CHARACTERISTIC FEATURES OF WATER YEAR 2002 FOR GROUNDWATER IN BULGARIA

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1 5 years University of Mining and Geology St. Ivan Rilski Annual, vol. 46, part І, Geology and Geophysics, Sofia, 23, рр CHARACTERISTIC FEATURES OF WATER YEAR 22 FOR GROUNDWATER IN BULGARIA Tatiana Orehova 1, Teodossia Andreeva 2 1 National Institute of Meteorology and Hydrology, Departent of Hydrology, Sofia 1784, 66, Tzarigradso shaussee, Bulgaria, E-ail: Tatiana.Orehova@eteo.bg 2 National Institute of Meteorology and Hydrology, Departent of Forecast, Sofia 1784, 66, Tzarigradso shaussee, Bulgaria, E-ail: Teodosia.Andreeva@eteo.bg ABSTRACT The purpose of the present contribution is to clarify the ipact of the teperature and precipitation anoalies during the Water Year 22 on the groundwater regie in Bulgaria. The analysis is based on data fro National Hydrogeological Network: spring discharges and water levels for observational wells. Mean onthly teperatures and onthly precipitation values originate fro synoptic stations in Bulgaria. The period Noveber 21 February 22 is characterised with precipitation sus below noral. As a result very low spring discharges and groundwater levels were registered. Heavy rainfalls in March in cobination with snowelt caused very high springflows. Then priary axius for karstic springs in ost regions of the country were observed. The suer 22 was very wet. During Septeber and October the precipitation sus were above noral. The secondary axius for springs were registered in October or August. INTRODUCTION The proble of water resources in Bulgaria is of coon interest, especially after the drought period Gerassiov et al. (21) analysed the ipact of this drought period on water resources in Bulgaria. The behaviour of the groundwater was analysed as well (Bojilova et al., 2; Orehova et al., 21 and 21a; Andreeva et al., 21). A coparison between Water Years (WY) 2 and 21 for groundwater in Bulgaria was ade by Orehova (22a). Suer droughts 2 and 21 caused reduction of spring discharges. Extreely dry beginning of the WY 21 had strong negative ipact on groundwater as well. The end of the Water Year 21 was very dry. The ai of the present study is to characterize the general behaviour of the groundwater regie in Bulgaria during the Water Year 22. The influence of the dry and wet periods on the regie of selected karstic springs and observational wells was estiated. For this reason the variations in the groundwater tie series were studied in relation to the previous observational period. In Bulgaria the beginning of Water (Hydrological) year is accepted on the 1st Noveber of the previous calendar year. It lasts exactly 12 onths. INFORMATION DATA BASE Data fro National Meteorological and Hydrogeological Networks located in the National Institute of Meteorology and Hydrology were processed. For this study, tie-series of precipitation, air teperature, discharge for karstic springs and water level for observational wells were utilized. The hydrogeological stations with long period of observation and inial huan ipact were selected. Tie series fro National hydrogeological network that starts fro were used. They are spring discharges and water levels for the observation wells. For the chosen springs the easureents are ade usually fro 12 to 24 annually (once-twice in a onth). For soe springs the daily data are obtained using rating curves. Water level in observational wells is easured usually once in a onth. Soe of the stations are observed several ties onthly. Water level recorders are available only for sall nuber of the stations. For the purpose of this study, soe representative springs were chosen related to elevated assifs of Mesozoic liestone and Proterozoic arbles (Antonov et al., 198; Boyadjiev, 1964). The selected wells refer to porous aquifers in alluvial and proluvial deposits. The variations of spring discharges and ground water levels during the Water Year 22 were estiated expressed in relation to the periods. ANALYSIS OF THE PRECIPITATION AND THE TEMPERA- TURE ANOMALIES The Water Year 22 started in Noveber 21 with lower rainfall aounts relative to noral in ost regions of Bulgaria. The tendency continued during the next onth Deceber. The teperature anoalies were below noral alost everywhere during this period. The two winter onths January and February were war. February was extreely war with the anoalies 6-7 C above noral. The rainfall totals were below noral everywhere with soe exceptionally heavy daily falls bringing totals between ½ and ¾ to the onth noral. For all 275

2 period Noveber 21 February 22 the rainfall aounts were below noral. Rainfall during the spring was about noral in ore regions and above noral in Northeast Bulgaria. The wettest onth on record in ost places was March. The suer was very wet. The wettest onth was July with rainfall aounts between two and three ties above noral. Septeber was cool and wet everywhere. The rainfall aounts were up to five ties the onth noral at the Black Sea region. Septeber 22 was extreely wet. The tendency was preserved during the second autun onth, October. For all period Noveber 21 October 22 the rainfall aounts were about and above noral. characterized on the base of water levels in observational wells (see Table 2). The deviations for water levels are given in absolute values in respect fro their ultiannual values for the cliatic period Table 2. Deviations of the ean yearly water levels in wells for the Water Years WR, river basin Well N Village 2, 21, 22, 17, Scat 442 B.Slatina , Maritza 28a Rakovski , Maritza 266 V.Levski ,41 73, Maritza 526 Trakia , Maritza 287a Sabrano ,82 74, Tundja 271 Tulovo BASIC FEATURES OF THE GROUNDWATER REGIME To reveal anoalies of the groundwater regie during the Water Year 22, the basic features of it are presented. The natural groundwater regie in Bulgaria is described here for soe coon cases of karstic and porous aquifers. Mean yearly values for the Water Year 22 In this section, average values of spring discharges and water level for observational wells are presented. The groundwater regie during the Water Year 22 is executed in deviations for soe representative karstic springs (see Table 1). Table 1. Deviations of the ean yearly spring discharge for the Water Years WR, river basin Spr. N Village the North Bulgaria 18, Iskar 25 Zl.Panega , Jantra 396 Musina ,Kachia 48 Kotel , Dobr.r. 13 Voden the Upper Strua basin 51, Strua 86 P.Skakav , Strua 4 Drugan the ountain Pirin 52, Mesta 59a Razlog the ountain Rhodopes 72, Maritza 39a Beden the Southeast Bulgaria 83, Veleka 63 M.Tarnovo The deviations of ean yearly values for spring discharges were calculated in respect fro their ultiannual values by Q ε = 1 1% (1) Q N where N refers to the period This period was chosen taking into account the recoendation of WMO for defining of norals (WMO, 1984). For the Upper Tracian Kettle in the Maritza watershed, the regie of the groundwater during Water Years 2-22 is The nuber of the water region (WR) is indicated in the beginning of the first colun in Tables 1-2. It refers to the watershed of one river or to part of the watershed for larger river body (i.e. Maritza). The analysis shows the reduction of spring flow and falling of water levels for ost of stations for the years In average, the decrease for the Water Year 21 was stronger - about 42% for spring flow copared to 24% and 34% for the Water Years 2 and 22 respectively. Low values of spring discharge and water levels were typical for the year 21 due to extreely dry beginning of the Water Year and dry suer Spring 396 Spring Figure 1. Discharge of springs 341and 63 in relative deviations The chronological structure for two karstic springs is presented in Figure 1. The deviations here are diensionless and are calculated using annual discharges: Q Q ψ = (2) σ Q where Q, are average values and standard deviations σ Q for the period respectively. Low values of spring discharges for years 2-22 are evident. 276

3 Interannual regie for karstic springs The predoinance of drought during the first 4-onth period of the WY 22 resulted in very low spring discharges. An additional reason for this was extreely dry October 21 that finished the previous WY 21 (Orehova, 22a). Heavy rainfalls in March in cobination with snowelt caused floods in rivers and increased discharges of karstic springs especially in Northern Bulgaria. The priary axius for the rivers and springs were observed in the country in March - April. The wet period July-October caused high springflows and water levels. Then secondary axius were observed. Soe exaples of the interannual regie for karstic springs fro the North and Southeast Bulgaria are presented in Figures 2-5. Due to predoinance of drought during the first 4- onth period of the WY 22, very low discharges and levels were registered. The priary axiu was registered during March or April and the secondary one in October or August WY 22 Spring Spring 48 WY Figure 4. Regie of spring 48 in the North Bulgaria. Regie of springs in ountainous regions The karstic springs with watersheds in high ountains Pirin and Rhodopes are characterized with specific regie. Their axial springflows are observed later due to later snowelt. During the first half-year period of WY 22 extreely low discharges were registered, whereas in Septeber and October the values about or above their ulti-annual nors were observed (Fig. 6-7}. The axial onthly discharge for spring 59a was registered as usual in June, and for spring Beden 39a in April. The drainage basin of the spring 59a is located in preserved area of Pirin ountain. Pirin ountain is included in the list of United Nations Organization as a part of World natural heritage Figure 2. Regie of spring 25 in the North Bulgaria. Spring Spring 63 WY 22 9 WY Figure 3. Regie of spring 396 in the North Bulgaria Figure 5. Regie of spring 63 in the Southeast Bulgaria. Regie of water levels in porous aquifers Aquifers in porous edia in alluvial and proluvial deposits do not show quick reaction to the precipitation occurrence as karstic springs. They however are sensible to droughts or wet periods. The drought during the first several onths of the WY 22 caused falling of water tables (Figures 8-9). 277

4 12 Spring 59a Well WY 22 Water level, c Hav WY Figure 6. Regie of spring 59a in the ountain Pirin fro the Southwest Bulgaria. Figure 8. Regie of observational well 266 in the Upper Tracian Kettle Spring 39a WY 22 Well 287a Hav 7 35 Water level, c 15 3 WY Figure 7. Regie of spring 39a in the ountain Rhodopes fro the South Bulgaria. March was very wet onth, and precipitation together with snowelt contributed to effective recharge of porous aquifers. The highest water levels however were observed later during April. Precipitation aounts during suer were used to evapotranspiration by plants, and regardless of very wet suer they did not contribute to iportant recharge of groundwater. Minial water levels were registered in July or in the beginning of the WY 22 in Noveber-Deceber. Septeber 22 was extreely wet, followed by wet October. The autun precipitation contributed to recharge of porous aquifers in the country. CONCLUSION Long lasting drought during Noveber 21 February 22 caused low values for spring discharges and water levels in wells during Water Year Figure 9. Regie of observational well 287a in the Upper Tracian Kettle. The reduction of the precipitation during the winter (Deceber, January and February) had strong negative ipact on groundwater regie in WY 22. The last winter onth February - extreely war, had negative ipact on the rainfall aount and on the springflows and water levels. The first spring onth March was the wettest onth on record and caused the highest discharges for springs in the country. The secondary axiu for springs and wells were observed during October. Precipitation aounts about and above noral during autun had positive influence on the groundwater recharge. REFERENCES Andreeva, T., Orehova, T. 21. Cliate variability and its influence on groundwater in Central Bulgaria during the last decades. Coptes rendus de l'acadéie bulgare des Sciences, 54(11), Antonov H., Danchev, D Groundwater in the Republic Bulgaria. Sofia, Technika, 36 p. (in Bulgarian). Bojilova, E., T.Orehova, 2. Influence of drought period of to the groundwater regie in the Danube hydrological zone, XX Conference of the Danube countries, 4-8 Septeber, Bratislava, Slovak Republic. 278

5 Boyadjiev N., The karst basins in Bulgaria and their groundwaters, Bulletin of the Institute of Hydrology and Meteorology, 1964, Vol. II, (in Bulgarian). Gerassiov, S., Guenev, M., Bojilova, E., Orehova, T. 21. Water resources in Bulgaria during the drought period - quantitative investigations. 29th IAHR Congress Proceedings. Thee A Developent, Planning and Manageent of Surface and Ground Water Resources. Tsinghua University Press, Beijing, China, Orehova T. 22a. A coparison between water years 2 and 21 for groundwater in Bulgaria. Proceedings of the 22-nd Annual AGY Hydrology Days Colorado State University. Fort Collins. CO. pp Orehova, T., Bojilova, E. 21. Soe investigations concerning groundwater regie in the Mediterranean and Black Sea zones in Bulgaria. 3rd Int. Conf. Future Groundwater Resources at Risk, Lisbon, Portugal. Orehova, T., Bojilova, E. 21a. Ipact of the recent drought period on groundwater in Bulgaria. 29th IAHR Congress Proceedings. Thee A Developent, Planning and Manageent of Surface and Ground Water Resources. Tsinghua University Press, Beijing, China, 1-6. World Meteorological Organization (WMO), Technical Regulations. Basic Docuents No.2, Vol. 1 - General Meteorological Standards and Recoended Practices. WMO No. 49, WMO, Geneva, Switzerland, Recoended for publication by Departent of Hydrogeology and Engineering Geology, Faculty of Geology 279

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