Is the Spatial-Temporal Dependence Model Reliable for the Short-Term Freight Volume Forecast of Inland Ports? A Case Study of the Yangtze River, China
Abstract
:1. Introduction
2. Related Work
2.1. Analysis of Port Freight Volume Relationships
2.2. Forecasting Methods for Freight Volume
2.3. Motivation
3. Data and Methods
3.1. Ports and Data
3.1.1. Port Locations and Freight Volume Data
3.1.2. Trend Analysis and Stationary Detection
3.2. The Framework for Spatial-Temporal Dependence Forecasting and Analysis
3.2.1. Correlation Analysis of Freight Volume Data
3.2.2. Autocorrelation Analysis
3.2.3. Cross-Correlation Analysis
3.2.4. Spatial-Temporal Dependence Forecasting Model for Port Freight Volumes
3.2.5. GBDT Forecasting Process
- We calculated the average of as the initial learner ;
- We calculated the residuals , where is the lost function, and is the training data;
- We built a tree with a goal of predicting the residuals, which takes as the training data of the new tree;
- We calculated the best-fitting value for leaf node area , where is the number of leaf nodes of the tree;
- We updated with ;
- We repeated step 2 to step 4 until the number of iterations matches the number specified by the hyperparameter;
- We used the last to make a final prediction as to the value of the freight volume of the target port.
3.2.6. The Single-Stage GBDT Forecasting Model
3.3. Time Series Forecasting Models of Port Freight Volumes
3.3.1. Auto-Regression Integrated Moving Average
3.3.2. Support Vector Regression
- (a)
- data standardization to prevent local features from being too large or too small, and to speed up the calculation;
- (b)
- the determination of the kernel function and the parameters , and the construction of the SVR model;
- (c)
- training of the SVR model based on training data;
- (d)
- the prediction of the target value after obtaining the model.
3.3.3. Back-Propagation Neural Network
3.3.4. Evaluation Methods for Forecasting Results
3.4. Experimental Design
3.4.1. Dataset Partitioning
3.4.2. Parameter Selection
4. Results
4.1. Correlation Analysis of Port Freight Volume
4.1.1. Autocorrelation Analysis of Port Freight Volume
- (a)
- There was no obvious periodic pattern in the time series of weekly freight volume;
- (b)
- With the increase of the time interval between the current week and the previous week, the correlation decreased gradually;
- (c)
- The weeks with higher correlation are the antecedent 1–3 weeks, but there is both positive and negative autocorrelation.
4.1.2. Freight Volume Correlation Analysis between Ports
4.1.3. Was There a Lag between the Weekly Freight Volumes of Different Ports?
4.1.4. Is the Correlation of Ports’ Weekly Freight Volume Dynamic?
4.1.5. Is the Correlation of Ports’ Weekly Freight Volume Related to Ports’ Grades?
4.2. Prediction Comparison between Different Forecasting Models
4.2.1. Comparison between Spatial-Temporal Dependence Forecasting and Time Series Forecasting
4.2.2. Comparison between Static Spatial Dependence and Dynamic Spatial Dependence
4.2.3. Comparison between Time Series with and without Stationary Processing
5. Discussion
6. Conclusions
- The weekly freight volume of an inland port is higher depending on its past data.
- The spatial-temporal dependence model is not sensitive enough to offer a major improvement in the forecasting of the weekly freight volume forecasting for inland river ports, although it does offer a minor improvement.
- Dynamic freight volume correlation and stationary processing help to make predictions more accurate.
- The weekly freight volume forecasts of different ports show obvious differences.
- In order to make more accurate predictions, for the benefit of port management departments, these freight volume forecasting models and results should be taken into account when carrying out related research.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Port | Province/ City | Distance from Wuhan Port (km) | Average Freight Volume per Week (t) | Average Freight Volume per Year (t) | Rank |
---|---|---|---|---|---|
Chongqing Port | Chongqing | 1286 | 743,147.4 | 31,168,095.0 | 5 |
Yichang Port | Hubei | 626 | 231,196.2 | 9,781,418.3 | 9 |
Shashi Port | Hubei | 478 | 87,369.9 | 5,681,884.9 | 10 |
Chenglingji Port | Hunan | 231 | 1,290,178.1 | 57,570,284.1 | 2 |
Wuhan Port | Hubei | 0.0 | 1,194,259.3 | 57,803,446.1 | 1 |
Huangshi Port | Hubei | 133 | 240,774.6 | 9,994,258.5 | 8 |
Fuchi Port | Hubei | 195 | 55,721.4 | 988,158.1 | 12 |
Wuxue Port | Hubei | 204 | 132,642.0 | 3,566,179.7 | 11 |
Jiujiang Port | Jiangxi | 250 | 269,118.6 | 13,426,721.4 | 6 |
Hukou Port | Jiangxi | 260 | 264,441.0 | 12,746,637.7 | 7 |
Tongling Port | Anhui | 496 | 878,022.6 | 45,468,097.5 | 3 |
Wuhu Port | Anhui | 600 | 691,657.1 | 38,161,639.8 | 4 |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | 1 | 0.572 | 0.293 | 0.157 | 0.353 | 0.464 | 0.173 | 0.457 | 0.321 | 0.173 | 0.094 | 0.425 |
2 | 0.572 | 1 | 0.266 | 0.367 | 0.432 | 0.347 | 0.164 | 0.615 | 0.219 | 0.237 | 0.169 | 0.356 |
3 | 0.293 | 0.266 | 1 | 0.139 | 0.164 | 0.219 | 0.221 | 0.139 | 0.079 | 0.068 | 0.152 | 0.230 |
4 | 0.157 | 0.367 | 0.139 | 1 | 0.308 | 0.141 | 0.203 | 0.148 | 0.040 | 0.0490 | 0.227 | 0.370 |
5 | 0.3523 | 0.432 | 0.164 | 0.308 | 1 | 0.392 | 0.095 | 0.271 | 0.160 | 0.254 | 0.390 | 0.473 |
6 | 0.464 | 0.347 | 0.219 | 0.141 | 0.392 | 1 | 0.185 | 0.280 | 0.221 | 0.265 | 0.237 | 0.384 |
7 | 0.173 | 0.164 | 0.221 | 0.203 | 0.095 | 0.185 | 1 | 0.130 | −0.108 | 0.270 | 0.190 | 0.113 |
8 | 0.457 | 0.615 | 0.139 | 0.148 | 0.271 | 0.280 | 0.130 | 1 | 0.360 | 0.345 | 0.092 | 0.262 |
9 | 0.321 | 0.219 | 0.079 | 0.040 | 0.160 | 0.220 | −0.108 | 0.360 | 1 | 0.114 | 0.060 | 0.175 |
10 | 0.173 | 0.237 | 0.068 | 0.0490 | 0.254 | 0.265 | 0.269 | 0.345 | 0.114 | 1 | 0.160 | 0.201 |
11 | 0.094 | 0.169 | 0.152 | 0.227 | 0.390 | 0.237 | 0.190 | 0.092 | 0.060 | 0.160 | 1 | 0.402 |
12 | 0.425 | 0.356 | 0.230 | 0.370 | 0.473 | 0.384 | 0.113 | 0.262 | 0.175 | 0.201 | 0.402 | 1 |
Ports | Models and Hyper-Parameters | ||||||||
---|---|---|---|---|---|---|---|---|---|
ARIMA | SVR | BPNN | GBDT | ||||||
Kernel | Activation | Number of Neurons | Estimators | Learning Rate | Max Depth | ||||
Chenglingli | 2 | 0 | 8.01 | linear | relu | 7 | 97 | 0.0266 | 18 |
Chongqing | 3 | 3 | 8.53 | poly | relu | 10 | 103 | 0.0012 | 21 |
Fuchi | 0 | 1 | 5.43 | rbf | tanh | 5 | 95 | 0.0018 | 20 |
Huangshi | 0 | 1 | 6.96 | linear | tanh | 9 | 97 | 0.0567 | 19 |
Hukou | 0 | 1 | 7.52 | linear | relu | 9 | 99 | 0.0777 | 20 |
Jiujiang | 1 | 0 | 12.28 | linear | identity | 8 | 103 | 0.0216 | 23 |
Shashi | 0 | 2 | 5.06 | rbf | relu | 8 | 93 | 0.0315 | 22 |
Tongling | 2 | 1 | 10.05 | linear | relu | 9 | 100 | 0.1166 | 21 |
Wuhan | 2 | 0 | 9.2 | rbf | tanh | 9 | 99 | 0.1235 | 22 |
Wuhu | 2 | 0 | 6.63 | linear | tanh | 7 | 98 | 0.1042 | 22 |
Wuxue | 1 | 0 | 9.33 | linear | relu | 10 | 98 | 0.1672 | 20 |
Yichang | 2 | 2 | 9.81 | poly | relu | 8 | 97 | 0.05378 | 18 |
Ports | Models | ||||
---|---|---|---|---|---|
Chongqing Port | SVR-GBDT | 0.6142 | 0.7645 | 114814 | 17.5140 |
STSVT | 0.6354 | 0.7793 | 109594 | 17.2641 | |
SVR | 0.6271 | 0.7549 | 111383 | 17.1492 | |
Yichang Port | SVR-GBDT | 0.6318 | 0.7860 | 46907.8 | 23.0705 |
STSVT | 0.7110 | 0.8323 | 37346.2 | 18.8978 | |
SVR | 0.6131 | 0.7723 | 39594.2 | 18.6422 | |
Shashi Port | SVR-GBDT | 0.6629 | 0.7979 | 27866.8 | 71.2912 |
STSVT | 0.7717 | 0.8652 | 20955.1 | 62.7795 | |
SVR | 0.7619 | 0.8609 | 21156 | 52.5459 | |
Chenglingji Port | SVR-GBDT | 0.4909 | 0.6913 | 388887 | 43.795 |
STSVT | 0.6209 | 0.7776 | 295815 | 35.539 | |
SVR | 0.6197 | 0.7759 | 274525 | 30.2371 | |
Wuhan Port | SVR-GBDT | 0.3544 | 0.6002 | 150934 | 14.3819 |
STSVT | 0.4212 | 0.6399 | 112476 | 11.1286 | |
SVR | 0.4685 | 0.6852 | 114343 | 10.6734 | |
Huangshi Port | SVR-GBDT | 0.4383 | 0.6420 | 62257.2 | 20.0887 |
STSVT | 0.5985 | 0.7533 | 45119.9 | 20.1444 | |
SVR | 0.5276 | 0.7141 | 45383 | 21.4577 | |
Fuchi Port | SVR-GBDT | 0.8013 | 0.8817 | 23504.5 | 124.399 |
STSVT | 0.7941 | 0.8727 | 24230.3 | 335.966 | |
SVR | 0.7912 | 0.8724 | 22878.8 | 268.399 | |
Wuxue Port | SVR-GBDT | 0.6732 | 0.7971 | 43535.6 | 44.4348 |
STSVT | 0.7878 | 0.8699 | 29921.2 | 29.4547 | |
SVR | 0.7589 | 0.8534 | 30449 | 32.8891 | |
Jiujiang Port | SVR-GBDT | 0.2311 | 0.5185 | 69281.1 | 28.7139 |
STSVT | 0.3651 | 0.6139 | 49234.8 | 20.9561 | |
SVR | 0.3922 | 0.6107 | 52461.3 | 22.0805 | |
Hukou Port | SVR-GBDT | 0.4671 | 0.6751 | 62505.6 | 25.4328 |
STSVT | 0.6364 | 0.7829 | 43338.2 | 18.0239 | |
SVR | 0.6780 | 0.8084 | 40370 | 16.5361 | |
Tongling Port | SVR-GBDT | 0.1231 | 0.4481 | 220966 | 30.5405 |
STSVT | 0.2423 | 0.5294 | 156148 | 24.1003 | |
SVR | 0.3308 | 0.5934 | 137192 | 20.0258 | |
Wuhu Port | SVR-GBDT | 0.6333 | 0.7758 | 143389 | 23.1780 |
STSVT | 0.6627 | 0.7838 | 126290 | 20.5344 | |
SVR | 0.7797 | 0.8729 | 97741.1 | 15.9640 |
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Liu, L.; Zhang, Y.; Chen, C.; Hu, Y.; Liu, C.; Chen, J. Is the Spatial-Temporal Dependence Model Reliable for the Short-Term Freight Volume Forecast of Inland Ports? A Case Study of the Yangtze River, China. J. Mar. Sci. Eng. 2021, 9, 985. https://doi.org/10.3390/jmse9090985
Liu L, Zhang Y, Chen C, Hu Y, Liu C, Chen J. Is the Spatial-Temporal Dependence Model Reliable for the Short-Term Freight Volume Forecast of Inland Ports? A Case Study of the Yangtze River, China. Journal of Marine Science and Engineering. 2021; 9(9):985. https://doi.org/10.3390/jmse9090985
Chicago/Turabian StyleLiu, Lei, Yong Zhang, Chen Chen, Yue Hu, Cong Liu, and Jing Chen. 2021. "Is the Spatial-Temporal Dependence Model Reliable for the Short-Term Freight Volume Forecast of Inland Ports? A Case Study of the Yangtze River, China" Journal of Marine Science and Engineering 9, no. 9: 985. https://doi.org/10.3390/jmse9090985