刘辉泗(1913～1943)

刘辉泗,江西南昌人,1932年毕业于江西省立第二中学,同年考入清华大学地质系,1936年获理学学士学位,旋即回到江西,任江西省地质调查所技士、技正,曾一度兼任乐平锰矿采炼厂厂长,江西省金矿勘探队工程师以及乐安江采金厂厂长等职。 刘辉泗是江西省1∶20万区域地质矿产调查工作的开创者之一,江西省最早完成并出版     

Dedication: Dr. Scott W. Nixon (1943–2012)

The availability of suspended sediments will be a dominant factor influencing the stability of tidal wetlands as sea levels rise. Watershed-derived sediments are a critical source of material supporting accretion in many tidal wetlands, and recent declines in wetland extent in several large river delta systems have been attributed in part to declines in sediment delivery. Little attention has been given, however, to changes in sediment supply outside of large river deltas. In this study, significant declines in suspended sediment concentrations (SSCs) over time were observed for 25 of 61 rivers examined that drain to the East and Gulf Coasts of the USA. Declines in fluvial SSC were significantly correlated with increasing water retention behind dams, indicating that human activities play a role in declining sediment delivery. There was a regional pattern to changes in fluvial sediment, and declines in SSCs were also significantly related to rates of relative sea level rise (RSLR) along the coast, such that wetlands experiencing greater RSLR also tend to be receiving less fluvial sediment. Tidal wetlands in the Mid-Atlantic, Mississippi River Delta, and Texas Gulf especially may become increasingly vulnerable due to rapid RSLR and reductions in sediment. These results also indicate that past rates of marsh accretion may not be indicative of potential future accretion due to changes in sediment availability. Declining watershed sediment delivery to the coastal zone will limit the ability of tidal marshes to keep pace with rising sea levels in some coastal systems.     

Farewell to Harry M. Parker (1946–2019)

Mathematical Geosciences -     

Strontium-90 in Seawater and Bottom Sediments of the Barents Sea Shelf (2000–2019)

Doklady Earth Sciences - The long-term dynamics of the 90Sr concentration in water and bottom sediments of the Barents Sea is analyzed. The dependence of the distribution of 90Sr on the conditions...