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https://doi.org/10.5194/nhess-2019-131
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-131
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 28 May 2019

Submitted as: research article | 28 May 2019

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This preprint has been withdrawn by the authors.

Initial Assessment of Landslide Prone Area using Soil Properties

Yanto, Arwan Apriyono, Purwanto Bekti Santoso, and Sumiyanto Yanto et al.
  • Civil Engineering Department, Jenderal Soedirman University, Purbalingga, 53371, Indonesia

Abstract. Initial assessment of landslide prone area is important in designing landslide mitigation measures. This study, a part of our study on developing landslide spatial model, presents initial signal of landslide prone area. In here, we use soil depth to hardpan to assess landslide prone area in Western Central Java, a relatively small region where 23 % of Indonesian landslide occurs. To this end, we interpolated soil depth to hardpan in a regular grid from irregularly distributed data. To do this, we employed three different methods: Inverse Distance Weighting (IDW), Ordinary Kriging (OK) and Co-Kriging (CK). For the latter, we experimented with several potential covariates. To determine the best fitting model, several tests on model performance and its corresponding errors were done. Error measures used in this study are Mean Square Error (MSE), Root Mean Square Error (RMSE), Mean Absolute Error (MAE) and Mean Absolute Percentage Error (MAPE), while statistical measures employed are Standard Deviation, Variance, Interquartile Range (IQR), Mean Absolute Deviation and Median Absolute Deviation. The result shows that CK with covariate of slope and soil cohesion is the best fitting model and exhibits clear pattern related to recorded landslide disaster sites. We found that 64 % of landslide disaster events occur in the area having soil depth to hardpan of 5–10 m. Moreover, 84 % of landslide occurrences happen in regions where soil depth to hardpan ranges from 5 to 15 m. Hence, we suggest that landslide prone area is an area possessing soil depth to hardpan of 5–15 m. This finding is advantageous for policy makers in planning and designing efforts for landslide mitigation.

This preprint has been withdrawn.

Yanto et al.

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Yanto et al.

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Short summary
Landslide occurs when the safety factor (SF), defined as ratio of shear strength and acting force less than 1. Those parameters are influenced by soil properties. We found that many civil laboratories have this information. We are curious if we can identify landslide prone area using soil properties. This study is initial phase of our entire study to develop translational landslide model which will be useful to map landslide prone area based on on its safety factor.
Landslide occurs when the safety factor (SF), defined as ratio of shear strength and acting...
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