Monitoring of water in the natural environment
It was following record rainfall in the region that the SYSMAGEB (EPTB du Boulonnais) measurement network was inaugurated. The inauguration, held on the morning of Tuesday 5 November 2019, had been scheduled for several weeks, but rainfall during the night before came to test the installations.
Indeed, it was following 42.6 mm of rain at La Capelle and 47.6 mm at Marquise (SYMSAGEB stations) in the previous 24 hours (including 35 mm in 7 hours), that the elected representatives of the communes of Le Boulonnais present were able to discover the installations on the Liane, Slack and Wimereux watersheds.
The network set up will make it possible not only toalert SYSMAGEB according to level and rainfall thresholds, but also to bank the measured data, in order toimprove knowledge of the basins and their reactions.
A network of 10 LNS stations feed the sensors with a time step of 6 minutes, record the data, and transmit them to the supervision system (developed and hosted by the company SEGI) using a GPRS/3G modem.
Depending on the measured values, the data are sent between 15 min (crisis period) and 6 h (normal period) to the supervisor.
Precipitation measurements are carried out by PLV400 rain gauges, level measurements by CR420 radars and SNA piezometric probes. Turbidity measurements (Aqualabo) are also recorded by LNS stations, and one point benefits from a velocity measurement (Nivus) in order to know the influence of the tide on the flow.
The very low consumption of the PARATRONIC materials made it possible to install (by the company SEMERU) the majority of the points in solar power supply or exclusively on battery, in order to reduce the civil engineering works.
LNS acquisition stations have been specially developed to meet this type of problem: monitoring of sensitive natural environments by sensors, data banking and transmission, triggering of alerts, etc.
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