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Model of water regulation in the Yangtze River Basin and its effects using remote sensing techniques

机译：长江流域水量调节模型及其遥感影响

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Based on remotely sensed images, about 42 000 dams, with a total storage capacity of about 270 km3, have been constructed in the Yangtze River Basin. This large volume of water amounts to nearly one-third of the total annual discharge of the Yangtze River. Reservoir construction has dramatically changed the spatial distribution of water resources in the basin. Substantial amounts of water are now impounded in the upper reaches of the basin for energy generation and the pattern of seasonal water discharge has been altered. Future anthropogenic changes could further worsen the situation as additional large hydropower projects are completed in the upper reaches of the basin. This will cause more serious ecosystem disconnectivity through the elimination of free-flowing streams. Free-flowing streams are vanishing on the mainstem and major tributaries, such as the Jinshajiang, Wujiang, Dadu, Yuanjiang and Jialingjiang, because of reservoir construction. At present, 4688 km of streams are regulated by dams and this figure could increase to 7298 km by 2025 when all the dams currently under construction are put into operation. If all the planned dams are completed, the figure could jump to 10 675 km, or about 43% of the total length of the streams. At that time, almost all the mainstem and major tributaries will be fully regulated and this could lead to very serious negative ecosystem effects by disconnecting sedimentutrient transport and fish migration.
机译：根据遥感图像，长江流域已建成约42 000个大坝，总蓄水量约为270 km3。如此大的水量几乎占长江年总排放量的三分之一。水库建设大大改变了流域水资源的空间分布。现在，在流域上游蓄积了大量的水以产生能量，并且季节性排水的方式已经改变。随着流域上游其他大型水电项目的完成，未来的人为变化可能使情况进一步恶化。通过消除自由流动的河流，这将导致更严重的生态系统不连贯性。由于水库的建设，在金沙江，吴江，大渡，jiang江和嘉陵江等主要支流和主要支流上的自由流逐渐消失。目前，有4688公里的水流由大坝调节，到2025年，如果所有目前在建的水坝全部投入运营，这一数字可能会增加到7298公里。如果所有计划的大坝都完成了，这个数字可能会跳到10675公里，约占溪流总长度的43％。到那时，几乎所有的主要支流和主要支流都将得到充分监管，这可能会通过断开沉积物/营养物的运输和鱼类的迁移而导致非常严重的生态系统负面影响。

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