Based on the data of high resolution seismic profiles, an ancient river channel system of the last glaciation occurred along the Zhedong and Xihu depression in the southeast of Hupijiao rise. The distribution of the channel fill system shows that the ancient Changjiang River went through the Changjiang depression into the low land plain of the outside continental shelf during the low sea level cycle of the last glaciation. The big channel fill into Okinawa trough is not found due to the depletion of the river kinetic energy in the low land plain. The river discharge dispersal was of an important role to the dilution of the northern Okinawa trough sea at that time. Six ancient river channel systems (A-F), which are main distributaries of ancient Changjiang in the East China Sea continental shelf during the last glaciation, may be buried off the modern Changjiang estuary. The distribution of these channels coincides with the zonal elevations in the sea floor.

Based on the measuring data of landforms, bigh-resolution seismic profiles, drilling cores, etc. a diapir body was found in the north of the modem Yellow River delta The diapir body with alength of 5 km and awidth of 1 km is distributed on the middle to low part of the slope of an abandoned delta lobe. Its formation is related to the deformity of the soft stratum which is deposited in the prodelta and covered by the stratum of the mouth bar sediments Research results show that its formation is very different from the Mississippi River delta's diapirs but related to the erosion of the seabed and occurs on the location with a large eroded quantity The soft stratum and its diapir body can result in a great hazard to marine buildings.

现场观测资料和卫星遥感校准图像计算表明，1855年以来，黄河三角洲新淤陆地3699km2，生长速率为26。8 km2/a，黄河输入三角洲1×108t泥沙形成3.144km2的陆地。进入河口区的泥沙约88.4%堆积在水下8km宽的三角洲前缘。研究表明，这一堆积比例是河口切变锋、异重流和潮流场相互作用的结果，异重流在黄河汛期一直存在，大约搬运黄河来沙的60%沉积在三角洲前缘；一个潮周期内，切变锋出现两次，它能够捕获异轻羽状流中的悬浮泥沙堆积，也能够限制异重流的远距离扩散。切变锋消失后，少量悬浮泥沙才能远距离扩散，随潮流离开三角洲水下斜坡。