摘要
坡面径流流速是土壤侵蚀研究中的一项重要参数,目前仍未有通用的径流流速测量仪,因此研究径流流速的有效测量方法具有重要的意义。该研究以相关测速理论为基础,在已有的研究基础上改进了光电传感器的硬件设计和试验平台,开发了一套坡面径流流速测量系统。试验研究了传感器与液面及两传感器之间距离对测量系统的影响,并进行了室内模拟坡面径流流速试验研究。结果表明,两传感器的间距为5 mm、液面距离为9 mm为最优试验参数,测量系统的泥沙含量适用范围为0～400 kg/m3、坡面的范围为0～25°,测量系统能够准确测定径流流速,最大相对误差为3.61%,为坡面径流流速的快速、准确测量提供了一种有效的方法。
The velocity of hill-slope runoff is an important parameter for soil erosion and its prediction, however, there is no special and widely used instrument for runoff velocity measurement. Therefore, it is very significant to investigate the method and measurement of runoff velocity. On the basis of previous research, a runoff flow velocity measurement system based on cross-correlation and Virtual Instrument was improved from redesigning the photoelectrical sensor and experiment platform. The optimal distance between sensors, the distance between sensor and water flow surface and the runoff velocity experiment was investigated. The result indicated that the optimal distance between sensors is 5mm and the optimal distance for surface is 9mm. The measurement system is suitable for sediment contents of 04400 kg.m^-3 and for slope gradients of 0～25°, the measured result showed the highest relative error of runoff velocity is 3.61%, which indicates the accurate measurement of the system. This measurement system provides a quick and accurate method for runoff flow velocity measurement.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2008年第3期48-52,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
中国科学院、水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目(10501-166)
