Disdrometer and Tipping Bucket Rain Gauge Handbook

MJ, Bartholomew.

Pacific Northwest National Laboratory (U.S.)

关键词: Manuals;    Reflectivity;    Sensors;    Rain;    Radar;   

DOI  :  10.2172/1019411
RP-ID  :  DOE/SC-ARM/TR-079
RP-ID  :  DE-AC05-7601830
RP-ID  :  1019411

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Distromet disdrometer model RD-80 and NovaLynx tipping bucket rain gauge model 260-2500E-12 are two devices deployed a few meters apart to measure the character and amount of liquid precipitation. The main purpose of the disdrometer is to measure drop size distribution, which it does over 20 size classes from 0.3 mm to 5.4 mm. The data from both instruments can be used to determine rain rate. The disdrometer results can also be used to infer several properties including drop number density, radar reflectivity, liquid water content, and energy flux. Two coefficients, N0 and Λ, from an exponential fit between drop diameter and drop number density, are routinely calculated. Data are collected once a minute. The instruments make completely different kinds of measurements. Rain that falls on the disdrometer sensor moves a plunger on a vertical axis. The disdrometer transforms the plunger motion into electrical impulses whose strength is proportional to drop diameter. The rain gauge is the conventional tipping bucket type. Each tip collects an amount equivalent to 0.01 in. of water, and each tip is counted by a data acquisition system anchored by a Campbell CR1000 data logger.