Solo River

Bengawan Solo

Bengawan Solo passing through Bojonegoro, East Java
Country Indonesia
Basin
Main source Mount Lawu
River mouth Java Sea
Basin size 16,100 km2 (6,200 sq mi)[1]
Physical characteristics
Length 600 km (370 mi)[1]

Solo River (alternatively, Bengawan Solo River, with Bengawan being an Old Javanese word for river) is the longest river in the Indonesian island of Java, it is approximately 600 km in length. Apart from its importance as a watercourse to the inhabitants and farmlands of the eastern and northern parts of the island, it is a renowned region in paleoanthropology circles. Many discoveries of early hominid remains have been made at several sites in its valleys, especially at Sangiran, including that of the first early human fossil found outside of Europe, the so-called "Java Man" skull.

Bengawan Solo was the crash site of Garuda Indonesia Flight 421.[2]

Geography

Solo River (or Bengawan Solo) has two sources: from the volcano of Mount Lawu, on the border between Central Java and East Java and from Kidul Mountain. In ancient time, the rise of Indo-Australian Plate redirected its stream northward. Sadeng Beach, located in Special Region of Yogyakarta, has been known as mouth of ancient Solo River, which flew southward in antiquity.

It passes through the major city of Surakarta (called Solo by the local inhabitants). An important early tributary to the Solo river is the Dengkeng River, which has its source in Mount Merapi.[3] After passing through Solo, the river flows northward around Mount Lawu, and then turn eastward into East Java in the Ngawi regency.

After Ngawi the river turns northward again, forming the boundary between Blora Regency of Central Java and Bojonegoro regency of East Java. From the town of Cepu in Blora, the river turns eastward and passes through Bojonegoro regency's capital city. From there, it continues eastward through the Lamongan and Gresik Regencies. The last part of the river's basin (roughly starting from Bojonegoro regency) is mostly flat land.[4]

Bengawan Solo's delta is located near the town of Sidayu in Gresik regency. The present delta is redirected by a human made canal.[4] The original delta flowed into the Madura Strait,[4] but in 1890 a 12 km canal was made by the Dutch East Indies authority to redirect the Solo River into Java Sea.[4][5] This was done to prevent sedimentation of mud from filling the Madura Strait and thereby preventing sea access to the important port city of Surabaya.[4]

The Solo river delta has a huge mud sedimentation flow that deposited 17 million tonnes of mud per year. This sedimentation in the delta form a cape, which has average longitudinal growth of 70 m per year.[5] This delta is known as Ujung Pangkah (Pangkah Cape).

History

Vessels on Solo river during colonial period.

Solo river was part of massive river system that once existed in Sundaland. This drainage of the river system consisted of major river in present-day Sumatra and Borneo, such as Asahan river, Musi river and Kapuas river. The river system disappeared when Sundaland was submerged after sea level rise following the last Ice Age.[6]

The river played important part in Javanese history. Its drainage basin is an important agricultural area, dominated by rice farming. The river transported fertile volcanic soil downstream, replenishing the soil. It also provided link between Javanese port cities in the northern coast and the rice-growing hinterlands, with shallow vessels transporting rice to the ports to be sold.[7] This rice is Java's main commodity that was traded as part of the Spice trade.

Following acquisition of much of Java by the Dutch colonial governmental, various cash crops was introduced to be planted across the river basin, such as coffee, sugar and cotton. (see Cultivation System).

By the last years of 19th century, river sedimentation in its original delta in Madura Strait started to disrupt vessels traffic in port of Surabaya. The Dutch colonial government decided to divert the river flow away from the shipping lane into Java Sea. They built a canal in the river's delta in 1890s which still alter the river until this day.[8]

In 1891, Dutch paleoanthropologist Eugène Dubois discovered remains of what he described as "a species in between humans and apes". He called his finds Pithecanthropus erectus ("ape-human that stands upright") or Java Man. Today, they are classified as Homo erectus ("human that stands upright").[9] These were the first specimens of early hominid remains to be found outside of Africa or Europe.

Resource management

Brantas River Public Corporation or Perum Jasa Tirta I (PJT1) is responsible for managing the water resources of Brantas and Bengawan Solo river basins in Indonesia.[10] It is a centralised effort to:

Prior to the centralised management efforts, there were reports of pollution along the Bengawan Solo .[11]

Media depiction

Inspired by the river, Gesang Martohartono created a song named after the river. Bengawan Solo became a popular folk song in Indonesia.

References

  1. 1 2 Land resources information systems in Asia: proceedings of a regional workshop held in Quezon City, the Philippines, 25–27 January 2000. Food and Agriculture Organization. 2000. p. 58. ISBN 9789251045169.
  2. ↑ Walling, Michael G. (2010). In the Event of a Water Landing. Cutter Publishing. p. 72. ISBN 9780982855300.
  3. ↑ Santoso, Suwito; Kestity Pringgoharjono (2006). The Centhini story: the Javanese journey of life : based on the original Serat Centhini. Marshall Cavendish. p. 148. ISBN 9789812329752.
  4. 1 2 3 4 5 Whitten, Tony; Roehayat Emon Soeriaatmadja; Suraya A. Afiff (1996). The ecology of Java and Bali. Oxford University Press. p. 129. ISBN 9789625930725.
  5. 1 2 Journal of Southeast Asian earth sciences, Volumes 2-3. the University of California: Pergamon. 1989.
  6. ↑ Simanjuntak, Truman (2006). Archaeology: Indonesian perspective : R.P. Soejono's festschrift. Yayasan Obor Indonesia. p. 72. ISBN 9789792624991.
  7. ↑ Wink, André (2004). Indo-Islamic society, 14th-15th centuries. Brill. p. 54. ISBN 9789004135611.
  8. ↑ Dick, Howard W. (2003). Surabaya, city of work: a socioeconomic history, 1900-2000. NUS Press. p. 418. ISBN 9789971692643.
  9. ↑ "Eugene Dubois". Retrieved on 2008-06-02 from http://www.mnsu.edu/emuseum/information/biography/abcde/dubois_eugene.html.
  10. ↑ "Brantas River Public Corporation".
  11. ↑ J. E. Sahetapy. Invisible victims of Indonesia : a concise report on environmental Pollution. Universitas Airlangga Surabaya Indonesia. p. 2.

Further reading

Wikimedia Commons has media related to Bengawan Solo.

Coordinates: 6°47′S 112°33′E / 6.783°S 112.550°E / -6.783; 112.550

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