PRE-FEASIBILITY STUDY OF USING SANDBYPASSING SYSTEM AND INITIAL DESIGN CRITERIA, A CASE STUDY IN CASPIAN SEA

سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 326

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شناسه ملی سند علمی:

ICOPMAS13_078

تاریخ نمایه سازی: 6 بهمن 1397

چکیده مقاله:

Generally, coastal structures could be impediments to natural flow of sand. Sedimentation and erosion close to small ports are acute problems and there is no generalconsensus on appropriate measures to mitigate their adverse effects. Some mitigating approaches include beach nourishment and sediment bypassing. Sand transfersystems are a means of transporting sand around an impediment in an attempt to reinstate the flows of sand that would occur naturally [1]. Sand bypassing systems operateon simple principles, and consist of dredging, transporting and depositing sand. Mechanical bypassing is an approach to transport sediment from the updrift to the downdrift sideof ports or inlets. Bypassing can be achieved through dredging or excavator and truck delivery. Many sand bypassing systems have been being designed and operatedin the last decades. Boswood and Murray [2] list 53 different bypassing stations from around the world and document their environmental and system parameters. Apump or eductor is used for dredging operations with bypassing systems which could be a water-based mobile system: where the dredge pump is operated from afloating, mobile platform, or a land-based mobile system: where the dredge pump is generally operated by a crane, or a fixed system: where the dredge remains in a singlelocation ([1], [2], [3]). Since construction of Chamkhaleh port (the former port located in Guilan, The Caspian Sea), heavy sedimentation behind the west breakwater and rapid shoreline advance have been observed. Also the port basin was located at river mouth which itself was at the influence of two rivers discharge. Inaccurate layout of the breakwaters has caused a calm region for siltation and accumulation of fine sediments in the port basin and eventually led to disruption in the port operations in recent years (see Figure 1). Therequired offshore data providing important information for the detailed 2D morphological assessment and 1D littoral drift study of Chamkhaleh coastal area has been extractedfrom two wave hindcasting projects of ISWM I (covered 1992 to 2003 at 6-hour intervals), and monitoring and modeling study of northern coasts of Iran (covered 1983 to2013 at 1-hour intervals). Comparison of hydrographic surveys (years: 1998, 2010, 2012, 2014, 2017), satellite images and aerial photos has shown the average annual netlong shore sediment transport (LST) rate is about 100,000 m3 from west to east ([4]). This paper presents some results of Chamkhaleh’s port development plan proposed byKaran Sazeh Pasargad consulting engineers Co.

نویسندگان

Amin Reza Zarifsanayei

enior coastal engineer at Karan Sazeh Pasargad consulting engineers Co,Tehran, Iran

Shahin Maghsoudi Zand

CEO at Karan Sazeh Pasargad consulting engineers Co,Tehran, Iran