The new quasi-geoid model IRQG09 for Iran |
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| Authors: | Ramin Kiamehr |
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| Affiliation: | 1. Dipartimento di Ingegneria e Geologia, Università G. D''Annunzio di Chieti-Pescara, Italy;2. Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Italy;3. Institute of Earth Sciences, Université de Lausanne, Switzerland;4. Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy;5. Faculty of Mining and Geology, University of Belgrade, Serbia;1. Mineralogy-Geology Laboratory, Department of Natural Resources Development and Agricultural Engineering, Agricultural University of Athens, 75 Iera Odos Str, 118-55, Athens, Greece;2. Geoskopio SA – EDAFOMICHANIKI GROUP, 19 Emmanouil Papadaki Str, 141 21, N. Iraklio, Greece;3. Interface Geohazard Consulting LLC, 20 Plumeria Pl, Lahaina, HI, 96761, USA;1. Dept. of Water, Wastewater, and Environmental Engineer, Shahid Beheshti University, Tehran, Iran;2. Dept. of Soil Science, Sari Agricultural Sciences and Natural Resources University, Sari, Iran;3. Dep. of Water Eng., Faculty of Agriculture, Fasa University, Fasa, Iran;1. Geosciences Division, Marine, Geo and Planetary Sciences Group, Space Applications Centre (ISRO), Ahmedabad 380 015, India;2. Space Applications Centre (ISRO), Ahmedabad 380 015, India;3. Wadia Institute of Himalayan Geology, Dehradun 248 001, India;4. Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India;5. CSIR – National Institute of Oceanography, Dona Paula, Goa 403 004, India;1. Changjiang River Scientific Research Institute, Changjiang Water Resources Commission of the Ministry of Water Resources of China, Wuhan 430010, China;2. Hubei Key Laboratory of Water Resources & Eco-Environmental Sciences, Changjiang River Scientific Research Institute, Wuhan 430010, China;3. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;4. Hubei Provincial Key Lab of Water System Science for Sponge City Construction, Wuhan University, Wuhan 430072, China;5. Department of Geosciences, University of Oslo, PO Box 1047 Blindern, 0316 Oslo, Norway |
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| Abstract: | Iran is a mountainous country with large lateral density variations of its crust. Constant density value is commonly used to determine the geoid models as well as topographic corrections. The effect of lateral density variation in the geoid can reach up to 14 cm in Iran which is not negligible in a precise geoid modelling. Also, the current height datum of Iran is based on the orthometric system but the effect of gravity variation was not applied in height parameter. Furthermore, the height systems of most neighbouring countries are defined as normal height. Connection of networks can be useful for the unification of height datum, geodynamics researches and optimal adjustment of levelling network. The new quasi-geoid model based on a recent EGM2008 global geo-potential model was created to solve the mentioned problem. The main purpose of the present study is to discuss the results of a research project in which a gravimetric quasi-geoid model for Iran was computed based on the least-squares modification of Stokes' formula. The evaluation is made using 475 GPS/levelling height anomalies covering the major parts of the country except the mountainous areas to the North and West. After a 7-parameter fit, the most promising attempt achieved a RMS value of 19 cm for the residuals based on the GPS/levelling data. |
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