黄茅海河口湾现代动力地貌体系和冲淤过程分析

THE MODERN DYNAMIC GEOMORPHOLOGICAL SYSTEM AND EROSION-DEPOSITIONAL PROCESS ANALYSIS OF HUANGMAOHAI BAY, WEST OF ZHUJIANG RIVER ESTUARY

1980—1993年对黄茅海河口湾进行沉积物采样和水流测定及水深测量。根据水动力和地形条件，冲淤分析及Mclaren模型研究河口湾的动力地貌体系、冲淤特征和现代沉积物运移。结果表明：（1）水下地形主要为下泄流或上溯流控制的“深槽－槽沟－浅滩－湾口”的动力地貌体系，反映了河口湾“东进西出”的水流格局；（2）整个河口湾以淤积为主，只有崖门深槽有较明显的优势冲刷特征，并随着崖门深槽向海推移和河口湾“东进西出”水动力作用，黄茅海落潮三角洲相应向西南进积；（3）应用Mclaren模型揭示了黄茅海河口湾现代沉积物运移规律，同样反映了河口湾具有“东进西出”的运移趋势。

According to hydrodynamic condition, topographic regime, erosion－deposition rate and Mclaren Model (1985), we have studied the dynamicgeomorphological system, erosion－depositional characteristics and transport trend ofthe modem sediments in Huangmaohai Bay. These studies have shown that: (1)Underwater topography of Huangmaohai bay is chiefly in the form of such a dynamic geomorphological system as ' deep trough－small channel－shallow flat (or shoal)－estuary entrance that is controlled by downward or upward flow, representingthe flow system of 'In East－Out West' in the bay; (2) Except that Yamen deeptrough is obviously erosional, with the characteristics that Huangmaohai ebb delta isprogradating to the southwest region of the bay in accompaniment with the seawardmovement of Yamen deep trough and the 'In East－Out West' regime; (3) Theapplication result of Mclaren Model (1985) in the bay has further probed thetransportation trend of modern sediments, especially elucidating that sedimenttransportation trend of the bay has the same rule of 'In East－out West' as theflow system.