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Issa, Issa E
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Publications (10 of 25) Show all publications
Elias, I., Al-Ansari, N., Sherwany, G. & Knutsson, S. (2017). Evaluation and modification of some empirical and semi-empirical approaches for prediction of area-storage capacity curves in reservoirs of dams (ed.). International Journal of Sediment Research, 32(1), 127-135
Open this publication in new window or tab >>Evaluation and modification of some empirical and semi-empirical approaches for prediction of area-storage capacity curves in reservoirs of dams
2017 (English)In: International Journal of Sediment Research, ISSN 1001-6279, Vol. 32, no 1, p. 127-135Article in journal (Refereed) Published
Abstract [en]

The storage capacity of reservoirs is gradually reduced due to sediment accumulation that causes changes in the area-storage capacity (ASC) curves. Establishing these curves and predicting their future change is an important issue for planners, designers and operators of dams. Many empirical and semi-empirical approaches have been suggested for establishing and predicting the future changes for these curves. In this study four empirical and semi-empirical methods were evaluated and three of them were modified to be used for the prediction of changes in the ASC curves due to sedimentation, based on the existing sedimentation survey data for 11 reservoirs in the USA. For evaluation, these approaches were reviewed and used to determine sedimentation depth and establishing the ASC curves for the Mosul dam reservoir (MDR), which is the biggest hydraulic structure on the River Tigris in northern Iraq. MDR started operating in 1986 with a storage capacity of 11.11 km3 and a water surface area 380 km2 at normal operation stage (330 m a.s.l.). The results obtained from these methods were evaluated using observed bathymetric survey data that had been collected in 2011 after 25 years of the operation of the dam. The evaluation results showed three methods had presented more accurate results for estimating water depth or sedimentation depth at dam site with percentage error about 1.06–3.30%. Whilst for establishing ASC curves, one method presented good agreement result with survey data. Furthermore, ASC and sedimentation depths at dam site of MDR for periods 50, 75, 100 and 125 years were estimated using the modified approaches and the area reduction method. The results of the modified methods provided reasonable agreement when compared with the area reduction method proposed by the U.S. Bureau of Reclamation and the agreement became better with an increase in time period.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-9803 (URN)10.1016/j.ijsrc.2015.12.001 (DOI)000399041000014 ()2-s2.0-84956703856 (Scopus ID)87c51886-8a17-47d3-a3d2-a5dc12fa3cd2 (Local ID)87c51886-8a17-47d3-a3d2-a5dc12fa3cd2 (Archive number)87c51886-8a17-47d3-a3d2-a5dc12fa3cd2 (OAI)
Note

Validerad; 2017; Nivå 2; 2017-04-03 (rokbeg)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-09-13Bibliographically approved
Elias, I., Al-Ansari, N. & Knutsson, S. (2015). Area-Storage Capacity curves for Mosul Dam, Iraq Using Empirical and Semi-Empirical Approaches (ed.). Paper presented at ICOLD Congress 2015 : International Commission on Large Dams 15/06/2015 - 16/07/2015. Paper presented at ICOLD Congress 2015 : International Commission on Large Dams 15/06/2015 - 16/07/2015.
Open this publication in new window or tab >>Area-Storage Capacity curves for Mosul Dam, Iraq Using Empirical and Semi-Empirical Approaches
2015 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

The storage capacity of reservoirs is gradually depleted due to sediment accumulation that causes changes in the area-storage capacity curves (ASC). These curves are important for planners, designers and operators of dams. Many empirical and semi-empirical approaches have been suggested for establishing and predicting these curves. In this study four empirical and semi-empirical methods were evaluated and used to determine the ASC curves for Mosul dam reservoir (MDR), which is the biggest hydraulic structure on the River Tigris in northern Iraq. MDR started operating in 1986 with a storage capacity of 11.11 km3 and a water surface area 380 km2 at normal operation stage (330 m a.s.l.). The results obtained from these methods were evaluated using observed bathymetric survey data that had been collected in 2011 after 25 years of the operation of the dam. The evaluation results showed three methods presented more accurate results for estimating water depth or sedimentation depth at dam site with percentage error about 1.06% to 3.295%.

National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-37900 (URN)c172d4a3-cf23-49bb-95a0-c966a724488c (Local ID)c172d4a3-cf23-49bb-95a0-c966a724488c (Archive number)c172d4a3-cf23-49bb-95a0-c966a724488c (OAI)
Conference
ICOLD Congress 2015 : International Commission on Large Dams 15/06/2015 - 16/07/2015
Note
Godkänd; 2015; 20150720 (nadhir)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Issa, I. E., Al-Ansari, N., Knutsson, S. & Sherwany, G. (2015). Monitoring and Evaluating the Sedimentation Process in Mosul Dam Reservoir Using Trap Efficiency Approaches (ed.). Paper presented at . Engineering, 7(4), 190-202
Open this publication in new window or tab >>Monitoring and Evaluating the Sedimentation Process in Mosul Dam Reservoir Using Trap Efficiency Approaches
2015 (English)In: Engineering, ISSN 1947-3931, E-ISSN 1947-394X, Vol. 7, no 4, p. 190-202Article in journal (Refereed) Published
Abstract [en]

Reservoirs are usually exposed to sediment accumulation problems that will lead to reduction in their storage capacity. This problem directly affects the performance of the dams and causes shortage of their useful life. The simplest technique to estimate sediment deposition rate is using sediment rating curve with sediment trapping efficiency (TE) of the reservoir. Many empirical and semi-empirical approaches have been suggested for to determine this term depending on the annual inflow rate, reservoir characteristics and features of the catchments area. In this study six different empirical methods depending on the residence time principle (water retention time) were used. These approaches were reviewed and applied to determine TE of Mosul dam reservoir (MDR) for period 1986 to 2011. The monthly operating data for inflow, outflow and water elevations for MDR were used to determine monthly TE and long-term TE for whole period of MDR using the mentioned methods. Furthermore, the monthly inflow rate for River Tigris upstream MDR, its sediment rating curve and sediment feeding from valleys around MDR were used to estimate the amount sediment coming to the reservoir. The results provided by these methods for TE withsediment coming to MDR were used to compute the amount of sediment deposited in MDR on monthly bases during this period. The results obtained were evaluated using observed bathymetric survey data that had been collected in 2011 after 25 years of the operation of the dam. The results showed all the mentioned methods gave convergent results and they were very close to bathymetric survey results for estimating the volume of sediment deposited especially that proposed by Ward which gave 0.368% percentage error. Furthermore, the result computed using monthly TE gave good agreement if compared with that long-term TE where the percentage error was ranging between −3.229% to 1.674% for monthly adopted data and −4.862% to −2.477% for whole period data. It is believed that this work will help others to use this procedure on other reservoirs.

National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-13628 (URN)10.4236/eng.2015.74015 (DOI)ce00adb0-e011-4080-ab47-4fd42b0eb290 (Local ID)ce00adb0-e011-4080-ab47-4fd42b0eb290 (Archive number)ce00adb0-e011-4080-ab47-4fd42b0eb290 (OAI)
Note
Validerad; 2015; Nivå 1; 20150410 (nadhir)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Al-Ansari, N., Adamo, N., Issa, I., Sissakian, V. & Knutsson, S. (2015). Mystery of Mosul Dam the Most Dangerous Dam in the World: Dam Failure and its Consequences (ed.). Journal of Earth Sciences and Geotechnical Engineering, 5(3), 95-111
Open this publication in new window or tab >>Mystery of Mosul Dam the Most Dangerous Dam in the World: Dam Failure and its Consequences
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2015 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 5, no 3, p. 95-111Article in journal (Refereed) Published
Abstract [en]

Worries concerning the possibility of the dam failure due to the seepages under the foundation of Mosul Dam during its construction and operation phases enhanced the application of several dam failure models on Mosul Dam case. All the applied models gave similar results. It was noticed through the models that the wave in case of the dam failure will have a height of 54m and the discharge will be of the order of 551000 m3/sec. This wave will reach the capital city of Iraq “Baghdad” after about 38 hours. The discharge of the River Tigris at Baghdad will be 46000m3/sec and the height of the wave will reach 4m. The propagation of the wave along this distance will cause a catastrophe. About 500000 civilians will die in addition to the unbelievable damage that will be caused to the infrastructure of the country.

Place, publisher, year, edition, pages
Scienpress Ltd, 2015
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-3344 (URN)1286fce7-9f65-4dc3-afff-50c8229402c5 (Local ID)1286fce7-9f65-4dc3-afff-50c8229402c5 (Archive number)1286fce7-9f65-4dc3-afff-50c8229402c5 (OAI)
Note

Validerad; 2015; Nivå 1; 20150505 (nadhir)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-12-14Bibliographically approved
Adamo, N., Al-Ansari, N., Issa, I., Sissakian, V. & Knutsson, S. (2015). Mystery of Mosul Dam the Most Dangerous Dam in the World: Experts Proposals and Ideas on Mosul Dam (ed.). Journal of Earth Sciences and Geotechnical Engineering, 5(3), 79-93
Open this publication in new window or tab >>Mystery of Mosul Dam the Most Dangerous Dam in the World: Experts Proposals and Ideas on Mosul Dam
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2015 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 5, no 3, p. 79-93Article in journal (Refereed) Published
Abstract [en]

During and after the construction of Mosul Dam, in Iraq, all the studies expressed a clear concern on the fact that the region of the dam suffers from extensive presence of soluble rock formations that might undermine the safety of the dam with its large reservoir. Most of the studies dealt with foundation treatment and safety hazards due to the dissolution of gypsum and anhydrite. To overcome the problem, grouting operations were performed. The seepage of water continued and this highlighted the possibility of the dam failure. Different grouting techniques and methods were suggested but the results were the same. Finally, it was decided to limit the maximum operation water level to EL. 319 m (a.s.l.) instead of EL.330 m (a.s.l.). This recommendation has remained in force up to now with the loss of sizable storage of irrigation water and power potential

National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-13372 (URN)c97b6743-1071-4de0-8cf8-12419a9fe0b6 (Local ID)c97b6743-1071-4de0-8cf8-12419a9fe0b6 (Archive number)c97b6743-1071-4de0-8cf8-12419a9fe0b6 (OAI)
Note

Validerad; 2015; Nivå 1; Bibliografisk uppgift: Special Issue: Mystery of Mosul Dam the most Dangerous Dam in the World; 20150505 (nadhir)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-12-14Bibliographically approved
Adamo, N., Al-Ansari, N., Issa, I., Sissakian, V. & Knutsson, S. (2015). Mystery of Mosul Dam the most Dangerous Dam in the World: Foundation Treatment during Construction (ed.). Journal of Earth Sciences and Geotechnical Engineering, 5(3), 59-69
Open this publication in new window or tab >>Mystery of Mosul Dam the most Dangerous Dam in the World: Foundation Treatment during Construction
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2015 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 5, no 3, p. 59-69Article in journal (Refereed) Published
Abstract [en]

Mosul dam was constructed on the beds of Fatha Formation (Middle Miocene). The beds of the formation are about 250 m thick composed of Marls, chalky limestone; gypsum, anhydrite, and limestone form a layered sequence. They are highly karstified. As a consequence, plenty of grouting operations were carried out to fill all the cavities, fractures, joints and to stop the seepage under the foundation of the dam. The main grouting operations were Blanket grouting and deep grout curtain. It was necessary to perform an extensive maintenance program to control the seepage process within the grouted zone to stop dissolution of gypsum and protect the safety of the dam.

Place, publisher, year, edition, pages
Scienpress Ltd, 2015
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-14223 (URN)d931670d-8cda-4941-8737-2b9b13aa4fce (Local ID)d931670d-8cda-4941-8737-2b9b13aa4fce (Archive number)d931670d-8cda-4941-8737-2b9b13aa4fce (OAI)
Note

Validerad; 2015; Nivå 1; Bibliografisk uppgift: Special Issue: Mystery of Mosul Dam the most Dangerous Dam in the World; 20150505 (nadhir)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-12-14Bibliographically approved
Sissakian, V., Al-Ansari, N., Issa, I., Adamo, N. & Knutsson, S. (2015). Mystery of Mosul Dam the most Dangerous Dam in the World: General Geology (ed.). Journal of Earth Sciences and Geotechnical Engineering, 5(3), 1-13
Open this publication in new window or tab >>Mystery of Mosul Dam the most Dangerous Dam in the World: General Geology
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2015 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 5, no 3, p. 1-13Article in journal (Refereed) Published
Abstract [en]

Mosul Dam project is the most important water resources project in Iraq. It is located on the River Tigris in northwestern part of Iraq, about 60 km north of Mosul city. This project is multipurpose project; to provide water for three irrigation projects in the north of Iraq and many other projects in the middle and south of the country, flood control and hydropower generation. Its storage capacity is 11.11 km3. The oldest exposed rocks in the reservoir area belong to the Pila Spi Formation of Late Eocene age, while at the dam site; the oldest exposed rocks belong to the Fatha Formation (ex-Lower Fars) of Middle Miocene age. The topography of the Mosul Dam and reservoir area is characterized by hilly terrain that rise to low mountainous area; representing physiographically Low Mountainous Province. Tectonically, Mosul Dam site and reservoir area are located within the Cham – Chamal Subzone of the Low Folded Zone of the Outer Platform of the Arabian Plate. The project is located far from Zagros Active Seismic Zone, but still many earthquakes were recorded in areas surrounding the project area.

Place, publisher, year, edition, pages
Scienpress Ltd, 2015
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-11229 (URN)a274e911-7c23-4454-ba30-8a43cf3e5a98 (Local ID)a274e911-7c23-4454-ba30-8a43cf3e5a98 (Archive number)a274e911-7c23-4454-ba30-8a43cf3e5a98 (OAI)
Note

Validerad; 2015; Nivå 1; Bibliografisk uppgift: Special Issue: Mystery of Mosul Dam the most Dangerous Dam in the World; 20150505 (nadhir)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-12-14Bibliographically approved
Al-Ansari, N., Adamo, N., Issa, I., Sissakian, V. & Knutsson, S. (2015). Mystery of Mosul Dam the Most Dangerous Dam in the World: Karstification and Sinkholes (ed.). Journal of Earth Sciences and Geotechnical Engineering, 5(3), 33-45
Open this publication in new window or tab >>Mystery of Mosul Dam the Most Dangerous Dam in the World: Karstification and Sinkholes
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2015 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 5, no 3, p. 33-45Article in journal (Refereed) Published
Abstract [en]

The Fatha (ex-Lower Fars) Formation (Middle Miocene) is the predominant stratigraphic unit in the Mosul Dam area. It is about 250 meters thick near Mosul. Marls, chalky limestone, gypsum, anhydrite, and limestone form a layered sequence of rocks under the foundation of the dam. The foundation of the dam is mainly resting on the Fatha Formation (Middle Miocene) which is highly karstified. Karstic limestone and the development of solution cavities within the gypsum and anhydrite layers are the main geological features under the foundation of the dam. The right (west) abutment is located in the steeply dipping Fatha Formation within Butmah East anticline with SE plunge being in the reservoir north of the dam, whereas the left (east) abutment is located on gently dipping beds of the Fatha Formation, which is overlain by fine clastics of the Injana Formation. These differences in lithology as well the dip amount and direction along both abutments as well upstream and downstream of the dam have certainly affected on the hydraulic pressure and increased the dissolution ability of the gypsum and limestone beds, along the abutments and the foundations, which are already karstified in nearby areas. Consequently, more gypsum, anhydrite and limestone beds are dissolved and karst openings are continuously increasing, as the exerted hydraulic pressure is continuous.First appearance of sinkholes on the right bank down-stream was not until approximately six years after the filling of the reservoir began. The surface expression of the sinkholes suggests that they are caused by an under-ground collapse. Concentric tension cracks appear to have developed around the central void as the sinkholes have developed progressively. Karstification and formation of sinkholes are the most dangerous features threatening the safety of Mosul dam.

Place, publisher, year, edition, pages
Scienpress Ltd, 2015
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-6732 (URN)503fdb47-d404-4529-8fdf-beaf309662c2 (Local ID)503fdb47-d404-4529-8fdf-beaf309662c2 (Archive number)503fdb47-d404-4529-8fdf-beaf309662c2 (OAI)
Note

Validerad; 2015; Nivå 1; Bibliografisk uppgift: Special Issue: Mystery of Mosul Dam the most Dangerous Dam in the World; 20150505 (nadhir)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-12-14Bibliographically approved
Adamo, N., Al-Ansari, N., Issa, I., Sissakian, V. & Knutsson, S. (2015). Mystery of Mosul Dam the Most Dangerous Dam in the World: Maintenance Grouting (ed.). Journal of Earth Sciences and Geotechnical Engineering, 5(3), 71-77
Open this publication in new window or tab >>Mystery of Mosul Dam the Most Dangerous Dam in the World: Maintenance Grouting
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2015 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 5, no 3, p. 71-77Article in journal (Refereed) Published
Abstract [en]

Dissolution of gypsum and anhydrite at the foundation of Mosul Dam continued after its construction since 1986 onwards. After impounding, acceptable residual permeability could not be reached and new areas of high grout takes appeared in some other locations. New grout mixes were tested and even methods of delivering and injecting large grout quantities were developed. Sandy mixes were developed by adding certain weight of sand to the cement mix. In addition, pouring gravel after completion of grouting in large takes' zones was performed. As a result of gravel addition, it was concluded that it was not effective and very difficult to pour. Massive grouting was used where bentonite was added to the mix. Piezometric observation was used for checking the conditions of the grout curtain and the detection of problematic areas where additional treatment was required. Massive grouting, however, did not stop the dissolution processes altogether and it seems that it is not likely to do so in the future. The continuation of this program year after year does not preclude some bad implications. More research work is required to improve massive grout durability by adding chemicals which may interact with gypsum beds and hinder dissolution. This can help to improve gypsum resistance and increase its stability. Mathematical models might also be used to understand the mechanism of cavities formation and collapsing.

Place, publisher, year, edition, pages
Scienpress Ltd, 2015
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-9410 (URN)8065eb45-85e0-44db-ba52-a5c9755651e0 (Local ID)8065eb45-85e0-44db-ba52-a5c9755651e0 (Archive number)8065eb45-85e0-44db-ba52-a5c9755651e0 (OAI)
Note

Validerad; 2015; Nivå 1; Bibliografisk uppgift: Special Issue: Mystery of Mosul Dam the most Dangerous Dam in the World; 20150505 (nadhir)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-12-14Bibliographically approved
Adamo, N., Al-Ansari, N., Issa, I., Sissakian, V. & Knutsson, S. (2015). Mystery of Mosul Dam the most Dangerous Dam in the World: Problems Encountered During and after Impounding the Reservoir (ed.). Journal of Earth Sciences and Geotechnical Engineering, 5(3), 47-58
Open this publication in new window or tab >>Mystery of Mosul Dam the most Dangerous Dam in the World: Problems Encountered During and after Impounding the Reservoir
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2015 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 5, no 3, p. 47-58Article in journal (Refereed) Published
Abstract [en]

Mosul dam was built on the River Tigris northern part of Iraq during the period 25th January, 1981 and finished on 24th July, 1986. The foundation of the dam lies on the Fatha Formation. This formation is composed of alternating beds of marls, limestone, gypsum and clay. The beds of this formation are highly karstified. After impounding, several sinkholes developed within the vicinity of the dam site. The surface expression of the sinkholes suggests that they are caused by underground collapse.The appearance of the downstream sinkholes is most likely related to fluctuations in the tail water level of the main dam during operation of the dam and the downstream regulating reservoir. In addition, water seepage also was noticed in various areas indicating the dissolution of gypsum and anhydrite from the foundation. During the period February-August, 1986 the dissolution intensity ranged from 42 to 80 t /day.

Place, publisher, year, edition, pages
Scienpress Ltd, 2015
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-8089 (URN)68810f69-3344-4175-a3da-abe0f9e5ac25 (Local ID)68810f69-3344-4175-a3da-abe0f9e5ac25 (Archive number)68810f69-3344-4175-a3da-abe0f9e5ac25 (OAI)
Note

Validerad; 2015; Nivå 1; Bibliografisk uppgift: Special Issue: Mystery of Mosul Dam the most Dangerous Dam in the World; 20150505 (nadhir)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-12-14Bibliographically approved
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