The history of palaeoflood and palaeoclimate recorded in the flood deposits of the Kherlen River, Mongolia

摘要: Abstract This study examines the 1500-year history of massive floods as recorded in slackwater deposits Kherlen River basin Mongolia. The area is located along Baganuur district, Ulaanbaatar. Site HL1 has a flood frequency 89 years and an accumulation rate 1.2 mm/y over approximately 1500 years. HL2 72.2 1.46 mm/y during about 700 range calculated value for annual period 10th century to early 20th at site entirely different from that other periods. It considered palaeohydrological environment time might have been influenced by climatic change well geomorphological hydrological change. Based on results identification discrete flooding age dating ( 137 Cs 14 C), sedimentary layers were divided into 4 periods (period 1: 1960–2012, 2: 970–1960, 3: 533–970, 4: 427–533) 2 1290–1960), respectively. authors suggest past climate region was greatly East Asia summer monsoon. suggested occurrence large-scale eastern Mongolia strengthening weakening monsoon due