Evaluation of total sediments movement on the Abukuma River and the Sendai Bay Coast

1.根据1984年以来对阿武熊河口地貌的实地调查结果，从不同的时间尺度对河口泥沙运动和泥沙平衡进行了研究。结果表明，河口具有纳沙作用，其纳沙量与外力输沙量之比控制着泥沙运动的时间尺度.模拟了阿武熊川上游至河口的径流和输沙量，合理评价了阿武熊川对仙台湾沿岸的泥沙供给.考察了仙台湾沿岸和福岛沿岸的形态变化、沉积物特征和沿着波浪，定量评价了仙台湾沿岸的沉积物平衡.综合上述结果，对阿武熊川和仙台湾沿岸的沿着泥沙运动进行了评价。指出仙台湾海岸由于泥沙供给不足和沿着流沙的阻挡，使其由动力平衡状态向不平衡状态转变.针对仙台湾沿岸沿着泥沙的不平衡状态，考虑了工程措施。

1. Reexamining the results of field survey on the Abukuma River mouth morphology conducted by ourselves since 1984, sediment movement and sediment balance were studied from various time scale of view. It was shown that the estury have a function as a pocket for sediment and the time scale of sediment movement are controled by the ratio of this volume and the sediment flux by the external forces.2. A water runoff and sediment discharge of thle Abukuma River was modeled from the upper reach to the river mouth and the sediment supply from the river to the Sendai Bay Coast was reasonably evaluated.3. Morphology changes, sendiment characteristics and waves along the Sendai Bay Coast and the Fukushima Coast were examined and the sediment balance of the Sendai Bay Coast was evaluated quantatively.4. Combining the above results, the total sediment movement was evaluated both along the Abukuma River and the Sendai Bay Coast. It was pointed out that the Sendai Bay Coast was changed its state from dynamic equilibrium to the unequilibrium state because of lack of sediment supply and the obstraction of sand drift along the coast.5. The engineering measures were considered for the unequilibrium state of sediment along the Sendai Bay Coast.