estuary region
2.The 2-D tidal current and sediment mathematical model for Feiyunjiang estuary is established.After verification,the model is applied to calculate the change of current and back silting in the port area of Fenghuangshan Port with two different plans.Calculation results show that the recirculating region and back silting of Plan 2 are smaller than those of Plan 1.
3.As one aspect in the development of our nation-wide guerrilla warfare, we should effectively organize guerrilla warfare in the Hungtse Lake region north of the Yangtse River, in the Taihu Lake region south of the Yangtse, and in all river-lake-estuary regions in the enemy-occupied areas along the rivers and on the seacoast, and we should create permanent base areas in and near such places.

