引江补汉工程补水口位于丹江口大坝下游安乐河出口约5 km处,且补水量与调水量基本一致,工程对航道的影响主要体现在减水段,为恢复枯水期通航水位需要开展航道综合治理。利用河工模型试验论证了综合治理方案的效果,并对方案进行了优化及进一步论证。结果表明,减水-补水212 m³/s方案尾门水位分别为86.47、85.90 m条件下,引航道口—黄家港段水位下降,黄家港以下水位保持不变,其中引航道口水位下降幅度最大,分别下降0.08、0.19 m;综合治理方案1实施后引航道口水位下降均为0.02 m,减水段的水位仍未恢复至调水前的水平,主因是从安乐河口补水的水流并未能进入到左侧主航道内;基于试验研究结果,建议对综合治理方案进行优化,在沧浪洲出水口下沿布置2道护底带;通过试验论证了护底带的4个高程,建议护底带高程为85.5 m,并对护底带高程进一步细化论证;优化后的方案可使引航道口至黄家港段的水位略超过调水前的水平,其中引航道口处最大水位抬高0.06 m。

The water replenishment inlet of the Yangtze-to-Hanjiang River Diversion Project is located approximately 5 kilometers from Anle River outlet downstream of the Danjiangkou Dam, with the replenishment volume matching the diversion volume. The project’s impact on the waterway primarily manifests in the water reduction section. Comprehensive management is essential to restore navigable water levels during dry season. The effectiveness of the management plan was evaluated using a river engineering model, and the plan was optimized and further verified. Results indicate that, under the tailgate water levels of 86.47 meters and 85.90 meters for the 212 m³/s water reduction-replenishment plan, the water level from the diversion channel entrance to Huangjiagang decreases, while the water level downstream Huangjiagang remains unchanged. Notably, the water level at the diversion channel entrance experiences the largest drop, decreasing by 0.08 meters and 0.19 meters, respectively. After the comprehensive management plan 1 is implemented, the water level at the diversion channel entrance is reduced by 0.02 meters. However, the water level in the water-reduction section does not recover to pre-diversion levels, primarily because replenished water from the Anle River estuary fails to enter the left main waterway. Based on these experimental results, it is recommended to optimize the management plan by installing two bottom protection belts along the lower edge of the Canglangzhou outlet. Experiments identified four elevation values for these belts, with a recommendation to set the elevation at 85.5 meters. Further detailed analysis supports this elevation. The optimized plan is expected to slightly elevate the water level from the diversion channel entrance to Huangjiagang above pre-diversion levels, with a maximum increase of 0.06 meters at the channel entrance.