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常涛, 高欣, 刘焕章. 梯级调度下宜昌江段径流变化对中华鲟繁殖活动影响[J]. 水生生物学报, 2019, 43(S1): 97-103. DOI: 10.7541/2016.172
引用本文: 常涛, 高欣, 刘焕章. 梯级调度下宜昌江段径流变化对中华鲟繁殖活动影响[J]. 水生生物学报, 2019, 43(S1): 97-103. DOI: 10.7541/2016.172
CHANG Tao, GAO Xin, LIU Huan-Zhang. VARIATION OF RUNOFF IN THE YICHANG REACH OF YANGTZE RIVER AND ITS INFLUENCE TO THE CHINESE STURGEON SPAWNING UNDER THE CASCADED HYDROPOWER OPERATION[J]. ACTA HYDROBIOLOGICA SINICA, 2019, 43(S1): 97-103. DOI: 10.7541/2016.172
Citation: CHANG Tao, GAO Xin, LIU Huan-Zhang. VARIATION OF RUNOFF IN THE YICHANG REACH OF YANGTZE RIVER AND ITS INFLUENCE TO THE CHINESE STURGEON SPAWNING UNDER THE CASCADED HYDROPOWER OPERATION[J]. ACTA HYDROBIOLOGICA SINICA, 2019, 43(S1): 97-103. DOI: 10.7541/2016.172

梯级调度下宜昌江段径流变化对中华鲟繁殖活动影响

VARIATION OF RUNOFF IN THE YICHANG REACH OF YANGTZE RIVER AND ITS INFLUENCE TO THE CHINESE STURGEON SPAWNING UNDER THE CASCADED HYDROPOWER OPERATION

  • 摘要: 采用基尼系数和Mann-Kendall统计法, 对1982—2017年长江中游宜昌江段的径流分配不均匀度, 以及葛洲坝下中华鲟产卵日的环境条件进行了分析, 探讨三峡-葛洲坝梯级水库调度下径流变化对中华鲟繁殖活动的影响。研究结果表明葛洲坝建坝后宜昌径流量和分配不均匀度发生趋势性下降; 受径流变化影响, 中华鲟产卵日流量和水位同步减少, 但繁殖水温无显著变化。其中, 中华鲟产卵日流量和水位与径流分配不均匀度分别在2004和2009年发生突变, 恰好与三峡水库二期和四期蓄水时间相一致。相关性分析表明: 较大的径流量和不均匀度会促使中华鲟在流量和水位较高时产卵, 但中华鲟繁殖水温需求稳定。结合以往的研究成果, 本文建议, 为满足中华鲟繁殖活动的水文需求, 应尽量提高梯级调度下径流量及分配不均匀度, 并在汛期提供长时间的高流量脉冲过程。

     

    Abstract: Based on the Gini coefficient and Mann-Kendall test, the runoff variation in the Yichang reach of Yangtze River from 1982 to 2017 was evaluated, and its influence to the Chinese sturgeon spawning below the Gezhouba Dam was discussed under the cascaded hydropower operation. The results showed that the runoff and Gini coefficient decreased significantly after the construction of Gezhouba Dam, which synchronously decreased the flow and water levels in spawning days of the Chinese sturgeon. Water temperature had no significant change. The analysis of the abruption revealed great change of hydrological conditions in the spawning days and Gini coefficient in 2004 and 2009, which are coincided with time of the second and fourth phase impoundment of the Three Gorges Reservoir. The correlation analysis indicated that the higher runoff and Gini coefficient would induce Chinese sturgeon to spawn in days with high flow and water levels. These results suggest that the ecological operation of the Three Gorges-Gezhouba cascaded hydropower could enhance the runoff with large inequality and create long duration of high flow pulses during flood seasons.

     

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