摘要
用DR300型宽幅ADCP在胶洲湾口门进行了走航式断面观测。观测期间悬沙浓度小于40mp／L，悬沙粒度分布曲线具有双峰特征，调查船航速为2—3m／s。用水样过滤法率定相应的ADCP声学信号，获得了计算悬沙浓度的半经验公式及悬沙浓度剖面分布数据。分析结果表明，即使在悬沙浓度较低、悬沙分选性较差、船速较高等不利于ADCP观测的现场条件下，测量误差仍与光透式浊度计的误差相当。因此，在走航状态和低悬沙浓度条件下，用宽幅ADCP测定悬沙浓度是可行的；这一方法在浅海区域的应用可以使悬沙浓度测量效率得到大幅度提高。
A DR300 Broad Band ADCP mounted on a moving vessel (with a speed of 2-3m / s)was used to measure the profile of suspended sediment concentaions- The measarements were undertakn at the entrane to Jiaozhou Bay, Shanclong Pehinsula (where the water is associated with a low suspended sediment concentration during a spring hde. The echo intensity data produced by the ADCP have been transformed into suspended sediment concenedon data on the basis of in situ calibration- The results show that the calibrated curve can be used tD calculato the suspended sediment concentration, with a relahve error of aroUnd 32%. thnce,it is feasible to measme the suspended sediment concentration using the ADC mootd on a moving vessel with a relative high speed. Further, this technique can be appied to the measarement of low suspended sediment concendons. Compared with transhosometers and conventional asoushc backscatters, the ADC rePresents a potenhally powerful tool to obtaln suspended sedimellt concentration data with a high efficiency in conhnental shelf warers.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1999年第6期758-763,共6页
Oceanologia Et Limnologia Sinica
基金
中国科学院院长基金!A1097020
国家杰出青年科学基金!49725612
