Abstract
The purpose of the current study is to produce landslide susceptibility maps using different probabilistic and bivariate statistical approaches; namely, frequency ratio (FR), weights-of-evidence (WofE), index-of-entropy (IofE), and Dempster–Shafer (DS) models, at Wadi Itwad, Asir region, in the southwestern part of Saudi Arabia. Landslide locations were identified and mapped from interpretation of high-resolution satellite images, historical records, and extensive field surveys. In total, 326 landslide locations were mapped using ArcGIS and divided into two groups; 75 % and 25 % of landslide locations were used for training and validation of models, respectively. Twelve layers of landslide-related factors were prepared, including altitude, slope degree, slope length, topography wetness index, curvature, slope aspect, distance from lineaments, distance from roads, distance from streams, lithology, rainfall, and normalized difference vegetation index. The relationships between the landslide-related factors and the landslide inventory map were calculated using different statistical models (FR, WofE, IofE, and DS). The model results were verified with landslide locations, which were not used during the model training. In addition, receiver operating characteristic curves were applied, and area under the curve (AUC) was calculated for the different susceptibility maps using the success (training data) and prediction (validation data) rate curves. The results showed that the AUC for success rates are 0.813, 0.815, 0.800, and 0.777, while the prediction rates are 0.95, 0.952, 0.946, and 0.934 for FR, WofE, IofE, and DS models, respectively. Subsequently, landslide susceptibility maps were divided into five susceptibility classes, including very low, low, moderate, high, and very high. Additionally, the percentage of training and validating landslides locations in high and very high landslide susceptibility classes in each map were calculated. The results revealed that the FR, WofE, IofE, and DS models produced reasonable accuracy. The outcomes will be useful for future general planned development activities and environmental protection.
This is a preview of subscription content, access via your institution.












References
Abdi E, Majnounian B, Genet M, Rahimi H (2010) Quantifying the effects of root reinforcement of Persian Ironwood (Parrotia Persica) on slope stability; a case study: Hill slope of Hyrcanian forests, northern Iran. Ecol Eng 36(10):1409–1416
Akgun A, Sezer EA, Nefeslioglu HA, Gokceoglu C, Pradhan B (2012) An easy-to use MATLAB program (MamLand) for the assessment of landslide susceptibility using a Mamdani fuzzy algorithm. Comput Geosci 38(1):23–34
Althuwaynee OF, Pradhan B, Lee S (2012) Application of an evidential belief function model in landslide susceptibility mapping. Comput Geosci 44:120–135
Avtar R, Singh CK, Singh G, Verma RL, Mukherjee S, Sawada H (2011) Landslide susceptibility zonation study using remote sensing and GIS technology in the Ken-Betwa River Link area, India. Bull Eng Geol Environ 70(4):595–606
Ayalew L, Yamagishi H (2004) Slope movements in the Blue Nile basin, as seen from landscape evolution perspective. Geomorphology 57:95–116
Ayalew L, Yamagishi H (2005) The Application of GIS–based logistic regression for landslide susceptibility mapping in the Kakuda-Yahiko Mountains, central Japan. Geomorphology 65:15–31
Bai S, Lu G, Wang J, Zhou P, Ding L (2010) GIS-based rare events logistic regression for landslide-susceptibility mapping of Lianyungang, China. Environ Earth Sci 62(1):139–149
Bednarik M, Yilmaz I, Marschalko M (2012) Landslide hazard and risk assessment: a case study from the Hlohovec-Sered landslide -area in southwest Slovakia. Nat Hazards. doi:10.1007/s11069-012-0257-7
Bell FG (1998) Environmental geology: principles and practice. Wiley, NY
Binaghi E, Luzi L, Madella P, Pergalani F, Rampini A (2008) Slope instability zonation: a comparison between certainty factor and Fuzzy Dempster-Shafer approaches. Nat Hazards 17:77–97
Blais-Stevens A, Behnia P, Kremer M, Page A, Kung R, Bonham-Carter G (2012) Landslide susceptibility mapping of the Sea to Sky transportation corridor, British Columbia, Canada: comparison of two methods. Bull Eng Geol Environ 71(3):447–466
Böhner J, Selige T (2006) Spatial prediction of soil attributes using terrain analysis and climate regionalization In: Böhner J, McCloy KR, Strobl J (eds) SAGA—analysis and modelling applications, Goettinger Geographische Abhandlungen 115: 13–27
Böhner J, McCloy KR, Strobl J (2006) SAGA—analysis and modelling applications. Göttinger Geographische Abhandlungen 115:130
Bui DT, Lofman O, Revhaug I, Dick O (2011a) Landslide susceptibility analysis in the Hoa Binh province of Vietnam using statistical index and logistic regression. Nat Hazards. doi:10.1007/s11069-011-9844-2
Bui DT, Pradhan B, Lofman O, Revhaung I, Dick OB (2011b) Landslide susceptibility mapping at Hoa Binh province (Vietnam) using an adaptive neuro-fuzzy inference system and GIS. Comput Geosci. doi:10.1016/j.cageo.2011.10.031
Bui DT, Pradhan B, Lofman O, Revhaug I, Dick OB (2012) Landslide susceptibility assessment in the Hoa Binh Province of Vietnam: a comparison of the Levenberg-Marquardt and Bayesian regularized neural networks. Geomorphology. doi:10.1016/j.geomorph.2012.04.023
Cardinali M, Carrara A, Guzzetti F, Reichenbach P (2002) Landslide hazard map for the upper Tiber river basin. CNR Gruppo Nazionale per la Difesa dalle Catastrofi Idrogeologiche Publication n. 2116, scale 1:100000
Carranza EJM, Castro O (2006) Predicting lahar-inundation zones: case study inWestMount Pinatubo, Philippines. Nat Hazards 37:331–372
Carranza EJM, Hale M (2000) Geologically constrained probabilistic mapping of gold potential, Baguio district, Philippines. Nat Resour Res 9:237–253
Cevik E, Topal T (2003) GIS-based landslide susceptibility mapping for a problematic segment of the natural gas pipeline, Hendek (Turkey). Environ Geol 44:949–962
Chaabane SB, Sayadi M, Fnaiech F, Brassart E (2009) Dempster-Shafer evidence theory for image segmentation: application in cells images. World Academy of Science. Eng Technol 3:11–29
Chakraborty S, Pradhan R (2012) Development of GIS based Landslide Information System for the Region of East Sikkim. Int J Comput Appl (0975–8887) 49 (7)
Chauhan S, Sharma M, Arora MK, Gupta NK (2010) Landslide susceptibility zonation through ratings derived from artificial neural network. Int J Appl Earth Observ Geoinform 12:340–350
Cheng K, Wei C, Chang S (2004) Locating landslides using multi-temporal satellite images. Adv Space Res 33:296–301
Constantin M, Bednarik M, Jurchescu MC, Vlaicu M (2011) Landslide susceptibility assessment using the bivariate statistical analysis and the index of entropy in the Sibiciu Basin (Romania). Environ Earth Sci 63:397–406
Dahal RK, Hasegawa S, Nonomura A, Yamanaka M, Dhakal S, Paudyal P (2008a) Predictive modeling of rainfall-induced landslide hazard in the Lesser Himalaya of Nepal based on weights-of evidence. Geomorphology 102(3–4):496–510
Dahal RK, Hasegawa S, Nonomura A, Yamanaka M, Masuda T, Nishino K (2008b) GIS-based weights-of-evidence modeling of rainfall-induced landslides in small catchments for landslide susceptibility mapping. Environ Geol 54(2):314–324
Dai FC, Lee CF, Xu ZW (2001) Assessment of landslide susceptibility on the natural terrain of Lantau Island, Hong Kong. Environ Geol 40(3):381–391
Daneshfar B, Benn K (2002) Spatial relationships between natural seismicity and faults, southeastern Ontario and north-central New York State. Tectonophysics 353:31–44
De La Ville N, Diaz AC, Ramirez D (2002) Remote sensing and GIS technologies as tools to support sustainable management of areas devastated by landslides. Environ develop sustainability 4(2):221–229
Dempster AP (1967) Upper and lower probabilities induced by a multi valued mapping. The Annals Math Stat 28:325–339
Devkota KC, Regmi AD, Pourghasemi HR, Yoshida K, Pradhan B, Ryu IC, Dhital MR, Althuwaynee OF (2013) Landslide susceptibility mapping using certainty factor, index of entropy and logistic regression models in GIS and their comparison at Mugling-Narayanghat road section in Nepal Himalaya. Nat Hazards 65(1):135–165
Duman T, Çan T, Emre Ö, Keçer M, Doğan A, Ateş Ş, Durmaz S (2005) Landslide inventory of southwestern Anatolia, Turkey. Eng Geol 77:99–114
Fernandes NF, Guimaraes RF, Gomes RAT, Vieira BC, Montgomery DR, Greenberg H (2004) Topographic controls of landslides in Rio de Janeiro: field evidence and modelling. Catena 55:163–181
Gokceoglu C, Aksoy H (1996) Landslide susceptibility mapping of the slopes in the residual soils of the Mengen region (Turkey) by deterministic stability analyses and image processing techniques. Eng Geol 44:147–161
Guzzetti F, Carrara A, Cardinali M, Reichenbach P (1999) Landslide hazard evaluation: a review of current techniques and their application in a multi-scale study, Central Italy. Geomorphology 31:181–216
Hart AB, Hearn GJ (2013) Landslide assessment for land use planning and infrastructure management in the Paphos District of Cyprus. Bull Eng Geol Environ 72(2):173–188
He YP, Xie H, Cui P, Wei FQ, Zhong DL, Gardner JS (2003) GIS-based hazard mapping and zonation of debris flows in Xiaojiang Basin, southwestern China. Environ Geol 45:286–293
Jaafari A, Najafi A, Pourghasemi HR, Rezaeian J, Sattarian A (2014) GIS-based frequency ratio and index of entropy models for landslide susceptibility assessment in the Caspian forest, northern Iran. Int J Environ Sci Technol 11(4):909–926
Jiménez-Perálvarez JD, Irigaray C, Hamdouni RE, Chacón J (2011) Landslide-susceptibility mapping in a semi-arid mountain environment: an example from the southern slopes of Sierra Nevada (Granada, Spain). Bull Eng Geol Environ 70(2):265–277
Khanh NQ (2009) Landslide hazard assessment in muonglay, Vietnam applying GIS and remote sensing. Dissertation, faculty of mathematics and natural sciences Ernst-Moritz- Arndt- University Greifswald
Lee S, Evangelista DG (2006) Earthquake-induced landslide-susceptibility mapping using an artificial neural network. Nat Hazards Earth Syst Sci 6:687–695
Lee S, Min K (2001) Statistical analysis of landslide susceptibility at Yongin, Korea. Environ Geol 40:1095–1113
Lee S, Pradhan B (2006) Probabilistic landslide risk mapping at Penang Island, Malaysia. J Earth Syst Sci 115(6):661–672
Lee S, Pradhan B (2007) Landslide hazard mapping at Selangor, Malaysia using frequency ratio and logistic regression models. Landslides 4:33–41
Lee S, Choi J, Min K (2004) Probabilistic landslide hazard mapping using GIS and remote sensing data at Boun, Korea. Int J Remote Sens 25:2037–2052
Lei TC, Wan T, Chou TY (2011) The knowledge expression on debris flow potential analysis through PCA + LDA and rough sets theory: a case study of Chen-Yu-Lan watershed, Nantou, Taiwan. Environ Earth Sci 63(5):981–997
Maerz NH, Youssef AM, Pradhan B, Bulkhi A (2014) Remediation and mitigation strategies for rock fall hazards along the highways of Fayfa Mountain, Jazan Region, Kingdom of Saudi. Arab J Geosci. doi:10.1007/s12517-014-1423-x
Mohammady M, Pourghasemi HR, Pradhan B (2012) Landslide susceptibility mapping at Golestan Province Iran: a comparison between frequency ratio, Dempster-Shafer, and weights-of evidence models. J Asian Earth Sci 61:221–236
Moore ID, Grayson RB (1991) Terrain-based catchment partitioning and runoff prediction using vector elevation data. Water Resour Res 27(6):1171–1191
Moreiras SM (2005) Landslide susceptibility zonation in Rio Mendoza Valley, Argentina. Geomorphology 66:345–357
Nefeslioglu HA, Duman TY, Durmaz S (2008) Landslide susceptibility mapping for a part of tectonic Kelkit Valley (Eastern Black Sea region of Turkey). Geomorphol 94:401–418
Nefeslioglu HA, Sezer E, Gokceoglu C, Bozkir AS, Duman TY (2010) Assessment of landslide susceptibility by decision trees in the Metropolitan area of Istanbul. Math Problems in Eng, Turkey. doi:10.1155/2010/901095 (Article ID 901095)
Oh HJ, Lee S (2011) Cross-application used to validate landslide susceptibility maps using a probabilistic model from Korea. Environ Earth Sci 64(2):395–409
Oh HJ, Pradhan B (2011) Application of a neuro-fuzzy model to landslidesusceptibility mapping for shallow landslides in a tropical hilly area. Comput Geosci 37:1264–1276
Ozdemir A, Altural T (2013) A comparative study of frequency ratio, weights of evidence and logistic regression methods for landslide susceptibility mapping: sultan Mountains, SW Turkey. J Asian Earth Sci 64:180–197
Oztekin B, Topal T (2005) GIS-based detachment susceptibility analyses of a cut slope in limestone, Ankara-Turkey. Environ Geol 49:124–132
Pachauri AK, Pant M (1992) Landslide hazard mapping based on geological attributes. Eng Geol 32:81–100
Park NW (2011) Application of Dempster-Shafer theory of evidence to GIS-based landslide susceptibility analysis. Environ Earth Sci 62:367–376
Petley DN (2008) The global occurrence of fatal landslides in 2007. Geophysical Research Abstracts, vol 10, EGU general assembly 2008. p 3
Polykretis C, Ferentinou M, Chalkias CA (2014) Comparative study of landslide susceptibility mapping using landslide susceptibility index and artificial neural networks in the Krios River and Krathis River catchments (northern Peloponnesus, Greece). Bull Eng Geol Environ 74(1):27–45
Pourghasemi HR, Pradhan B, Gokceoglu C (2012a) Application of fuzzy logic and analytical hierarchy process (AHP) to landslide susceptibility mapping at Haraz watershed. Iran. Nat Hazards 63(2):965–996
Pourghasemi HR, Pradhan B, Gokceoglu C, Deylami Moezzi K (2012b) A comparative assessment of prediction capabilities of Dempster-Shafer and weights-of-evidence models in landslide susceptibility mapping using GIS. Geomat Nat Hazards Risk. doi:10.1080/19475705.2012.662915
Pourghasemi HR, Mohammady M, Pradhan B (2012c) Landslide susceptibility mapping using index of entropy and conditional probability models in GIS: Safarood Basin, Iran. Catena 97:71–84
Pourghasemi HR, Pradhan B, Gokceoglu C (2012d) Remote sensing data derived parameters and its use in landslide susceptibility assessment using Shannon’s entropy and GIS, AEROTECH IV–2012. Appl Mech Mater 225:486–491. doi:10.4028/www.scientific.net/AMM.225.486
Pourghasemi HR, Moradi HR, Fatemi Aghda SM (2013a) Landslide susceptibility mapping by binary logistic regression, analytical hierarchy process, and statistical index models and assessment of their performances. Nat Hazards 69:749–779
Pourghasemi HR, Pradhan B, Gokceoglu C, Mohammadi M, Moradi HR (2013b) Application of weights-of-evidence and certainty factor models and their comparison in landslide susceptibility mapping at Haraz watershed. Iran. Arab J Geosci 6(7):2351–2365
Pourghasemi HR, Moradi HR, Fatemi Aghda SM, Gokceoglu C, Pradhan B (2014) GIS-based landslide susceptibility mapping with probabilistic likelihood ratio and spatial multi-criteria evaluation models (North of Tehran, Iran). Arab J Geosci 7(5):1857–1878
Pourtaghi Z, Pourghasemi HR, Rossi M (2015) Forest fire susceptibility mapping in the Minudasht Forests, Golestan Province, Iran. Environ Earth Sci 73(4):1515–1533
Pradhan B (2010) Landslide susceptibility mapping of a catchment area using frequency ratio, fuzzy logic and multivariate logistic regression approaches. J Indian Society Remote Sens 38(2):301–320
Pradhan B (2011) Use of GIS-based fuzzy logic relations and its cross application to produce landslide susceptibility maps in three test areas in Malaysia. Environ Earth Sci 63(2):329–349
Pradhan B (2012) A comparative study on the predictive ability of the decision tree, support vector machine and neuro-fuzzy models in landslide susceptibility mapping using GIS. Comput Geosci. doi:10.1016/j.cageo.2012.08.023
Pradhan B, Pirasteh S (2010) Comparison between prediction capabilities of neural network and fuzzy logic techniques for landslide susceptibility mapping. Disaster Advances 3(2):26–34
Pradhan B, Youssef AM (2010) Manifestation of remote sensing data and GIS on landslide hazard analysis using spatial-based statistical models. Arab J Geosci 3(3):319–326
Pradhan B, Youssef AM, Varathrajoo R (2010) Approaches for delineating landslide hazard areas using different training sites in an advanced artificial neural network model. Geo-Spat Inform Sci 13(2):93–102
Pradhan B, Chaudhari A, Adinarayana J, Buchroithner MF (2012) Soil erosion assessment and its correlation with landslide events using remote sensing data and GIS: a case study at Penang Island. Malaysia. Environ Monit Assess 184(2):715–727
Regmi NR, Giardino JR, Vitek JD (2010) Modeling susceptibility to landslides using the weight of evidence approach: western Colorado, USA. Geomorphology 115:172–187
Regmi AD, Yoshida K, Pradhan B, Pourghasemi HR, Khumamoto T, Akgun A (2014a) Application of frequency ratio, statistical index and weights-of-evidence models, and their comparison in landslide susceptibility mapping in Central Nepal Himalaya. Arab J Geosci 7(2):725–742
Regmi AD, Yoshida K, Pourghasemi HR, Dhital MR, Pradhan B (2014b) Landslide susceptibility mapping along Bhalubang—Shiwapur area of mid-Western Nepal using frequency ratio and conditional probability models. J Mountain Sci 11(5):1266–1285
Saha AK, Gupta RP, Sarkar I, Arora MK, Csaplovics E (2005) An approach for GIS-based statistical landslide susceptibility zonation with a case study in the Himalayas. Landslides 2:61–69
Saponaro A, Pilz M, Wieland M, Bindi D, Moldobekov B, Parolai S (2014) Landslide susceptibility analysis in data-scarce regions: the case of Kyrgyzstan. DOI, Bull Eng Geol Environ. doi:10.1007/s10064-014-0709-2
Sezer EA, Pradhan B, Gokceoglu C (2011) Manifestation of an adaptive neuro-fuzzy model on landslide susceptibility mapping: klang valley, Malaysia. Expert Syst Appl 38:8208–8219
Shafer G (1976) A mathematical Theory of Evidence. Princeton Univ. Press, Priceton
Shannon CE (1948) A Mathematical Theory of Communication. Bell Syst Technol J 27:379–423
Sørensen R, Zinko U, Seibert J (2006) On the calculation of the topographic wetness index: evaluation of different methods based on field observations. Hydrol Earth Syst Sci 10:101–112
Swets JA (1988) Measuring the accuracy of diagnostic systems. Sci 270:1285–1293
Vahidnia MH, Alesheikh AA, Alimohammadi A, Hosseinali F (2010) A GIS-based neurofuzzy procedure for integrating knowledge and data in landslide susceptibility mapping. Comput & Geosci 36:1101–1114
van Westen CJ, van Asch TWJ, Soeters R (2006) Landslide hazard and risk zonation—why is it still so difficult? Bull Eng Geol Environ 65:167–184
World Meteorological Organization (1986) Manual for estimation of probable maximum precipitation. Operational hydrology, Report 1. WMO-No.332
Xu C (2013) Assessment of earthquake-triggered landslide susceptibility based on expert knowledge and information value methods: a case study of the 20 April 2013 Lushan, China Mw6.6 earthquake. Dis Adv 6(13):119–130
Xu C, Dai FC, Xu XW, Lee YH (2012a) GIS-based support vector machine modeling of earthquake-triggered landslide susceptibility in the Jianjiang River watershed, China. Geomorphology 145–146:70–80
Xu C, Xu XW, Dai FC, Saraf AK (2012b) Comparison of different models for susceptibility mapping of earthquake triggered landslides related with the 2008 Wenchuan earthquake in China. Comput Geosci 46:317–329
Yalcin A (2005) An investigation on Ardesen (Rize) region on the basis of landslide susceptibility, KTU, Ph.D. Thesis (in Turkish)
Yalcin A, Reis S, Aydinoglu AC, Yomralioglu T (2011) A GIS-based comparative study offrequency ratio, analytical hierarchy process, bivariate statistics and logistics regression methods for landslide susceptibility mapping in Trabzon, NE Turkey. Catena 85(3):274–287
Yeon YK, Han JG, Ryu KH (2010) Landslide susceptibility mapping in Injae, Korea, using a decision tree. Eng Geol 116:274–283
Yilmaz I (2009) A case study from Koyulhisar (Sivas-Turkey) for landslide susceptibility mapping by artificial neural networks. Bull Eng Geol Environ 68(3):297–306
Youssef AM (2015) Landslide Susceptibility Delineation in the Ar-Rayth Area, Jizan, Kingdom of Saudi Arabia, by using analytical hierarchy process, frequency ratio, and logistic regression models. Environ Earth Sci. doi:10.1007/s12665-014-4008-9 (Article on line first)
Youssef AM, Maerz N (2013) Overview of some geological hazards in the Saudi Arabia. Environ Earth Sci 70:3115–3130
Youssef AM, Pradhan B, Gaber AFD, Buchroithner MF (2009a) Geomorphological Hazards Analysis along the Egyptian Red Sea Coast between Safaga and Quseir. Nat Hazards Earth Syst Sci 9:751–766
Youssef AM, Maerz NH, Hassan AM (2009b) Remote sensing applications to geological problems in Egypt: case study, slope instability investigation, Sharm El-Sheikh/Ras-Nasrani Area, Southern Sinai. Landslides 6(4):353–360
Youssef AM, Maerz HN, Al-Otaibi AA (2012) Stability of rock slopes along raidah escarpment road, Asir Area, Kingdom of Saudi Arabia. J Geogr. doi:10.5539/jgg.v4n2p48
Youssef AM, Pradhan B, Maerz HN (2013) Debris flow impact assessment caused by 14 April 2012 rainfall along the Al-Hada Highway, Kingdom of Saudi Arabia using high-resolution satellite imagery. Arab J Geosci. doi:10.1007/s12517-013-0935-0
Youssef AM, Al-Kathery M, El-Sahly T, Pradhan B (2014a) Debris flow impact assessment along the Al-Raith Road, Kingdom of Saudi Arabia using remote sensing data and field investigations. Geomat Nat Hazards Risk. doi:10.1080/19475705.2014.933130
Youssef AM, Al-Kathery M, Pradhan B (2014b) Landslide susceptibility mapping at Al-Hasher Area, Jizan (Saudi Arabia) using GIS-based frequency ratio and index of entropy models. Geosci J. doi:10.1007/s12303-014-0032-8
Youssef AM, Pradhan B, Jebur MN, El-Harbi HM (2014c) Landslide susceptibility mapping using ensemble bivariate and multivariate statistical models in Fayfa area, Saudi Arabia. Environ Earth Sci. doi:10.1007/s12665-014-3661-3
Yufeng S, Fengxiang J (2009) Landslide stability analysis based on generalized information entropy. Int Conf Environ Sci Inf Appl Technol 2:83–85
Zare M, Pourghasemi HR, Vafakhah M, Pradhan B (2012) Landslide susceptibility mapping at Vaz Watershed (Iran) using an artificial neural network model: a comparison between multilayer perceptron (MLP) and radial basic function (RBF) algorithms. Arab J Geosci. doi:10.1007/s12517-012-0610-x
Acknowledgments
The authors would like to thank the Saudi Geological Survey for providing scientific and logistical support for this work. Also, we would like to thank the anonymous reviewers for their critical comments on the earlier version of the manuscript.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Youssef, A.M., Pourghasemi, H.R., El-Haddad, B.A. et al. Landslide susceptibility maps using different probabilistic and bivariate statistical models and comparison of their performance at Wadi Itwad Basin, Asir Region, Saudi Arabia. Bull Eng Geol Environ 75, 63–87 (2016). https://doi.org/10.1007/s10064-015-0734-9
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10064-015-0734-9
Keywords
- Landslide
- Susceptibility mapping
- Frequency ratio
- Weights of evidence
- Index of entropy
- Dempster–Shafer
- GIS
- Saudi Arabia