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===Sediments to the Sea=== Collectively, the modern Ayeyarwady (Irrawaddy) and Thanlwin (Salween) rivers deliver >600 Mt/yr of sediment to the sea.<ref name="sciencedirect2020">{{cite journal |title=Liu, J.P., Kuehl, S.A., Pierce, A.C., Williams, J., Blair, N.E., Harris, C., Aung, D.W., Aye, Y.Y., 2020. Fate of Ayeyarwady and Thanlwin Rivers Sediments in the Andaman Sea and Bay of Bengal. Marine Geology, 106137. |journal=Marine Geology |year=2020|volume=423 |page=106137 |doi=10.1016/j.margeo.2020.106137|doi-access=free|last1=Liu |first1=J. Paul |last2=Kuehl |first2=Steven A. |last3=Pierce |first3=Austin C. |last4=Williams |first4=Joshua |last5=Blair |first5=Neal E. |last6=Harris |first6=Courtney |last7=Aung |first7=Day Wa |last8=Aye |first8=Yin Yin }}</ref> Most recent studies show: 1) There is little modern sediment accumulating on the shelf immediately off the Ayeyarwady River mouths. In contrast, a major mud wedge with a distal depocenter, up to {{convert|60|m}} in thickness, has been deposited seaward in the Gulf of Martaban, extending to approximately {{convert|130|m}} water depth into the Martaban Depression. Further, 2) There is no evidence showing that modern sediment has accumulated or is transported into the Martaban Canyon; 3) a mud drape/blanket is wrapping around the narrow western Myanmar Shelf in the eastern Bay of Bengal. The thickness of the mud deposit is up to {{convert|20|m}} nearshore and gradually thins to the slope at {{convert|β300|m}} water depth, and likely escapes into the deep Andaman Trench; 4) The estimated total amount of Holocene sediments deposited offshore is approximately {{convert|1290 Γ 109|t}}. If we assume this has mainly accumulated since the middle Holocene highstand (~6000 yr BP) like other major deltas, the historical annual mean depositional flux on the shelf would be {{convert|215|Mt}} per year, which is equivalent to ~35% of the modern Ayeyarwady-Thanlwin rivers derived sediments; 5) Unlike other large river systems in Asia, such as the Yangtze and Mekong, this study indicates a bi-directional transport and depositional pattern controlled by the local currents that are influenced by tides, and seasonally varying monsoons winds and waves.<ref name="sciencedirect2020" />
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