We are wrapping up the final two sites on this leg of my journey. Our work involves utilizing GNSS (Global Navigation Satellite System, a general term for GPS) instruments on buildings to measure subsidence below, as well as RSET-MH (Rod Surface Elevation Table-Marker Horizon) to measure compaction/subsidence above rods inserted deep into the ground. Additionally, we are collecting samples of sediment from the upper meters using an auger. Currently, we are traversing the interconnected waterways of the Sundarban Mangrove Forest by boat.
At Jorshing, Tanvir and Zohur are diligently probing for the sediment Marker Horizon in a rice field. Following our stop at Hiron Point, we spent the night at Kaga Dubaki within the Sundarbans Mangrove Forest. The next day, we continued our journey north, finally reaching Jorshing. While the RSET and auger teams set up, Zohur and I headed to a school/cyclone shelter where the GNSS receiver is located, encountering some technical difficulties with the SIM card and modem.
The process was a bit challenging due to locked SIM cards and outdated VPN settings, halting our progress until I could reach my contacts in the U.S. for assistance. The issues were eventually resolved as we were able to establish a connection, allowing for data retrieval. The RSET team also successfully completed their tasks during this time.
Moving forward, we proceeded to Polder 32, where subsidence issues have been a focus of our research efforts since 2012. The embanked islands in this area face similar challenges, with lower interior levels than the surrounding river, leading to waterlogging and subsidence. As we headed towards Polder 32, we observed a large number of fishermen utilizing the tides to catch fish along the Shibsa River.
Our journey continued with visits to various RSET sites within the Sundarbans and Sreenagar areas. Despite challenges like fog and muddy terrain, we successfully completed measurements and data collection tasks. We encountered wildlife, played music to deter tigers, and received hospitality from local families, all adding to our unique experiences in the field.
The work continues as we tackle technical issues, perform data downloads, and conduct field measurements, all while navigating the intricate ecosystem of the Sundarbans. Each day brings new challenges and discoveries, further enriching our understanding of this dynamic environment.
