WIA System Development for Discharge Measure in Stream

Kim Ji-hyun, Lee Nam Joo, Yu Kwonkyu

Friday 3 july 2015

12:36 - 12:39h at Central America (level 0)

Themes: (T) Water resources and hydro informatics (WRHI), (ST) Management support systems and serious gaming, Poster pitches

Parallel session: Poster pitches: 15H.WRHI - SeriousGaming

In order to manage streams accurately and systematically, we need to obtain enough data on the stage-discharge of each stream. However, stage-discharge measurements are difficult to carry out due to problems of expense, time, and manpower. Also, studies on the related techniques are insufficient and have a narrow range. Especially, there is a lack of data on stage-discharge for small and medium sized streams. Therefore, the lack of real-time measurement data on the small and medium sized streams results in less accurate numerical value analysis. Hence, in order to manage streams correctly and systematically, we need to develop a technique and device that can obtain real-time measurement data on streams economically. With the advancement of IT technology of image acquisition and wireless transmission technology, WIA (Wireless Image Acquisition) has been incorporated into stream engineering. This system can provide stage-discharge video data to calculate the real time flow rate and water level at a low cost. With this WIA system, it is possible to procure data in real time with less than 20% of the cost of existing equipment. WIA System, which is comprised of raspberry Pi, three Infrared camera, and solar thermal electricity stand-alone system, measures the water level or flux in real time. Also, it includes Wireless Broadband function(Kim, 2008; Park, 2008). The measurement method is to obtain images of the transverse structure of the upper, middle and surrounding structure of the stream at regular time intervals, using an infrared camera where there is no change in cross-section. Then, these video data are transmitted to the central processing unit. In addition, the WIA system telemeters the water levels in the images from a three-way video stream sent from the WIA system server and provides the data on cross-sectional level of flow estimation of the stream in real time through the Internet. Also, the provided data on water stage-discharge in connection with numerical analysis are used to calculate water stage-discharge in real time for the unmeasured point.