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Site Description |
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Progo estuary is the largest estuary in D.I. Yogyakarta (about 500 metre wide). The Progo river originates far from the north of D.I. Yogyakarta (Temanggung district), with catchment area includes mountain area of Sumbing, Merbabu, and Merapi mountains. The river ends (the estuary) at Indian Ocean.
The lower course and estuary of Progo, is seasonally flooded. During the peak of rainy season, the lower river basin is fully flooded (500 metre wide), and often erotion process of river banks occur. Yet, during dry season, water level is minimum, and the river basin is exposed. On the river levees, quite often being used as cultivation area (corn, grass, and other crops).
The west levee of Progo river is a bare, unvegetated area (about 300 meter from the estuary), and only sand/mud flats occur. During rainy season, water hyacinth (Eichornia crassipes) is widespread. This weeds originates from Galur river which ends at Progo river. At further distance from estuary (more than 300 m), Pandanus vegetation (Pandanus tectorius) occur. The east levee of Progo river (including coastal area of Pandasimo, Srandakan, Bantul) no vegetation occur, and only bare beaches, which are exposed with sea waves.
The estuary of Progo river is not stable (changed time to time) due to seasons, water flow, and sea wave of Indian ocean. A lagoon occur on Trisik beach (included in Progo estuary system), with average water depth 2.5 meter. The lagoon is flooded when high water flow of the river meets the high tide of the sea.
Salinity of Progo estuary is between 0-20 %. In 1995 during low tide the salinity is 0.38 and 19.4 during high tide. Water fluctution is between 0.4-2 meters.
In terms of fish, juvenile fishes such as Chanos chanos, Syngnatus acus, Megalops cyprinoides and Luntjanus spp. often occur in the area. Other fishes include Anguila spp. and Glossogobius fiuris, and shrimps (Macrobrachium spp.).
Fishery is the main importance for the site. Fishery productivity in July 1995 reached 170.124 kg/day.
About 300 inhabitants live near the estuary (in Trisik, Banaran villages). Agriculture is the main income for the population, with agriculture land on the levee of Progo river. Other land uses and human activities are fishing and husbandary. Progo estuary particulary the Trisik beach is one tourim site in the area. Fishing activity commonly occur during neap tide, in coastal area, offshore, and in the lagoon.
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Site Location |
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Progo estuary is located between Kulonprogo and Bantul districts, D.I. Yogyakarta. The site is located about 35 km south-east Yogyakarta. To visit the site, a regular bus serves as public transport from Yogyakarta to Trisik beach, Kulonprogo (1-1.5 hours). From Trisik beach, one has to walk to the east about 2.5 km. |
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Special Memmo |
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Progo estuary is the largest estuary in D.I. Yogyakarta. The estuary is known to be important site for fishery. |
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