摘要
在土壤侵蚀和水土流失研究中，坡面径流流速是径流计算、土壤侵蚀预报中不可缺少的水动力参数，目前尚无广泛应用的径流流速测量仪，研究快速的径流流速测量具有重要意义。该文基于互相关理论，建立了基于虚拟仪器Lab VIEW的径流流速的测量系统，并采用自制的电导式传感器，研究了两传感器间距对测量系统的影响，测量了5个泥沙含量水平下的径流流速。结果表明：测量系统适用的泥沙含量范围为0～250kg／m^3，测量误差为4．5％；若以染料示踪法测量的流速作为标准值进行修正，修正后的测量误差为3．81％。
In the research of the soil erosion and soil losses, the runoff velocity of slope is an indispensable hydrodynamic parameter in the runoff computation and the soil erosion forecast. There is still no special instrument which is widely used to measure runoff velocity. It is very significant to construct a fast measurement instrument on runoff velocity. On the basis of correlation theory, the runoff velocity measurement system was established based on virtual instrument LabVIEW. The system uses the conductance sensor to acquire signal. Effect of the space between conductance sensors on the measurement system and the runoff velocity under five sediment concentrations were studied. Results indicate that the suitable sediment concentration scope of the measurement system is 0～250 kg/m^3 and the greatest relative error of the system is 4.5 %. While taking the flow velocity measured by the dye tracer technique as standard value to correct the correlation velocity, the greatest relative error of the proved velocity reduces to 3.81%.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2007年第2期1-5,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(10501-92)
