| Temporal and spatial variation features and genetic analysis of groundwater level and water quality in the delta oasis of the Weigan River and Kuqa River in the last decade |
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| DOI：10.7606/j.issn.1000-7601.2010.01.38 |
| Key Words: Weigan River and Kuqa River oasis groundwater level groundwater quality temporal and spatial variation cause |
| Author Name | Affiliation | | Mansur · Sabit | College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi, Xinjiang 83005, China | | WU Shengli | College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi, Xinjiang 83005, China | | Lutpulla · Imin | College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi, Xinjiang 83005, China |
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| Abstract: |
| According to the data from the 30 observation wells which are distributed in the delta oasis of the Weigan River and Kuqa River, we analyze the temporal and spatial variation features of the underground water l
evel and water quality during recent 10a in this area. The results show that (1) The absolute elevation of the groundwater rise from south to north in the study area, and the river flows from north to south or southeast, but the depth of the groundwater is not impacted by the big grain, and it is controlled by the local geomorphy and the way of land use. The basic law to the depth of the groundwater is that it is deeper in the western agricultural district, the Furukawa of the Weigan River and in the north of the alluvial fan, but it is lower in the eastern agricultural district, the farming-pastoral zone, and in the north of the a
lluvial fan. (2) During the last decade, the groundwater level dropped by 1.00 m, and the largest decline amplitude is 1.34 m in the western irrigation district; and the smallest decline amplitude is 0.41 m in the farming-pastoral zone; the groundwater salinity reduces 0.54 g/L in average, and the largest decline a
mplitude of the salinity is 1.36 g/L in the farming pastoral zone, but it rises by 0.43 g/L in the Furukawa of the Weigan River. (3) Because of the irrigation and evaporation, there are some differences to the groundwater level in a year and water quality in the study areas. The difference is 0.84 m between the highest and the lowest water level in a year, and the biggest difference is 1.04 m in the central of the alluvial fan, and the smallest is 0.73 m in the north (the upstream), and in the normal year, the lowest water level is on February, and the highes
t on April; There is a little change to the water quality of the groundwater in a year, and the difference is only 0.21 g/L between the highest and the lowest salinity seasons in a year, and the biggest difference is 0.51 g/L in the south of the alluvial fan(the downstream) during the different seasons, and the smallest is 0.17 g/L in the central of the alluvial fan. (4) Evaporation and human activities of agricultural production are the main reasons for the temporal and spatial variation of the depth of the groundwater and water quality, and with the opening and running of the main drainage ditch, lowering the groundwater level and salinity of the corresponding terrene. |
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