Lembe (river)

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Lembe
Lembaz
image
Data
Water code CH : 3152
location Switzerland
River system Rhine
Drain over Broye  → Zihl Canal  → Aare  → Rhine  → North Sea
Headwaters south of the Bois de la Rigne ridge near Thierrens
46 ° 42 ′ 52 ″  N , 6 ° 46 ′ 9 ″  E
Source height approx.  780  m above sea level M.
muzzle at Granges-près-Marnand in the Broye coordinates: 46 ° 45 ′ 43 "  N , 6 ° 53 ′ 34"  E ; CH1903:  558300  /  179119 46 ° 45 '43 "  N , 6 ° 53' 34"  O
Mouth height approx.  465  m above sea level M.
Height difference approx. 315 m
Bottom slope approx. 22 ‰
length 14.3 km
Catchment area 26.69 km²
Drain
at the mouth 		MQ
 410 l / s

The Lembe , also called Lembaz , is a 14 km long left tributary of the Broye . It drains a small section of the central plateau of French- speaking Switzerland, flowing through areas of the cantons of Vaud and Friborg .

geography

course

The headwaters of the Lembe are located south of the Bois de la Rigne ridge in the municipality of Thierrens (Canton of Vaud), at about 780 m above sea level. M. in the Molasse hill country between the valleys of the Mentue in the west and the Broye in the east. The Lembe flows northeast in a relatively wide valley and is flanked by the ridges of the surrounding Molasse hills (700 to 800 m above sea level). At Prévondavaux the brook crosses into the canton of Freiburg ( exclave Surpierre ). Below Cheiry , the Lembe turns in a gentle curve to the east, reaches Vaudois soil again, flows through the valley of Les Vaux and emerges at Granges-près-Marnand into the middle Broyetal. Here it flows out at 465 m above sea level. M. in the Broye. Except in the source area, the Lembe has a fairly constant gradient of around 2%.

Catchment area

The catchment area of ​​the Lembe is 26.69 km² and consists of 30.7% forest land , 63.4% agricultural area and 5.8% settlement area .

The mean height of the catchment area is 674  m above sea level. M. , the minimum height is 462  m above sea level. M. and the maximum height at 833  m above sea level. M.

Tributaries

  • Le Pessonnet ( right ), 2.0 km, 2.11 km²
  • Le Ruisseau Pra au Blance ( right ), 0.7 km, 0.62 km²
  • Le Flon ( left ), 2.8 km, 6.5 km²
  • Le Ruisseau de la Boveire ( left ), 1.2 km, 1.44 km²

Hydrology

At the confluence of the Lembe and Broye, its modeled mean flow rate (MQ) is 0.41 m³ / s and its flow regime type is nivo-pluvial jurassia .

The modeled monthly mean discharge (MQ) of the Lembe in m³ / s

character

The Lembe moves in a largely natural stream bed, only the lowest section through the village of Granges-près-Marnand is canalized.

use

The Lembe's hydropower has been used to operate mills and sawmills in the Vallon de la Lembaz since the Middle Ages .

Web links

Commons : Lembe  - collection of images, videos and audio files

Individual evidence

  1. ↑ Geoserver of the Swiss Federal Administration ( information )
  2. ↑ a b c d Topographical catchment areas of Swiss waters: Lembe
  3. ↑ "Hidden behind the mean values" - the variability of the discharge regime , p. 7