## 4 Case Study  
The Yangtze River is the highest river in the Changjiang New Town section. During the flood season, the water level of the Yangtze River is often higher than that of Wuhu Lake. When the Binjiang area in the Changjiang New Town is developed, attention should be paid to the protection of shoreline tidal wetlands. The ecological buffer zone should be  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline  & \(\mathbf{I}(\mathbf{B}\mathbf{1}\mathbf{C}_{i})\) & \(\mathbf{I}(\mathbf{B}\mathbf{1}\mathbf{C}-\mathbf{C}_{i})\) & _New Sig(\(\mathbf{C}_{i}\))_ & _W(\(\mathbf{C}_{i}\))_ \\ \hline \(C_{1}\) & 0.10 & 0.02 & 0.02 & 0.316 \\ \(C_{2}\) & 0.12 & 0.02 & 0.02 & 0.368 \\ \(C_{3}\) & 0.12 & 0 & 0 & 0.316 \\ \(C_{4}\) & 0.10 & 0.20 & 0.825 & 0.578 \\ \(C_{5}\) & 0.20 & 0.10 & 0.475 & 0.422 \\ \(C_{8}\) & 0.10 & 0.02 & 0.02 & 0.333 \\ \(C_{9}\) & 0.10 & 0.06 & 0.06 & 0.444 \\ \(C_{10}\) & 0.08 & 0 & 0 & 0.223 \\ \hline \hline \end{tabular}
\end{table}
Table 6: Condition entropy, importance degree and attribute weight of index layer.  
Figure 4: Fuzzy comprehensive evaluation membership function.  
set up within a certain range of river edge to avoid digging river sand, building artificial islands and large underground buildings, etc., because these will strongly change the hydraulic conditions and have a negative effect on the internal security of Changjiang New Town. Therefore, a restricted development zone should be set up within a certain range along the river.  
On the basis of collecting various data, this paper imports the screened and pre-processed data into the geographic database. According to the established index system and evaluation methods, the properties of each zoning unit are evaluated, classified, superimposed and calculated, and finally the evaluation results of the suitability zoning of underground space in the starting area of Wuhan Changjiang New Town are generated, as shown in Figure 5. The summary table of the evaluation results is shown in Table 7.  
Combined with the suitability zoning map and the evaluation summary table, it can be known that:  
1. On the whole, the suitability of underground space development and utilization in the starting area of Wuhan Changjiang New Town is good. The evaluation results mainly include excellent suitability (class I) and good suitability (class II), and the proportion of medium suitability (class III) is small. According to the evaluation criteria and methods in this paper, there are no areas with poor suitability or very poor suitability in the starting area of Changjiang New Town.
2. In the starting area, most of the areas north of the Sheshui River have better geotechnical conditions and geomorphological conditions, but the water content in this area  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Class** & **I** & **II** & **III** & **Water Area** & **Restricted Area** \\ \hline Area/km\({}^{2}\) & 34.42 & 21.80 & 7.34 & 6.69 & 1.4 \\ Percentage/\% & 48.04 & 30.43 & 10.24 & 9.34 & 1.95 \\ \hline \hline \end{tabular}
\end{table}
Table 7: Summary of suitability evaluation results of underground space.  
Figure 5: Evaluation results of UUS suitability in the starting area of Wuhan Changjiang New Town.  
is abundant, and single well yield can be up to 467.467-666.399 m\({}^{3}\)/d. Therefore, during the development and utilization of this area, the main restriction condition is groundwater.
3. The areas with relatively poor suitability are mainly concentrated in the southwest side of the starting area. The hydrogeological conditions in this area are complex, and there is the phenomenon of soft soil surface subsidence and karst ground collapse medium development. The development and utilization of underground space is relatively unfavorable.