On Silt Deposit and Disastrous Chains Originated from Silt Deposit inDongting Lake Area

The overyear average amount of silt deposit in Dongting Lake is as high as 13×10~7 t, Long-term silt deposit contribute to special ecological environment. The special circumstance and destructive activities of people accelerated the speed of silt deposit broke the balance of ecological system, and formed secondary disastrous environment. Subsquently, the abnormal change of environment amplified the impact of silt deposit, result in the format and cocurrence of disasfrous chains in the final analysis, the gradual formation process of disastrous chains all originated from the long-term silt deposit.