straight river meaning in English

顺直性河流

When the lightning glared out we could see a big straight river ahead , and high , rocky bluffs on both sides
电光一闪，只见前面是一条笔直的大河，大河两岸高高的山岩好不吓人。
The extreme effects of sand mining on local deformation of riverbed and evolution of river stretch in typical river sections such as straight river section , river bend and river fork are experimentally studied in micro - scale loose bed hydraulic model
摘要采用微尺度动床河工模型试验的方法研究了在顺直、弯道与分汊等典型河道不同部位进行大规模采砂对河床局部变形及对河段变形的极限影响。