بررسي تأثير تراز آب شيرين رودخانه، چگالي آب دريا و كارآيي سيستم پرده ي حباب هوا در جلوگيري از پيشروي آب شور در آب هاي سطحي

Effect of freshwater river level, seawater density, and efficiency of air bubble curtain system on preventing saline water intrusion in surface water

پيشروي آب شور دريا به سمت رودخانه باعث تنزل كيفيت آب شيرين مي‌شود. كنترل هيدروليكي پيشروي آب دريا به منظور كاستن از تبعات منفي آن، مستلزم شناخت هر چه بهتر مكانيزم‌هاي مؤثر در آن است. در پژوهش حاضر سعي شده است تا با مدل‌سازي عددي نفوذ شوري در آب سطحي با استفاده از نرم‌افزار انسيس فلوئنت به بررسي تأثير تغيير چگالي آب دريا و همچنين تراز آب رودخانه در ميزان نفوذ شوري پرداخته شود. همچنين سيستم پرده‌ي حباب هوا به‌عنوان راهكاري براي جلوگيري از پيشروي شوري بررسي شده است. نتايج حاكي از آن است كه چگالي آب دريا و تراز آب رودخانه با ميزان پيشروي آب شور رابطه‌ي مستقيم دارند. بدين‌گونه كه به ازاء افزايش 2/0 درصد چگالي آب دريا، ميزان پيشروي آب شور به ميزان 86 درصد بيشتر مي‌شود و با كاهش 19 درصدتراز رودخانه، نفوذ شوري به ميزان 45 درصد كاهش مي‌يابد. همچنين سيستم پرده‌ي حباب هوا با ايجاد جريان چرخشي از پيشروي آب شور در آب شيرين جلوگيري مي‌كند.

Water quality is crucial to the development and management of water resources. Therefore, maintaining water quality, especially freshwater, which constitutes the major human consumption for a variety of drinking, agricultural, and industrial uses is important. Water quality is reduced by various natural and anthropogenic factors. One of the most common and important processes that reduces the quality of water resources is the influence of saline sea water on surface water. Seawater infiltration is a natural process due to the difference in the density of seawater from fresh water. Seawater is denser than fresh water because of the presence of minerals such as salt. The higher density of seawater causes it to be submerged under freshwater and, on the contact surface, seawater penetrates into the freshwater wedge. Salt water intrusion of sea toward the river caused a decrease in the quality of fresh water which makes it useless for utilizing in agricultural, industrial, and drinking and led to obliterating this fertilized plain upon its infiltration into the surrounding land. In order to reduce these negative effects through hydraulical control of salt water intrusion, we need to know about the efficacious mechanism of this issue. Thus, this study using ANSYS Fluent for modeling salt water intrusion on the surface water examined influences of changing in the sea water density and the water level of river on the measure of salinity intrusion. Also, air bubble curtain system as an alternative to preventing salt water intrusion was investigated. Results showed that sea water density and the water level of river had direct relationship with salinity intrusion, which means that upon an increase in the sea water density or the water level of river, salt water intrusion will increase, vice versa. Therefore, penetrating salinity increased by 86% with an 0.2% increase in saltwater density and was decreased %45 by decreasing %19 at river water level. Air bubble curtain system by creating impeding bubble between salt and fresh water is an appropriate solution for preventing salt water intrusion.