Such condition is known as positive surge. This will cause the incoming tide that propagating to upstream turns to rising. The submerged sand bar in the channel causes the depth of water to shoal, thus the celerity of tidal waves decrease.
In a case of Batang Lupar’s Tidal Bore, it occur when the incoming tides re funneled a shallow, narrowing Batang Lupar, where the area of wetted cross-section decrease upstream, accordingly the speed of flood current increases. The river mouth shape and channel Bathymetry
Some local also believe the movement of the bore ended as far as Engkelili, 47 km from Sri Aman Town.Ī tidal bore may take on various forms, ranging from a single breaking wavefront with a roller, somewhat like a hydraulic jump to undular bores, comprising a smooth wavefront followed by a train of secondary wave (whelps). As for the Sri Aman Bore, it start appeared at Pulau Seduku, Bakong and travel up to 45 km passing Sri Aman Town till it ended somewhere at Berangan. It can be 10 to 16 feet high and move rapidly 10 to 15 knots upstream faster than the rising tide. It moves upriver as incoming tidal current surges against the flow of a more narrow and shallow river, bay, or estuary. A tidal bore creates a powerful roar that combines the sounds caused by the turbulence in the bore front and whelps that can be heard far away because its low frequencies can travel over long distances. The main key features of a tidal bore are the intense turbulence and turbulent mixing generated during the bore propagation. It is a phenomenon that has never been truly understood, although the mechanism of its passage and size are fairly predictable. It occurs in relatively few locations worldwide, usually in areas with a large tidal range, typically more than 6 metres, between high and low water.
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