Abstract:
کارست مجموعه ای از فرایندهای زمین شناسی و پدیدههای حاصل از انحلال سنگ ها درنتیجه بازشدگیها، تخریب و تجزیه سنگها است که رژیم هیدرولوژیکی، شبکه زهکشی و لندفرم های خاص را به وجود میآورد. هدف این پژوهش ارزیابی تاثیر توسعه ژئومورفولوژی کارست و رخداد خشکسالی بر ویژگی های کمی و کیفی آبخوان های کارستی تاقدیس گرین میباشد. برای این منظور چشمههای امیر، چناره، آهنگران، لاغری و تیمور در یک دوره 15 ساله (1394-1380) مورد مطالعه قرار گرفتند. با استفاده از روش SPI میزان خشکسالی و تاثیر آن در منطقه ارزیابی گردید. همچنین میزان توسعه کارست در هر آبخوان براساس روش مالیک و وجکتوا مشخص گردید. با توجه به ارزیابیهای هیدرودینامیکی، درجه توسعهیافتگی کارست در آبخوان چشمه های امیر و چناره بین 5/2 تا 7/2 بوده و دارای سیستم غالب جریان افشان و زیر رژیمهای خطی میباشند. آبخوان چشمه آهنگران دارای درجه توسعه کارست 3/4 بوده و سیستم جریان آنها از نوع مجرایی- افشان میباشد. آبخوان چشمههای، لاغری و تیمور دارای درجه توسعه کارست 5/5 و سیستم جریان مجرایی میباشد. با توجه به توسعه متفاوت ژئومورفولوژی کارست میتوان گفت که در چشمههای لاغری و تیمور به علت پایین بودن اثر حافظه و توسعهیافتگی آبخوان، واکنش دبی به تغییرات بارشی دارای تاخیر زمانی کوتاهمدت بوده است. اما در چشمههای امیر و چناره به علت توسعه اندک کارست، تاثیر خشکسالی با تاخیر حدود 24 ماهه مواجه بوده است. بر اساس نتایج هیدروشیمیایی بالاترین و پایینترین مقادیر TDSبه ترتیب در چشمه های چناره و آهنگران وجود دارد. همچنین بالاترین و پایینترین مقادیر THبه ترتیب مربوط به چشمه های آهنگران و تیمور بوده است.
Introduction
Karst is the result of the dissolution (physical and chemical) in carbonate (limestone and dolomite) and evaporate rocks. Karst developing is affected by climatological and geological factors. In the other words, Karst landscapes and Karst aquifers are formed by the dissolution of carbonate rocks by water rich in carbon dioxide waters. Various processes and factors such as topography, lithology, tectonic, geomorphological and hydrological processes and climatic factors have an important role in the evolution of Karst. Karst aquifers are a precious resource because they provide drinking water for about 25% of the world’s population. Karst Aquifers are typically very productive due to their ability to convey water through a network of interconnected conduits. The analysis of hydrograph recession curves is an often-used method in hydrological studies, providing the interpretation of the characteristics and flow attributes of the aquifer.
The study of hydrodynamic and hydro-chemical properties of springs can be an indicative of the Karst development in Karst media. Social and economic life of cities such as Nourabad, Alashtar, and numerous rural societies is connected to the Gareen Mountains springs. Also the origin of Kashkan and Seymareh rivers is located in the Gareen Mountains. This shows the importance and necessity of studying Karstic springs in this area. The aim of this study is to investigate and evaluate the effect of drought occurrence and Karst geomorphology on the quantitative and qualitative features of Green Antarctic Springs in Lorestan Province.
Material and Methods
2.1. Case Study
The Gareen Mountains in the Zagros Mountain Range is located in the active deforming Zagros fold-thrust belt and Sanandaj-Sirjan zones. The Gareen Mountains is located in the west of Iran. The most important mountains in the area are Velash, Chehel-nabaleghan, Seh-kozan, Higdah-yal and Mishparvar. Alashtar and Nourabad Karst Aquifers are located in the north of Lorestan Province. There are several thrust faults with northwest–southeast strike such as Gareen-Gamasiab and Gareen-Kahman Faults. Nourabad Aquifer is composed mainly by gray limestone rocks, embedded marl limestone, recrystallized limestone and pyroclastic rocks. One of the most important features of the structural geology of the Alashtar Aquifer is the abundance of the sedimentary rocks and scarcity of igneous rocks in this area. Doline, Sinkhole, Cave, Ponor, and several types of Karrens and Karstic Window are the main Karstic features in the area.
2.2. Method
The Standardized Precipitation Index (SPI) is the most commonly used indicator worldwide for detecting and characterizing meteorological droughts. The SPI indicator, which was developed by McKee et al. (1993) and described in detail by Edwards and McKee (1997), measures precipitation anomalies at a given location, based on a comparison of observed total precipitation amounts for an accumulation period of interest (e.g. 1, 3, 12, 48 months) with the long-term historic rainfall record for that period. The historic record is fitted to a probability distribution (the “gamma” distribution), which is then transformed into a normal distribution such that the mean SPI value for that location and period is zero due to increasingly severe rainfall deficits. The Standard Precipitation Index (SPI) is calculated using the following equation:
SPI=Pi -) P/σ) (Eq.1)
To achieve the goals of this research, 5 main draining springs were chosen in the Gareen Mountains, including Amir, Ahangaran, Chenareh, Laghary and Teymour Springs. After the survey of geomorphological, climatic, hydrodynamic, hydro chemical, physiographic properties and several field studies, the karstification degree in each aquifer was determined by using the hydrodynamic and hydro chemical properties.
In this study we used a mathematical formula to describe the falling limb of hydrographs and the base flow proposed by Maillet (1905) (Eq.2):
(Eq.2)
The dimensionless parameter α in Eq.1 is the coefficient of discharge (or recession coefficient) which depends on the aquifer’s transmissivity and specific yield, Qt is discharge in” t” time (m3/s), Q0 is beginning of discharge in t0, t is time elapsed between Qt, and Q0, e (mathematical constant) and α is the recession coefficient.
In addition, water samples in Karst springs in a period of 15 years (2001-2015) were used for hydro-chemical analysis. Hydro chemical analysis including total anions (HCO3, SO4 and Cl), Cations (Ca, Mg, Na, and K), Electrical conductivity (EC), Ca/Mg, total dissolved solids (TDS) and total hardness (TH) were used to determine the origin of the Karstic spring's water.
Results and Discussion
The calculation of α coefficient is one of the most important parameters in hydrogeological spring’s studies. Higher α coefficient represents springs much influenced by precipitation. This situation reflects the high porosity and high Karst development in the region. Conversely, the low α coefficient indicates the less karstification. Along with other factors, higher volume of dynamic storage in the basin of a spring indicates the high degree of karstification. In other words, less karst development leads to slow movement of water in the spring basin. This factor will increase the volume of dynamic storage. For identifying the karstification degree in the territory of the Gareen Mountains, we use the recession curve of spring's hydrographs and Malik and Vojtkova method.
Conclusion
According to the Hydrodynamic Study, Amir, and Chenareh springs have the karstification degree 2.7 and 2.5, respectively. Furthermore, the groundwater flow sub-regimes type is the combination of two or more sub-regimes with merely laminar flow characterized by different discharge. Ahangaran Spring has the karstification degree 4.3 and the discharge hydrogram is composed of a sub-regime with turbulent flow and a sub-regime with laminar flow. Laghari and Teymour springs have the karstification degree 5.5 and complex discharge regime, a combination of one sub-regime with turbulent flow and two sub-regimes with laminar groundwater flow. In other words, based on hydrodynamic results, Laghari and Teymour springs have the highest karstification degree in the Gareen Mountains. The results show that Amir and spring have the highest and Ahangaran and Laghari springs have the lowest volume of dynamic storage. According to the SPI method of years 84-88, the highest and most severe damage occurred within the scope of the study. Thus, during these years the springs of the study have dropped dramatically. The results of the comparison of SPI with discharge show that hydrological drought occurred due to the development of karst with different time delay has affected the spring’s aquifer. Thus, the fluctuations of precipitation with a shorter time lag appear in the aquifer of Ahangaran, Teymour and Laghari springs. However, in the aquifer of the Amir and Chenareh springs, due to the low karstification degree, the drought has been delayed for about 24 months .According to hydro chemical results, the highest and lowest total dissolved solids (TDS) values were found in the Chenareh and Ahangaran springs, respectively. Also, Ahangaran and Teymour springs have the highest and lowest t, otal hardness (TH) values respectively. Reducing precipitation and drainage have also led to an increase in TDS and TH in these springs.
Machine summary:
با توجه به توسعه متفاوت ژئومورفولوژی کارست میتوان گفت که در چشـمه های لاغری و تیمور به علت پایین بودن اثر حافظه و توسعه یافتگی آبخوان ، واکنش دبی به تغییرات بارشــی دارای تأخیر زمانی کوتاه مدت بوده اســت .
فیوریلو و همکاران (٢٠١٢) تغییرات سـری زمانی دبی چشـمه های جنوب ایتالیا را در ارتبـاط با رخداد خشـــکســـالی مورد ارزیابی قرار داده و نتیجه گرفته اند که به علت تأثیر حافظه آبخوان ، بین وقوع خشـکسـالی هیدرلوژیکی و هواشناسی در حوضه چشمه ها تأخیر زمانی وجود دارد.
(رجوع شود به تصوير صفحه)جدول ١- درجات خشکسالی بر مبنای روش SPI (مک کی و همکاران ١٩٩٣) {مراجعه شود به فایل جدول الحاقی} همچنین برای ارزیابی واکنش چشـمه های محدوده تاقدیس گرین به نوسانات بارشی، از دبی استاندارد چشمه های امیر، چناره ، آهنگران ، لاغری و تیمور در یک دوره زمانی ١٥ ســاله (١٣٩٤-١٣٨٠) از (معادله ٢) اســتفاده شــده اســت .
نتایج روش مالیک و وجکتوا در محدوده تاقدیس گرین نشـان داده اسـت که آبخوان چشـمه های امیر و چناره درجه توسعه یافتگی کارست در آن ها به ترتیب ٢/٧ و ٢/٥ بوده و دارای ســیســتم غالب جریان افشــان و زیر رژیم های خطی میباشــند.
در چشـمه تیمور به علت توسـعه یافته بودن سیستم کارستی و پایین بودن حجم ذخیره دینـامیـک (کمترین حجم در بین چشـــمه های مورد بررســـی محدوده تاقدیس گرین )، وقوع دوره های خشـکسـالی ٨٥-٣٨٤ و ٨٨-١٣٨٧ باعث شـده که دبی استاندارد این چشمه از سال ١٣٨٧ تا ١٣٩٤ پایین تر از میانگین اسـتاندارد (صـفر) قرار گیرد.