以下为句子列表：
英文: Effects of maintenance and raise of water level at Yichang Station by river bottom protection and roughness addition method and pool back-fill method in the reach from Yichang to Zhicheng of the Changjiang River are calculated and compared by using a 2-D
中文: 摘要运用二维水流数值模拟方法，计算比较了在宜昌～枝城的长江河段内选取重点控制河段，进行护底加糙及回填深槽对维护并抬高宜昌水位的效果。
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