我站是山谷河道,断面窄,水深流急,但又不同于一般山谷河道,断面冲淤大,变化快。在施测洪水中,测量洪水时的断面就更为需要了。以往在缆车上测保,因工作人员距水面很高,仅凭测锤入水面后略松测绳,冲下后猛提出水面,使测锤上摆投放施测,测锤上摆幅度小,而测锤破水流冲到垂直位置时尚不能达到河底,水深即无法施测。若采用重锤在缆车上测深,操作有很多困难,用较轻的测锤,必须将测锤 I station is a valley river, narrow section, water depth and urgency, but different from the general valley river, the section scour silting large, rapid change. In surveying floods, it is even more desirable to measure the cross section of a flood. In the past on the cable car insured, because the staff from the water is very high, only by measuring the hammer into the water after the loose rope, washed down after the fierce water raised, so put the measured hammer put put on the test, measuring the hammer pendulum amplitude is small, The measured hammer broken water rushed to the vertical position fashion can not reach the river, water depth that can not test. If the use of heavy hammer in the cable car sounding, the operation has many difficulties, with a lighter hammer, hammer must be measured