Spatial Assessment of the Effects of Afforestation Scenarios on Erosion Risk Using the ICONA Model: A Case Study from the Terme Stream Watershed

Öz

This study evaluates the spatial distribution of erosion risk in the Terme Stream Catchment, located in Çankırı Province, using the ICONA model. The analysis incorporates parameters such as existing land cover, slope, geological structure, and vegetation canopy density. Four afforestation scenarios (10%, 20%, 30%, and 50% increase) were developed to examine potential changes in erosion risk. Results indicate that 67.8% of the catchment is currently under high and very high erosion risk. Scenario analyses revealed significant reductions in erosion risk with increasing afforestation rates, with the 30% targeted afforestation scenario providing the most cost-effective solution. The study demonstrates the applicability of the ICONA model under Turkish conditions and contributes scientifically to the development of sustainable land management and erosion control strategies at the watershed scale.

Anahtar Kelimeler

• Soil conservation
• Erosion
• Semi-arid
• GIS
• Çankırı

Ağaçlandırma Senaryolarının Erozyon Riski Üzerindeki Etkisinin ICONA Modeli ile Mekânsal Değerlendirilmesi: Terme Çayı Havzası Örneği

Öz

Bu çalışmada, Çankırı ili sınırlarında yer alan Terme Çayı Havzası’nda erozyon riskinin mekânsal dağılımı ICONA modeli kullanılarak değerlendirilmiştir. Analizlerde havzanın mevcut arazi örtüsü, eğim, jeolojik yapı ve bitki örtüsü kapalılığı parametreleri kullanılmış ve dört farklı ağaçlandırma senaryosu (%10, %20, %30 ve %50 artış) oluşturularak erozyon riskindeki olası değişimler karşılaştırılmıştır. Sonuçlar, mevcut durumda havzanın %67.8’inin yüksek ve çok yüksek erozyon riski altında olduğunu ortaya koymuştur. Senaryo analizleri, ağaçlandırma oranı arttıkça erozyon riskinde belirgin azalmalar olduğunu göstermiş; özellikle %30 oranındaki hedefli ağaçlandırma uygulamasının maliyet-yarar dengesi açısından en verimli seçenek olduğu belirlenmiştir. Çalışma, ICONA modelinin Türkiye koşullarında uygulanabilirliğini ortaya koymakta ve havza bazlı sürdürülebilir arazi yönetimi ile erozyon kontrol stratejilerinin geliştirilmesine bilimsel katkı sunmaktadır.

Anahtar Kelimeler

• Toprak koruma
• Erozyon
• Yarı-kurak
• CBS
• Çankırı

Kaynakça

1. Al Balasmeh O, Karmaker T, Babbar R (2023) Experimental investigation and modelling of rainfall-induced erosion of semi-arid region soil under various vegetative land covers. Journal of Hydroinformatics, 25(3):1029-1053, https://doi.org/10.2166/hydro.2023.213
2. Bai L, Wang N, Jiao J, Chen Y, Tang B, Wang H, Wang Z (2020) Soil erosion and sediment interception by check dams in a watershed for an extreme rainstorm on the Loess Plateau, China. International Journal of Sediment Research, 35:408-416. https://doi.org/10.1016/j.ijsrc.2020.03.005
3. Bayramin İ, Dengiz O, Başkan O, Parlak M (2003) Soil erosion risk assessment with ICONA model; case study: Beypazarı area. Turk J Agric For, 27:105-116.
4. Bilgiç S, Er S (2025) Malatya ilinde ICONA yöntemi ile CBS ve uzaktan algılama tabanlı erozyon risk analizi. Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi, 14(1):350–359. https://doi.org/10.28948/ngumuh.1587977
5. Borrelli P, Robinson DA, Fleischer LR, Lugato E, Ballabio C, Alewell C, Meusburger K, Modugno S, Schütt B, Ferro V, Bagarello V, Van Oost K, Montanarella L, Panagos P (2017) An assessment of the global impact of 21st century land use change on soil erosion. Nature Communications, 8: 2013. https://doi.org/10.1038/s41467-017-02142-7
6. Carlson TN, Ripley DA (1997) On the relation between NDVI, fractional vegetation cover, and leaf area index. Remote sensing of Environment,62(3):241-251. https://doi.org/10.1016/S0034-4257(97)00104-1
7. Chirino E, Bonet A, Bellot J, Sánchez JR (2006) Effects of 30-year-old Aleppo pine plantations on runoff, soil erosion, and plant diversity in a semi-arid landscape in South Eastern Spain. Catena, 65(1):19-29. https://doi.org/10.1016/j.catena.2005.09.003
8. Chowdary VM, Chakraborty D, Jeyaram A, Murthy YVN, Sharma JR, Dadhwal VK (2013) Multi-Criteria decision making approach for watershed prioritization using analytic hierarchy process technique and GIS. Water Resources Management, 27:3555-3571. https://doi.org/10.1007/s11269-013-0364-6

9. Demir S, Dursun İ (2024) Assessment of pre- and post-fire erosion using the RUSLE equation in a watershed affected by the forest fire on Google Earth Engine: the study of Manavgat River Basin. Natural Hazards, 120(3):2499–2527. https://doi.org/10.1007/s11069-023-06291-5
10. Demirci U, Yıldırımer S (2024) Economic Analysis Approaches for the Erosion Prevention Function of Forests. In P.D.L. ARIN (Ed.), Orman Mühendisliği Alanında Akademik Analizler. YAZ Yayınları. https://doi.org/10.5281/zenodo.10868234
11. Dengiz O, İmamoğlu A, Saygın F, Göl C, Ediş S, Doğan A (2014) İnebolu Havzasi’nın ICONA modeli İle toprak erozyon risk değerlendirmesi. Anadolu Tarım Bilimleri Dergisi, 29 (2):136-142. https://doi.org/10.7161/anajas.2014.29.2.136-142
12. Dilek EF, Şahin Ş, Yılmazer İ (2008) Afforestation areas defined by GIS in Gölbaşı specially protected area, Ankara/Turkey. Environ Monit Assess, 144 (1):251-259. https://doi.org/10.1007/s10661-007-9985-7
13. Dursun İ (2025) An integrated analytical approach to sub-watershed prioritization and erosion risk assessment in the Salda Lake Basin, Türkiye. Environ Earth Sci, 84:428. https://doi.org/10.1007/s12665-025-12434-7
14. Dutal H (2022) Determination of the impact of forest fires on soil erosion risk by using the ICONA model: a case study of Ayvali Dam watershed. Turkish Journal of Forest Science. 6(2):510-538. https://doi.org/10.32328/turkjforsci.1167356
15. Ediş S, Timur ÖB, Tuttu G, Aytaş İ, Göl C, Özcan AU (2023) Assessing the impact of engineering measures and vegetation restoration on soil erosion: a case study in Osmancık, Türkiye. Sustainability, 15(15):12001. https://doi.org/10.3390/su151512001
16. Erpul G, İnce K, Demirhan A, Küçümen A, Akdağ MA, Demirtaş İ, Şahin S (2020) Su Erozyonu İl İstatistikleri-Toprak Erozyonu Kontrol Stratejileri. Çölleşme ve Erozyonla Mücadele Genel Müdürlüğü Yayınları. Ankara.
17. Esmaeili Gholzom H, Ahmadi H, Moeini A, Motamed Vaziri B (2021) Water erosion risk assessment in the Kasilian watershed with ICONA model and GIS/RS techniques. Res Earth Sci, 12(3):144–163. https://doi.org/10.48308/esrj.2021.100753
18. Esmaeili Gholzom H, Moeini A, Ahmadi H, Motamed Vaziri B (2022) Soil erosion risk assessment in the natural and planted forests using ICONA model and GIS technique. Int. J. Environ. Sci. Technol, 19:3947–3962. https://doi.org/10.1007/s13762-021-03536-3
19. Everest T, Sungur A, Özcan H (2025) ICONA modeli ile Biga Yarımadası güneybatı bölümünün erozyon risk değerlendirmesi. Türk Coğrafya Dergisi, 13(1):59-69. https://doi.org/10.33202/comuagri.1645843
20. Fenta AA, Yasuda H, Shimizu K, Haregeweyn N, Negussie A (2016) Dynamics of soil erosion as influenced by watershed management practices: a case study of the Agula Watershed in the semi-arid highlands of Northern Ethiopia. Environ. Management, 58(5):889-905. https://doi.org/10.1007/s00267-016-0757-4
21. Gammoudi A, Guesmi H, Tebini A, Attia R, Sahli Chahed T, Trabelsi H (2025) Soil degradation risk prediction in an arid region (Northern Tataouine, Tunisia): using an empirical model coupling with remote sensing and GIS. Environ Res Commun. 7(1):015019. https://doi.org/10.1088/2515-7620/ada879
22. Harliando DP, Setyawan C, Mawandha HG (2023) Spatial modeling of vegetation cover for soil erosion control based on Arc GIS and the RUSLE models. Journal Teknik Pertanian Lampung (Journal of Agricultural Engineering). 12(1):14-27. https://doi.org/10.23960/jtep-l.v12i1.14-27
23. Huang Y, Wei W, Chen S (2024) Effect of terraces and rainfall on water and soil loss in Pinus tabulaeformis plantations in the semiarid Loess hilly region of China. Ecohydrology. 17(8): e2720. https://doi.org/10.1002/eco.2720
24. Ishaq HK, Grilli E, D’Ascoli R, Mastrocicco M, Rutigliano AF, Marzaioli R (2025) Soil quality under rotational and conventional grazing in Mediterranean areas at desertification risk. Journal of Environmental Management, 373:123822. https://doi.org/10.1016/j.jenvman.2024.123822
25. Issaka S, Ashraf MA (2017) Impact of soil erosion and degradation on water quality: a review. Geol Ecol and Landscapes, 1:1-11. https://doi.org/10.1080/24749508.2017.1301053
26. İmal B, Yılmaz S, Sağlıcak Y, Kondur Y, Şimşek Z, Öner N (2007) Çankırı (Tümçam)’da yarı kurak ağaçlandırma çalışmalarının değerlendirilmesi. Türkiye’de Yarı kurak Bölgelerde Yapılan Ağaçlandırma ve Erozyon Kontrolü Uygulamalarının Değerlendirilmesi Çalıştayı Bildirileri, 1:66–71, Nevşehir.
27. İmal B, Öner N (2008) Yarı Kurak Bir Alan Özelliği Gösteren Çankırı İlinde Uygulanabilecek Ağaçlandırma Teknikleri. IV. Çankırı Kültürü Bilgi Şöleni Bildirileri, 231–245, Çankırı.
28. Jie C, Jing-zhang C, Man-zhi T, Zi-tong G (2002) Soil degradation: a global problem endangering sustainable development. Journal of Geographical Sciences, 12:243–252. https://doi.org/10.1007/BF02837480
29. Karakoca E (2025) CBS ve uzaktan algılama teknikleri ile ICONA modeli kullanılarak Katrancı Çayı Havzası’nda (Haymana, Ankara) toprak erozyonu duyarlılığının değerlendirilmesi. Jeomorfolojik Araştırmalar Dergisi, 14:126–145. https://doi.org/10.46453/jader.1653839
30. Kılıç OM (2022) Evaluation of future sediment yield and sediment retention capacity with InVEST model under climate change scenarios in Yeşilırmak Basin. Turkish Journal of Agriculture – Food Science and Technology, 10(7):1318–1328. https://doi.org/10.24925/turjaf.v10i7.1318-1328.5302
31. Kokila A, Nagarajaiah C, Hanumanthappa DC, Shivanna BK, Sathish K, Mahadevamurthy M (2024) Effect of tree canopy cover on soil moisture dynamics in different agroforestry systems under semi-arid condition. Int J Environ Clim Change, 14(9):485-495. https://doi.org/10.9734/ijecc/2024/v14i94432
32. Kuzucu M, Gül İ (2024) Erosion Control in Pastures [in Turkish]. In Strategies for Reforestation and Sustainable Fruit Farming. 45-72. Nobel Yayınları.
33. Liu YF, Liu Y, Shi ZH, Lopez-Vicente M, Wu GL (2020) Effectiveness of re-vegetated forest and grassland on soil erosion control in the semi-arid Loess Plateau. Catena, 195:104787. https://doi.org/10.1016/j.catena.2020.104787
34. MAPA/ICONA (1983) Paisajes erosivos en el sureste español: Ensayo de metodología para el estudio de su cualificación y cuantificación. Ministerio de Agricultura de España.
35. Oldeman LR (1997) Soil degradation: a threat to food security?. In International Conference on Time Ecology:" Time for Soil Culture-Temporal Perspectives on Sustainable Use of Soil", April 6-9, 1997, Tutzing (p. 15). ISRIC
36. Olivares B, Verbist K, Lobo D, Vargas R, Silva O (2011) Evaluation of the USLE model to estimate water erosion in an Alfisol. Journal of Soil Science and Plant Nutrition, 11(2):72–85. http://dx.doi.org/10.4067/S0718-95162011000200007
37. Özvan H, Arık B, Satır O, Bostan P (2022) Bendimahi alt havzası potansiyel erozyon riskinin CORINE ve ICONA modelleri kullanılarak haritalanması. Harran Tarım ve Gıda Bilimleri Dergisi, 26(3):389–404. https://doi.org/10.29050/harranziraat.1128828
38. Panagos P, Borrelli P, Poesen J, Ballabio C, Lugato E, Meusburger K, Montanarella L, Alewell C (2015) The new assessment of soil loss by water erosion in Europe. Environ Sci Policy, 54:438–447. https://doi.org/10.1016/j.envsci.2015.08.012
39. Porto P, Walling DE, Callegari G (2009) Investigating the effects of afforestation on soil erosion and sediment mobilisation in two small catchments in southern Italy. Catena, 79(3):181–188. https://doi.org/10.1016/j.catena.2009.01.007
40. Prasetyo A, Setyawan C, Tirtalistyani R (2021) Vegetation Cover Modelling for Soil Erosion Control in Agricultural Watershed. In IOP Conference Series: Earth and Environmental Science (Vol. 653, No. 1, p. 012033). IOP Publishing.
41. Reis M, Dutal H, Bolat N, Savacı G (2017) Soil erosion risk assessment using GIS and ICONA: a case study in Kahramanmaraş, Turkey. J Agric Fac Gaziosmanpaşa University, 34(1):64-75. https://doi.org/10.13002/jafag4208
42. Ricci GF, Jeong J, de Girolamo AM, Gentile F (2020) Effectiveness and feasibility of different management practices to reduce soil erosion in an agricultural watershed. Land Use Policy, 90:104306. https://doi.org/10.1016/j.landusepol.2019.104306
43. Satır O, Yeler ST, Dönmez C, Paul C (2023) Evaluating ecosystem service changes in a frame of transportation development in Istanbul. Environ Monit Assess, 195:801. https://doi.org/10.1007/s10661-023-11404-5
44. Soboka DM, Mohammed M (2024) Spatial assessment of soil erosion risk using RUSLE and GIS in Dhumuga Watershed, Ambo, Ethiopia. American Journal of Environmental Science and Engineering, 8(4):100-106. https://doi.org/10.11648/j.ajese.20240804.12
45. Şengüler İ (2007) Orta-Şabanözü (Çankırı) yöresinin jeolojisi ve kömür potansiyeli. Jeoloji Mühendisliği Dergisi, 31(1):15-24.
46. Terzi F, Tezer A, Türkay Z, Uzun O, Köylü P, Karacor E, Okay N, Kaya M (2020) An ecosystem services-based approach for decision-making in urban planning. J Environ Plann Manage, 63(3):433-452. https://doi.org/10.1080/09640568.2019.1591355
47. Tombuş FE, Yüksel M, Coşar M, Ozulu İM (2012) Researching the Effects of Temporal NDVI in ICONA Erosion Risk. In: IV. Uzaktan Algılama ve CBS Sempozyumu, Zonguldak.
48. Uzun O, Gültekin P (2011) Process analysis in landscape planning, the example of Sakarya/Kocaali. Sci Res Essays, 6(2):313-331. https://doi.org/10.5897/SRE10.716
49. Xin W, Deng X, Zhang F (2019) Scale effects of vegetation restoration on soil and water conservation in a semi-arid region in China: Resources conservation and sustainable management. Resour Conserv Recycl, 151:104474. https://doi.org/10.1016/j.resconrec.2019.104474
50. Yıldırımer S, Özalp M (2024) Evaluation of hydrological parameters and sediment dynamics in the borçka dam watershed using the SWAT model. Artvin Çoruh Üniversitesi Orman Fakültesi Dergisi, 25(1):111-127. https://doi.org/10.17474/artvinofd.1426951
51. Yıldız NE, Kahveci B (2024) ICONA modeli kullanılarak toprak erozyonu riskinin tahmin edilmesi: Ankara ili örneği. Journal of Anatolian Environmental and Animal Sciences, 9(4):822-831. https://doi.org/10.35229/jaes.1591959
52. Zhao J, Feng X, Deng L, Yang Y, Zhao Z, Zhao P, Fu B (2020) Quantifying the effects of vegetation restorations on the soil erosion export and nutrient loss on the Loess Plateau. Frontiers in Plant Science, 11: 573126. https://doi.org/10.3389/fpls.2020.573126