgcm users,</div><div class=""><br class=""></div><div class="">I am doing regional simulations in the Northern Indian Ocean. Stratification in Bay of Bengal is controlled by salinity and freshwater flux since many rivers like Ganges, Brahmaputra empty into this basin.</div><div class=""><br class=""></div><div class="">I am not able to properly simulate my temp, salinity and currents into the Head bay region of BoB as I am unable to produce an equatorward flow in my domain. Freshwater increases in this region during month of JJAS due to melting of Himalayan glaciers.</div><div class=""><br class=""></div><div class="">I have gone through previously asked similar questions about river runoff and came to know the following possibilities:<br class=""></div><div class=""><br class=""></div>1. To feed at surface through data.exf<br class=""><br class="">2. Feeding a 3-D run-off input using addMassFile<br class=""><br class=""><div class="">3. Through OBCS/ RBCS.</div><div class=""><br class=""></div><div class="">My domain is regional, with small dz and high spatial resolution.</div><div class="">Please let me know which option is the best suited and reliable, since I not only want to improve my temp/ salinity but also to rectify the circulation in head bay region. I would be using Dai et al. (2009) river runoff data.<br class=""></div><div class="">All suggestions are welcome. Attaching figure of my model domain.</div><div class=""><br class=""></div><div class="">Thanks and Regards,</div><div class="">Kunal<br class=""></div></div>
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