Tuna (river)

The Tuna is abundant but small French river, tributary of the Oise (left bank), and thus tributary of a tributary of the the Seine. It crosses the departments of the the Ardennes and especially of the Aisne.

Geography

The catchment area of Tuna is completely located in Thiérache in the departments of the Aisne and the the Ardennes, area with abundant precipitations.

Its confluence with Oise is with Étréaupont, locality of the Département of Aisne.

Hydrology

Its flow was observed over one 41 years period (1967-2007), on the level of Origny-in-Thiérache, locality located in the Département of Aisne at little distance from its confluence.

The interannual medium flow or module of Tuna is of 3,71 m ³ a second.

The river present of the seasonal fluctuations of flow, with risings of winter carrying the average flow monthly between 5,2 and 6,9 m ³, from December to March included (maximum in February), and of thin of end of summer, in August - September, with a fall of the monthly medium flow up to 1,59 m ³ in September, which remains appreciable.

In period of low water level, the VCN3 can fall until 0,75 m ³, in the event of quinquennial dries, which is far from being severe. Let us recall that the VCN3 is the past minimal quantity or minimal flow over three days consecutive.

In addition, the risings can be rather important. The QIX 2 and QIX 5 are worth respectively 31 and 40 m ³. The QIX 10 or calculated flow of decennial rising is of 46 m ³ a second, and the QIX 20 of 52 m ³ a second. As for the QIX 50, it is assembled to 78 m ³ (see note). This implies that every two years, there is on average a rising of about 31 m ³ a second, and every ten years, a rising of 46 m ³.

Always with Origny-in-Thiérache, the recorded maximum instantaneous flow was of 54,8 m ³ a second on December 1st, 1993, while the value maximum day laborer was of 46 m ³ a second on December 21st of the same year. By comparing this instantaneous flow with the values of the QIX exposed higher, it appears that this rising was of a vicennial nature and thus at all exceptional.

The Tuna is well fed by abundant precipitations of Thiérache. The Lame of water past in its catchment area is of 455 millimetres annually, which is rather high, definitely higher than the overall average of France, and especially definitely more than that of the whole of the basin of the Seine (more or less 220 to 240 millimetres). The specific Flow or Qsp is assembled thus at 14,4 liters a second and per square kilometer of basin.

Internal bonds

the List of the rivers of France
the Greenhouse
the Oise

References

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