By Barrie Bolton (Eds.)
The Fly River and its tributaries, the okay Tedi and Strickland rivers, can be found within the Western Province of Papua New Guinea. All 3 rivers have their resource within the rugged vital mountain diversity of the island and finally move, through the Fly River delta, into the Gulf of Papua to the north of Australia's nice Barrier Reef. With a catchment quarter nonetheless principally coated by means of tropical rainforest and comparatively few human population, this distant a part of Papua New Guinea offers an extraordinary chance to rfile and comprehend the dynamics of a big tropical river process principally unaffected through human activity.In 1984 the okay Tedi Mining corporation restricted begun mining copper and gold mineralisation from Mt. Fubilan, that's situated on the headwaters of the okay Tedi. In 1990, mining commence on the Porgera gold mine positioned on the headwaters of the Strickland River. for the reason that that point either businesses have intensely monitored the surroundings of the Fly River procedure to be able to larger comprehend the prospective influence of mining.This booklet is meant to gather and summarise this immense volume of knowledge, a lot of it contained in inner corporation reviews, to higher comprehend the environmental complexity and dynamics of this huge and comparatively undisturbed tropical river system.The method of be taken achieve this consequence is to solicit contributions summarising all the clinical disciplines to be coated from known specialists with adventure within the quarter. * files actual and biologic switch in a wide tropical river approach led to mostly through mining in an another way pristine environment.* this booklet brings jointly a vast rand of disciplines to supply a entire assessment of swap in a posh and dynamical tropical river approach established principally on formerly unpublished corporation reports.* the e-book offers examples of cutting-edge concepts and methodologies for tracking environmental influence in a wide river method.
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Additional info for The Fly River, Papu a New Guinea: Environmental Studies in an Impacted Tropical River System
Flow is often critical or supercritical, and the river has a high sediment transport capacity. It is also capable of transporting virtually all sediment sizes delivered both from landslides and the mine. For most of its length, the river behaves as a source zone system, transporting a large quantity of delivered sediment. Some of this sediment breaks down into ﬁner particles during transit. Most of the deposition in the Upper Ok Tedi is actually bed material in transit and can be expected to pass downstream fairly quickly, especially in the steep upper reaches.
On the Middle Fly, there is deposition down to the start of the backwater zone close to the 180 km point and then substantial ﬂuctuations in bed level. If the survey data are divided into El Nin˜o/wet period conditions and closer-to-average ﬂow conditions, two different patterns emerge. Between 1997 and 1999, sediment supply to the Middle Fly was reduced by low ﬂows in the Ok Tedi and interruptions to mine operations. 18: Change in channel area with time for the Middle Fly River. Areas were calculated for a ﬁxed reference level set as the lowest observed bankfull stage in each cross section.
Impact of dredging Future behavior of the Lower Ok Tedi largely depends on whether current dredging operation continues. Without dredging, the pre-1998 trends would continue, suggesting perhaps 2 m of additional deposition in the upper section near Ningerum, rising to 4–6 m in the riverbed at Konkonda and 2–4 m in the reach between Atkamba and D’Albertis Junction by 2010. This would mean: Channel widening throughout the reach upstream of the Konkonda meander. Extensive ﬂoodplain deposition in that reach but especially around Bige.