很多堰塞湖是在地震发生后，产生泥石流，堵塞河流而形成的。
Many barrier lakes formed after the earthquake caused landslides, which blocked rivers.
公元4 ~ 7世纪间，古城上游河段曾先后两次发生河岸滑坡堵塞河水，形成堰塞湖，导致孔雀河改道，从而彻底断绝了维系楼兰古城生命的唯一水源，古城不得不被废弃而且无法复兴。
In the 4 ~ 7 century, the water resources from Kongqiu river was cut off because of old Kongqiu river changed channel resulted from landslip on upper reaches. The old city had to discard.
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