Asahan River

Last updated
Asahan River
Sungai Asahan, Aek Asahan
COLLECTIE TROPENMUSEUM De bron van de Asahanrivier bij de brug te Porsea Sumatra TMnr 10007236.jpg
Spring of the Asahan River at Porsea, Toba Samosir (1929)
Indonesia Sumatra relief location map.jpg
Red pog.svg
Indonesia relief location map.jpg
Red pog.svg
Location
CountryIndonesia
Physical characteristics
Source 
  locationLake Toba, Porsea, Toba Samosir, North Sumatra
  coordinates2.434866, 99.147690
  elevation950 m (3,120 ft)
Mouth  
  location
Strait of Malacca
  coordinates
3.03333°N 99.866667°E
  elevation
0 m
Length147 km (91 mi)
Basin size7,225.45 km2 (2,789.76 sq mi) [1]
Discharge 
  locationNear mouth
  average(Period: 1971–2000)265.7 m3/s (9,380 cu ft/s) [1]

The Asahan River (Indonesian : Sungai Asahan) is one of the principal rivers in North Sumatra, Indonesia, that begins in Porsea, Toba Regency near the southeast corner of Lake Toba. [2]

Contents

Hydrology

The river flows in a north-easterly direction, cutting through the upper course of the deep valley in the Barisan Mountains in Toba Regency, then flows through the Asahan Regency and eventually empties into the Strait of Malacca

The largest city on the Asahan is Tanjungbalai, Asahan with a population of more than 180,000 people. The river houses the Sigura-gura Dam, which supplies power to the North Sumatran Province.

Tributaries of the Asahan include the Silang, Silau, Nantalu, Masihi, Lauran, and Baru River.

Geography

The river flows along the northeast area of Sumatra with predominantly tropical rainforest climate (designated as Af in the Köppen-Geiger climate classification). [3] The annual average temperature in the area is 23 °C. The warmest month is March, when the average temperature is around 25 °C, and the coldest is May, at 23 °C. [4] The average annual rainfall is 2950 mm. The wettest month is November, with an average of 381 mm rainfall, and the driest is June, with 117 mm rainfall. [5]

See also

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References

  1. 1 2 "Sumatra".
  2. Sungai Asahan at Geonames.org (cc-by); Last updated 2013-06-04; Database dump downloaded 2015-11-27
  3. Peel, M C; Finlayson, B L; McMahon, T A (2007). "Updated world map of the Köppen-Geiger climate classification". Hydrology and Earth System Sciences. 11. doi: 10.5194/hess-11-1633-2007 .
  4. "NASA Earth Observations Data Set Index". NASA. 30 January 2016. Archived from the original on 10 May 2020. Retrieved 3 January 2019.
  5. "NASA Earth Observations: Rainfall (1 month - TRMM)". NASA/Tropical Rainfall Monitoring Mission. 30 January 2016. Archived from the original on 11 May 2020. Retrieved 3 January 2019.