Lombach (Aare)

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Lombach
Lombach in Unterseen just before the mouth

Lombach in Unterseen just before the mouth

Data
Water code CH : 350
location Prealps

Switzerland

River system Rhine
Drain over Aare  → Rhine  → North Sea
source Alp Lombach
46 ° 44 ′ 43 ″  N , 7 ° 54 ′ 35 ″  E
Source height approx.  1564  m above sea level M.
muzzle at Unterseen in the Thunersee coordinates: 46 ° 40 ′ 46 "  N , 7 ° 48 ′ 47"  E ; CH1903:  628 647  /  169870 46 ° 40 '46 "  N , 7 ° 48' 47"  O
Mouth height 558  m above sea level M.
Height difference approx. 1006 m
Bottom slope approx. 82 ‰
length 12.2 km
Catchment area 46.75 km²
Discharge  at the mouth of the
A Eo : 46.75 km² 		MQ
Mq
 		3.16 m³ / s
67.6 l / (s km²)
Left tributaries Bodmibach
Right tributaries Traubach , Wagisbach, Büelbach
Communities Habkern , Unterseen

The Lombach is a 12-kilometer-long river in the Swiss canton of Bern , which flows into Lake Thun near Unterseen . He has worked with the Lütschine by sediment the Bödeli formed that the lake from Lake Brienz separates.

geography

course

The headwaters of the Lombach are at around 1564  m above sea level. M. on the Alp Lombach below the Augstmatthorn . The Alp also forms the headwaters of the Laublägerlibach , a source brook of the Emme, which rises just a little to the north.

From here on, it meanders mostly in a south-westerly direction through a mostly wooded valley that is bordered in the south by the Brienzergrat . He passes the village of Habkern , which is on a slope above the river. Here, with the Traubach , it receives its most important tributary.

At St. Niklausen it leaves the valley and is now straightened, touches Unterseen and finally flows out at an altitude of 558  m above sea level. M. in Lake Thun, where it has formed a small alluvial cone .

Its approximately 12.2 km long run ends approximately 1006 meters below its source, so it has an average bed gradient of 82 ‰.

Catchment area

The 46.75 km² catchment area of ​​the Lombach is located in the foothills of the Alps and is drained via the Aare and the Rhine to the North Sea.

It consists of 53.8% planted area , 35.6% agricultural area , 1.7% settlement area , 0.6% water area and 8.3% unproductive areas.

The mean height of the catchment area is 1408  m above sea level. M. , the minimum height is 557  m above sea level. M. and the maximum height at 2160  m above sea level. M.

Tributaries

  • Madgräbli ( right ), 1.2 km
  • Hüttenegggrabe ( right ), 1.0 km
  • Bodmibach ( left ), 2.8 km, 2.47 km²
  • Allmigräbli ( right ), 1.0 km
  • Schwarzbach II ( right ), 1.4 km
  • Stadelgrabe ( right ), 1.3 km
  • Gschpisgräbli ( right ), 1.2 km

Hydrology

Main hydrological strand

Direct comparison of the two upper reaches at the confluence:

Surname length

[in km]

EZG

[in km²]

MQ

[in m³ / s]

Lombach 4.9 07.55 0.52
Traubach 7.6 22.91 1.72

The longer Traubach also has the larger intake system and is richer in water. It is thus the main hydrological branch of the Lombach river system . The total length of the Lombach-Traubach line is 14.9 km.

Discharge data

At the confluence of the Lombach in the Thunersee the modeled mean flow rate (MQ) is 3.16 m³ / s. The discharge regime type is nival de transition and the discharge variability is 19.

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

Individual evidence

  1. ↑ a b Geoserver of the Swiss Federal Administration ( information )
  2. ↑ Water network in the WebGis geographic information system of the canton of Bern
  3. ↑ a b c d Topographical catchment areas of Swiss waters: sub-catchment areas 2 km². Retrieved August 2, 2018 .
  4. ↑ Topographic catchment areas of Swiss waters: Lombach (upper reaches)
  5. ↑ Topographic catchment areas of Swiss waters: Traubach
  6. ↑ "Hidden behind the mean values" - the variability of the discharge regime , p. 7
  7. ↑ The discharge variability describes the extent of the fluctuations in the mean discharge of individual years around the long-term mean discharge value.