In this section the project basic information is presented in form of following
This project is located in mountainous area of Zagros with geographical coordinates of average height of 625 meter. Standard deviation of height model of the region is equal to 531 which show high “ups and downs” of the dam structured area and altitudinal parameter increase in direction of north-east.
Average annual temperature near the dam structure is about 25.5˚C. Monthly & annually thermal gradient shows that alternation of temperature is 0.9˚C for each 100 meters. The surrounding meteorology stations are evaporation measuring stations of Lali, Shahid Abbaspour dam, Sousan, Izeh, Godarlandarand barangard and also Masjed Soleiman and Izeh Nisoptic stations. Considering the studies, these stations’ reports are relatively accurate, but there are some statistical problems.
The most humid months of the year are December and January and the most arid months are June, July and August, when the average percentage of humidity is about 26% and the maximum average of humidity is 74% in January that might go up to 84%. The rainiest months of the year are December, January, February, March and the most arid months are June, July and August.
Rainfall amount in spring is 8 & 9%, in summer 5 &0%, and in fall and winter 2, 29, 5 and 60%. Region climate is semi-arid in lower altitudes and it is Mediterranean in higher altitudes.
Masjed Soleiman dam has two general middle and upstream region. The middle area is about 2005 square kilometer and the upstream area is about 27548 square kilometer.
Concentration time for Masjed Soleiman dam is 10 hours. Water measuring stations around the dam are Pol Shaloo, Karun 1 and Gatvand.
According to discharge studies, the discharge peak for Masjed Soleiman dam in periods of 50, 100, 1000 and 10000 years are equal to 6000, 6800, 9300 and 11400 m3/s. Also PMF discharge is equal to 21700.
Masjed Soleiman reservoir ware is generally used for power generation and a little portion of it is transferred to the pumping station of Masjed Soleiman city.
Water quality is reported to be suitable for drinking after physical filtration process.
It is obvious that reservoir water is also suitable for agricultural purposes due to its component.
The sources of Sedimentation entrance to the dam reservoir are Shour and Marghab Rivers, Karun 1 dam and minor waterways between the area of Masjed Soleiman and Karun 1 dams. Totally in the carried out studies the sedimentation volume of Masjed Soleiman reservoir is estimated to be 10 × 4.13 tone/year.
|Planning the water resources|
There is no data for this issue.
Masjed Soleiman project is situated in a few hundred meters upstream of Karun River valley entrance. The entrance of this valley consists of layers of “brown to red” stones with gypsum grains, which belong to the Aghajary Sazand and some sandstone and tiny grains of Conglomerate.
In this area, layers have gradient in direction of upstream. The more we go toward the upstream, the thicker limestone conglomerates dominate inter-layers of stone-sediments, which increase with the increasing of sea level and form the basis of Bakhtiari Sazand.
Bakhtyari Sazand in its higher parts generally consists of very big pieces of conglomerate. In dam structure, Bakhtyary Sazand can be divided into 10 smaller stone units. Among these units three of them are stone-sediments and the rest are conglomerate.
Stones of both Bakhtiari and Aghajari Sazands, in the dam structure, consist of 40% conglomerate, 20% sands and 40% stone-sediments with thick layers or without any layer. Banks of valley consist of thick materials and down-flow stones with large conglomerate pieces. Sandy alluvium has sedimented in right bank of the river and in down-stream of powerhouse. There, an old route of the river is filled with sands up to 50 meters above the river level. Generally stone layers are only having slight crevices, but because of tension phenomena, most of the crevices have changed into the wide ones.
Seismicity activity in Zagros region typically consists of small earthquakes at the surface level.
Generally there is no trace of great faults at the land level. So the main existing faults in the studied area for this project are either the inverted faults or they have important pressure part. It should be remembered that superficial faulting generally has no direct relation to the underground center of the earthquakes.
From analysis of earthquake centers within the studied area, the following results are evident:
6.1% of earthquakes have the focal depths of less than 15 kilometers, about 75% have the focal depth of less than 50 kilometer and 97% have the focal depth of less than 100 kilometer.
Masjed Soleiman dam has a reservoir of 261 million m3 volume in normal level. The useful volume is reported to be 239 million m3. The geological structure in dam site consists of clay, sand and conglomerate layers. Existing clay layers and their slope toward the reservoir has caused the suitable sealing of foundation.