新疆宽浅变迁河流桥位河段壅水研究

Backwater at bridge constrictions of broad-shallow and shifting channels in Xinjiang

新疆宽浅动床河流水深小、比降大、水流急,河床容易冲刷。建桥后,由于桥位断面压缩而导致的壅水与一般冲积河流不同。通过概化动床模型试验,得出了新疆宽浅变迁河流桥位河段壅水计算公式。动床模型公式充分反映了这类河流壅水的特点,因而与实际情况较为符合。

The broad-shallow and shifting channels in Xinjiang have characteristics of shallow water depth, steep gradients, high flow velocity and easily scoured river bed. Its backwater, due to bridge constrictions, is different from that of alluvial channels. In this paper, a simple formula is developed for estimating backwater by generalized mobile-bed river engineering model experiment. As it reflects characteristics of the broad-shallow and shifting channels in Xinjiang, author＇s formula fits in with this kind of rivers preferably.