Permit
| Permit | ||
 The Zulg |
||
| Data | ||
| Water code | CH : 548 | |
| location |
Mittelland
|
|
| River system | Rhine | |
| Drain over | Aare → Rhine → North Sea | |
| Headwaters | Confluence of Sulzibach , Fallbach and Kaltbach near Innereriz in the foothills of the Alps 46 ° 47 ′ 9 ″ N , 7 ° 49 ′ 21 ″ E |
|
| Source height | approx. 1030 m above sea level M. | |
| muzzle | northwest of Thun in the Aare Coordinates: 46 ° 46 ′ 27 ″ N , 7 ° 36 ′ 13 ″ E ; CH1903: 612594 / 180351 46 ° 46 '27 " N , 7 ° 36' 13" O |
|
| Mouth height | 548 m above sea level M. | |
| Height difference | approx. 482 m | |
| Bottom slope | approx. 21 ‰ | |
| length | approx. 23 km | |
| Catchment area | 88.15 km² | |
| Discharge A Eo : 88.15 km² at the mouth |
MQ Mq |
2.4 m³ / s 27.2 l / (s km²) |
The Zulg is a 23 km long right tributary of the Aare in the Swiss canton of Bern . It drains a section of the pre-Alps east of the Aare valley and belongs to the catchment area of the Rhine .
geography
Spring streams
The headwaters of the Zulg are located in the foothills of the Alps between the Sigriswilgrat , the Hohgant and the Honegg on the municipality of Eriz . The Zulg arises at Innereriz at about 1040 m above sea level. M. through the confluence of the following three source streams:
- Sulzibach , rises in the Sulzigraben between the Sigriswilgrat and the Sieben Hengsten
- Fallbach , rises in the Grüenenberg basin between the limestone stocks of the Sieben Hengste and the Hohgant
- Kaltbach , rises on the eastern slope of the Honegg and crosses the Rotmoos nature reserve
course
From Innereriz, the Zulg flows westwards through a relatively wide valley with a flat valley floor and a mean gradient of 2%. Below the hamlet of Linden, it descends into an impassable deep notch valley , the Zulggraben , and is flanked by steep rock faces. The gradient increases to an average of 4% in the middle reaches. The Zulg receives an inflow from the south through the deeply cut brooks from the Hutgraben and the Prässerental. The Zulgtal , which is sometimes up to 300 m deep, opens shortly before Steffisburg . Here the Zulg enters the Aare valley north of Thun , on the eastern edge of which it has deposited a large amount of debris over time.
It flows northwest of Thun at 550 m above sea level. M. in the Aare.
Its approximately 23 km long run ends around 482 meters below its source, so it has a mean bed gradient of around 21 ‰.
Catchment area
The 88.15 km² catchment area of the Zulg lies in the Swiss plateau and is drained to the North Sea via the Aare and the Rhine .
It borders
- in the northeast to that of the Hombach and that of the Schwarzbach , both of which flow into the Emme
- in the east to that of the Bütlerschwandgraben
- in the southeast to that of the Traubach , which drains over the Lombach into Lake Thun
- in the south to that of the Grönbach , that of the Guntebach , that of the Riderbach and that of the Hünibach , all of which flow into Lake Thun
- in the south-west to that of the small Chratzbach , which flows into the Aare
- and in the north to the catchment areas of the two Aare tributaries, Toggelisgrabe and Rotache, and to that of the Rötenbach , which flows into the Emme.
The catchment area consists of 41.8% wooded area , 47.7% agricultural area , 3.8% settlement area , 0.9% water area and 5.8% unproductive areas.
The mean height of the catchment area is 1132 m above sea level. M. , the minimum height is 546 m above sea level. M. and the maximum height at 2060 m above sea level. M.
Hydrology
Discharge data
At the confluence of the Zugl into the Aare, its modeled mean flow rate (MQ) is 2.4 m³ / s. Her discharge regime type is nivo-pluvial préalpin and her discharge variability is 20.
The modeled monthly mean discharge (MQ) of the Zugl in m³ / s
Flood
Flood events can occur when the snow melts and when there is heavy rainfall during the summer half-year. During floods, the Zulg carries a large amount of debris with it. While the middle course in the Zulggraben has been preserved in its natural state, torrent barriers were built along the upper course in order to fix the valley floor and to contain the deep erosion and the scree. The Zulg in the lower reaches of the Steffisburg area was channeled and straightened. As a measure to protect the residential areas from flooding, dams and barriers were built.
Individual evidence
- ↑ a b Geoserver of the Swiss Federal Administration ( information )
- ↑ a b c d Topographical catchment areas of Swiss waters: sub-catchment areas 2 km². Accessed January 21, 2020 .
- ↑ "Hidden behind the mean values" - the variability of the discharge regime , p. 7
- ↑ The discharge variability describes the extent of the fluctuations in the mean discharge of individual years around the long-term mean discharge value.