USE OF DREDGING DESIGN AND NUMERICAL MODELLING TO INCREASE SLACK WATER ACCESS TO THE PORT OF MACKAY

The Port of Mackay is a key strategic port within the portfolio of North Queensland Bulk Ports Corporation Ltd (NQBP), accommodating the import and export of goods that support the economy of central Queensland. The Port caters for a wide variety of vessels. Vessel arrival navigation and maneuvering is currently constrained due to existing physical, environmental, and operational conditions at the harbour entrance particularly due to coastal tidally driven cross currents. NQBP engaged Royal HaskoningDHV (RHDHV) to review and assess options to alleviate vessel access constraints primarily through modifications to the physical harbour entrance infrastructure. This report summarizes the success of an alternative approach devised to increase the slack water arrival windows at the Port.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/Gg2HWtu4NCU

The rock shelter Abrigo del Molino (Segovia, Spain) and the timing of the late Middle Paleolithic in Central Iberia

The timing of the late Middle Paleolithic and late disappearance of Neanderthals in the Iberian Peninsula are hotly debated subjects in Paleolithic archeology. Several studies suggested a late survival in South and Central Iberia until about 32 ka, but were probably subject to significant age underestimation due to contamination of dating samples, undiagnostic lithic assemblages, and/or lack of stratigraphic integrity. We conducted a radiocarbon and luminescence-dating study backed by detailed sedimentological and micromorphological investigations at the newly discovered rock shelter sequence of Abrigo del Molino (Central Spain). Accumulation of the sediment sequence was rapid. It started with deposition of paleoflood slack-water deposits at around 48 ka and continued until about 41 ka with deposition of colluvial and detrital sediments. These contain two Mousterian levels, which place the latest Neanderthal occupation at around 45 to 41 ka, i.e., between Heinrich Stadials 5 and 4, and probably during a time of climate amelioration. Abrigo del Molino thus provides a detailed and chronologically well-constrained record of Late Neanderthal presence and morphodynamic change in Central Iberia during times of millennial-scale climate changes. The site gives further evidence for an early disappearance of Neanderthals in Central Iberia.

Indikator Penciri Penanggalan Hijriah pada Pergerakan Pasang Surut

Rhythmic movement of the tides follow the movement of the moon,as the dominant component of which has a rhythmic, should the movement of tidal inform month trip in the form of style variations of tide generating force (GPP) which indicates the time in the Hijra calendar. This article aims to determine the indicator of the tidal movement indicating the time of the Hijri calendar. The timing of slack water (t sw) the movement receded into pairs (tsw s) in peak II relatively consistent for the three months of data were analyzed tidal movement. Consistency is shown on the results of the statistical analysis by comparing the Probability (Pr) to the Wilks’ Lambda ( ) is very small(<0.0001) which means that the time of slack water (t sw) can be a primary identifier in determining the Hijra calendar. Further research is needed to determine the time point t SWS belt of a general nature in order to facilitate the determination of the Hijra calendar through the movement of the tides.DOI: 10.15408/ajis.v17i2.5686

Paleoflood records from sinkholes using an example from the Ebro River floodplain, northeastern Spain

This work introduces for the first time the concept of using sinkholes in fluvial valleys as recorders of past floods. The notion is illustrated through the investigation of a complex sinkhole located in a broad floodplain underlain by salt-bearing Cenozoic evaporites. This active sinkhole comprises a large subsidence depression affecting the floodplain and the edge of a terrace, and a nested collapse sinkhole that used to host a sinkhole pond. A borehole drilled in the buried sinkhole pond revealed an ~7.8-m-thick fill that records around 2700 yr of clayey lacustrine deposition interrupted by three types of detrital facies. Two thick pebble gravel beds have been attributed to major high-competence floods: a paleoflood that occurred in Visigothic times (1537–1311 cal yr BP) and the 1961 Great Ebro River Flood, which is the largest event of the instrumental record. A trench dug in the portion of the terrace affected by subsidence exposed a mid-Holocene slack-water paleoflood deposit. The disadvantages and advantages of sinkholes as archives of past flood histories are discussed.