## 4 Result
### Correlation between Water-Level Fluctuations and the Reactivation  
Due to the varying rates of water level, the displacement of landslides varies accordingly. Therefore, the analysis of the correlation between reservoir water level fluctuations and cumulative displacement is divided into three stages based on the trend of reservoir water level changes: descending, fluctuating, and ascending, as shown in Table 4.  
A quantitative analysis of the correlation between landslide displacement and reservoir water level was conducted using data from 2019 to 2020, resulting in Table 5.  
The correlation coefficients \(r\) of deformation monitoring points CYP-GTP-01, CYP-GTP-02, and CYP-GTP-03 on the landslide exhibit a certain level of consistency for the same months. During periods of fluctuating water levels, the deformation of the landslide progresses slowly. However, during decreasing reservoir water levels, as the correlation coefficient \(|r|\) increases, the extent of the landslide's deformation in response to changes in the reservoir water level also increases. However, during each period of decreasing reservoir water levels, there is a discrepancy between one monitoring point and the other two. Analysis suggests that this discrepancy is due to a certain degree of missing data in the monitoring points and reservoir water level data, leading to some calculation errors. During the descending stage, except for individual points, the correlation coefficients between the deformation of various points on the landslide and the reservoir water level can range from \(-0.8977\) to \(-0.5056\), generally around \(-0.75\). This indicates a positive correlation and moderate correlation between \begin{table}
\begin{tabular}{c c c} \hline \hline
**Stages (Reservoir Water Level)** & **Time** & **Change in Reservoir Water Level (m)** \\ \hline Fluctuating & 25 April 2019–30 May 2019 & 1617–1615 \\ Descending & 2 June 2019–19 June 2019 & 1614–1589 \\ Ascending & 19 June 2019–18 July 2019 & 1589–1618 \\ Fluctuating & 19 July 2019–13 August 2019 & 1618 \\ Descending & 14 August 2019–30 August 2019 & 1617–1598 \\ Ascending & 31 August 2019–28 September 2019 & 1598–1618 \\ Fluctuating & 29 September 2019–16 January 2020 & 1618–1610 \\ Ascending & 17 January 2020–29 February 2020 & 1610–1616 \\ Descending & 1 March 2020–15 April 2020 & 1616–1586 \\ Ascending & 17 April 2020–29 June 2020 & 1586–1617 \\ Fluctuating & 30 June 2020–28 August 2020 & 1617–1618 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Reservoir water level change stages. \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & & \multicolumn{3}{c}{**Pearson Correlation Coefficients**} \\  & & \multicolumn{3}{c}{**between Landslide Cumulative**} \\
**Scheme** & **Time** & \multicolumn{3}{c}{**Displacement and Reservoir Water Level \(r\)**} \\ \cline{3-5}  & & **CYP-GTP-01** & **CYP-GTP-02** & **CYP-GTP-03** \\ \hline Fluctuating & 25 April 2019–30 May 2019 & 0.0289 & \(-0.02736\) & \(-0.0480\) \\ Descending & 2 June 2019–19 June 2019 & \(-0.7185\) & \(-0.5056\) & \(0.0574\) \\ Ascending & 19 June 2019–18 July 2019 & \(-0.0614\) & \(-0.2178\) & \(-0.3409\) \\ Fluctuating & 19 July 2019–13 August 2019 & 0.0320 & 0.0616 & \(0.2167\) \\ Descending & 14 August 2019–30 August 2019 & \(-0.1932\) & \(-0.7105\) & \(-0.6748\) \\ Ascending & 31 August 2019–28 September 2019 & 0.2430 & \(-0.0899\) & \(0.0433\) \\ Fluctuating & 29 September 2019–16 January 2020 & 0.03529 & \(-0.06132\) & \(0.0386\) \\ Ascending & 17 January 2020–29 February 2020 & 0.1039 & \(-0.1146\) & \(0.0318\) \\ Descending & 1 March 2020–15 April 2020 & \(-0.7891\) & \(0.2331\) & \(-0.8977\) \\ Ascending & 17 April 2020–29 June 2020 & 0.0567 & 0.1740 & \(0.2039\) \\ Fluctuating & 30 June 2020–28 August 2020 & 0.1524 & 0.1410 & \(-0.2441\) \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Summary of Pearson correlation coefficients between cumulative landslide displacements and water levels. the deformation of the landslide and the rapid decrease in reservoir water level.