Vízügyi Közlemények, 1998 (80. évfolyam)

3. füzet - Bikfalvi I.-Hamza I.: A Zala és a Kis-Balaton távmérő rendszere

504 Bikf'alvi I.—Hamza I. - a főközpont és a szombathelyi vízrajzi alközpont telefonos információszolgáltatást is végez. Az illetékesek a központot telefonon felhívhatják és a gép élőszóval tájékoztatást ad az aktuális adatokról. A távmérő rendszer kiépítése kb. 600 millió forintba kerül. A kivitel 1996-ban kezdődött el és 1998-ban fejeződik be. * * * Telemetry system of the River Zala and the Kis-Balaton reservoir system by István BIKFALVI E.E. and István HAMZA C.E. The objective of the Kis Balaton Water Protection System is to clean the water of the River Zala to the possible highest extent and to provide favourable impact on the water budget of Lake Balaton, while serving the interests of nature conservation too. The scheme includes two reservoirs which were designed in such a way as to assure the longest possible retention time of Zala water in them. The water budget of the two reservoirs are maintained by two hydraulic structures which also provide for navigation. The scheme also includes 11 pumping stations which lift inland seepage and excess waters to streams and thus to the reservoirs. Safe operation of the scheme necessitated the establishment of a telemetry system (Figure I.). The telemetry system supplies data for the operation control and for the simulation model system which is to be established at a later stage. It also provide data for the hydrographie data base. Most of the measured parameters are hydrological ones (precipitation, water stage, water flow) but water quality monitoring is also included along with other operation control parameters (those of the state of hydraulic structures and pumps) (Figure 2.) The telemetry system includes 48 units. Some of the units serve several purposes. The central unit is in Keszthely and there are six further sub-centres for different tasks. There are three FM radio transmission stations for sending the data. Data are collected from 11 pumping stations and six gates (two twin-gates). Data collected also serve for making forecasts. The linear transmission scheme of the telemetry'network is shown in Figure 3. Main characteristics of the operation of the system are as follows: — depending on the type of the parameter the monitoring frequency is generally one in every quarter of an hour. The monitoring devices include data loggers; — Upon command from the main centre the telemetry system calls the data loggers once a day, retrieving the actual on-line values. When the data exceed certain critical limit values the retrieval period will be automatically shortened; — Eventually there is an option for retrieving data at any time from any station. — The main centre retrieves the content of the data loggers once day (for the past 24 hours); The system monitors the degree of fullness of the data loggers and transmits warning for retrieving and cleaning the memories, when they are full to 75-85% — Memories of on-site loggers are retrieved monthly once by memory-cards, thus securing that no data are lost due to the malfunctioning of the telemetry system; — Upon the exceedance of pre-set limit values the monitoring station initiates warning towards the main centre; — The monitoring stations also send warning signals in the case of unauthorized intrusion. The operators use code-cards for identification. — The system accepts commands in a specific hierarchic order and subject to coded identification only.