论文部分内容阅读
三峡工程蓄水运行以来,库区水位抬高,航道尺度大幅提高,航宽普遍在200m以上,峡谷河段受岸壁约束,增幅也达40～100m左右,航深4m以上,弯曲半径除局部河段外均大于1000m.分析表明:蓄水后常年库区枯水期碍航滩险消除,洪水期流量在20000m3/s以下时,基本无不良流态出现,水流平缓;流量在20000m3/s以上时,水流亦有较大减缓,变动回水区流速有所减缓.加之已实施的三峡工程施工期变动回水区航道整治工程,使常年库区及变动回水区航行条件得到较大改善,但遇洪水陡涨过程,峡谷河段仍会呈现不良流态.
Since the Three Gorges Project was impounding, the water level in the reservoir area has been raised and the waterway scale has been greatly increased. The width of the navigation channel has been generally over 200m. The gully reaches of the gorge are constrained by the seawall with an increase of about 40-100m and a depth of 4m above the bend radius, The analysis shows that after the water is impacted, pest risk of the perennial reservoir area during the dry season is eliminated, and when the flood season flow rate is less than 20000m3 / s, almost no bad flow occurs and the water flow is gentle. When the flow rate is above 20000m3 / s, The water flow also slowed down a lot, and the flow velocity in the backwater area has been slowed down.With the implementation of the waterway regulation project in the backwater area during the construction period of the Three Gorges Project, the navigation conditions in the perennial reservoir area and the fluctuating backwater area have been greatly improved, In the course of a sudden flood, gorges can still show a bad flow pattern.