Abstract: Sediment samples were collected from two sites in the artificial channel salt marsh of the Duliujian River, through continuous sampling along the side wall of artificial dig pits. The chronology was developed using ²¹⁰Pb and ¹³⁷Cs dating methods, and grain size, foraminifera and hydrologic data were used to study the deposition of modern flooding events. The results show that ²¹⁰Pb_exc activities are obviously lower in 3~6 cm and 10~14 cm layers, corresponding to the main peak and minor peak of ¹³⁷Cs. In addition, comparing with the adjacent layers, these two layers show coarse-grained, poorly sorted, low foraminiferal abundance and high foraminiferal brokenness percentage. The results of ²¹⁰Pb dating show that the main peaks of ¹³⁷Cs was 1963, corresponding to the global ¹³⁷Cs fallout well; however, the minor peaks was not 1986, so it was not caused by the accident of the Chernobyl Reactor. The hydrological data show that there were two flood events in 1963 and 1996 in this area. Therefore, it can be concluded that these two special layers of S4 and S5 sites were caused by the flood events. It is indicated that multi indexes can help to reconstruct flood deposition, which also can help to find disasters and climate events in geological periods, and to provide scientific data for disaster prevention and future plan.

Key words: flood deposit, ²¹⁰Pb, ¹³⁷Cs, grain size, foraminifera, Bohai Bay