Sediment Loss Rate Sample Clauses

Sediment Loss Rate.Β For the case of grab dredging at the middle CMP, there will be two dredgers working concurrently and continuously (i.e. 24 hr). Since the total production rate would be 100,000 m3/week, the individual working rate is about 297.62 m3/hr as a continuous sediment source. Sediment loss is assumed to be distributed throughout the entire water column. Sediment loss rate of 17 kg/m3 is assumed following the same assumption in the approved EIA of AEIAR-089/2005 New Contaminated Mud Marine Disposal Facility at Airport East / East Sha Xxxx Area. The rate of release (in kg/s) of sediment for one dredger working at the above maximum rate is calculated as follows: πΏπ‘œπ‘ π‘  π‘…π‘Žπ‘‘π‘’ (π‘˜π‘”/𝑠) = π·π‘Ÿπ‘’π‘‘π‘”π‘–π‘›π‘” π‘…π‘Žπ‘‘π‘’ (π‘š3⁄𝑠) Γ— π‘€π‘Žπ‘ π‘  π‘œπ‘“ π‘†π‘’π‘‘π‘–π‘šπ‘’π‘›π‘‘ πΏπ‘œπ‘ π‘  π‘π‘’π‘Ÿ π‘ˆπ‘›π‘–π‘‘ π‘‰π‘œπ‘™π‘’π‘šπ‘’ π·π‘Ÿπ‘’π‘‘π‘”π‘’π‘‘ (π‘˜π‘”β„π‘š3) = 0.0827 π‘š3⁄𝑠 Γ— 17 π‘˜π‘”β„π‘š3 = 𝟏. πŸ’πŸŽπŸ“πŸ’ π’Œπ’ˆ/𝒔 For the case of dredging with TSHD at the middle CMP, there will only be one TSHD working continuously. According to the approved EIA of New Contaminated Mud Marine Disposal Facility at Airport East / East Sha Xxxx Area (AEIAR-089/2005), it is assumed that TSHD with xxxxxx size of 4,500 m3 would be used. Following assumptions adopted in AEIAR-089/2005, about 3,050 m3 of in- situ sediments would be removed in 20 minutes for each cycle. For this modelling study, it is assumed there will be 12 trips per day each last for 20 minutes and at 2 hours interval. The maximum total production rate would be 256,200 m3/week (3). Sediment release due to disturbance by the drag heads is assumed to be 7 kg/m3 dredged (4) (5). Sediment loss is assumed to be concentrated at the bottom of the water column. The rate of release (in kg/s) of sediment for one TSHD working at the above maximum rate is calculated as follows: πΏπ‘œπ‘ π‘  π‘…π‘Žπ‘‘π‘’ (π‘˜π‘”/𝑠) = π·π‘Ÿπ‘’π‘‘π‘”π‘’π‘‘ 𝐼𝑛 βˆ’ 𝑠𝑖𝑑𝑒 π‘‰π‘œπ‘™π‘’π‘šπ‘’ π‘π‘’π‘Ÿ π΅π‘Žπ‘Ÿπ‘”π‘’ (π‘š3) Γ— πΏπ‘œπ‘ π‘  π‘…π‘Žπ‘‘π‘’ (π‘˜π‘”β„π‘š3) Γ· π·π‘’π‘Ÿπ‘Žπ‘‘π‘–π‘œπ‘› π‘π‘’π‘Ÿ π‘‡π‘Ÿπ‘–π‘ (𝑠) = 3050 π‘š3 Γ— 7 π‘˜π‘”β„π‘š3 Γ· 1200 𝑠 = πŸπŸ•. πŸ•πŸ—πŸπŸ• π’Œπ’ˆ/𝒔 Assuming a forward speed of 0.3 m/s during loading for the TSHD, the TSHD would move about 360 m forward in a 20-minute cycle. To capture this movement, the sediment source for TSHD would be modelled as a moving source along the northern part of the eastern edge of the key area for potential CMP development. Sediment load would be distributed in the corresponding model grid cell. For backfilling in the northernmost CMP, it is assumed each barge will be loaded with 800 m3 of sedi...
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