Impact of COVID-19 on Port Production and Operation Based on System Dynamics: A Case Study of Shanghai Port in China

Table 3

Determination of the initial value of the model.

Parameter	Initial value	Units	Data source
Real GDP	6763	Hundred million RMB	Calculated by nominal GDP and GDP Index
Port throughput	72758	Ten thousand tons	2019 Shanghai Statistical Yearbook
Domestic trade cargo throughput	38980	Ten thousand tons	2019 Shanghai Statistical Yearbook
Foreign trade cargo throughput	33778	Ten thousand tons	2019 Shanghai Statistical Yearbook
Passenger transportation	13519	Ten thousand people	2019 Shanghai Statistical Yearbook
Port throughput capacity	4.6	Hundred million tons	2011 China Port Yearbook
Cargo transportation	93318	Ten thousand tons	2019 Shanghai Statistical Yearbook