Waters of Montenegro
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1 WATERS OF MONTENEGRO Milan Bošković, Ivana Bajković Hydrometeorological Institute of Montenegro Podgorica, Serbia and Montenegro Abstract Natural resources of surface water in Montenegro (springs, brooks, rivers and lakes) are considerably bigger than the average surface fresh water of the former Yugoslavia, and many times bigger than the average of Europe or of the World. When we adopt as a criterion the specific module of surface runoff q [l·s-1·km-2] which in the World is only 7 l·s-1·km-2 and in the former Yugoslavia 16 l·s-1·km-2, the Montenegro with its 43 l·s-1·km-2 belongs to the most productive regions in the World, because only 3-4% of the total dry land has such or a higher specific runoff . The area of the mountainous territory of Montenegro (with the average level above the sea of 1050 m, and with the average slope of terrain around 30%) is 13.812 km2 (or with the adequate part of the sea atea 16.352 km2). On this territory are formed several main water courses which flow in two directions: toward the Black sea and the Adriatic sea. The considerable part of the area of Montenegro is on the region of the continental dinaric stone, which is without constant surface runoff, but with many crevices, depressions in karst and places where the flow sinks. Sinking waters flow under the surface toward the sea or to another flow outside the territory of Montenegro. The complex of Skadar lake, Drim and Bojana is by the hydrogeography extremely complicated, with the catchments area around 20000 km2. It is formed on the territory of Serbia, Macedonia, Greece, Albania and Montenegro and there is a large number of hydroenergetic power stations in this region. In this work is presented a global review of the available quantities of surface water in Montenegro, and its comparation with the waters of Serbia and Montenegro, the former Yugoslavia, Europe, and the whole Planet. Keywords: specific runoff module, catchments area, discharge, precipitation, transpiration Introduction Montenegrin natural resources in cultivated fields or mineral wealth is under the average of the former Yugoslavija. Instead of it, Montnegro as a whole, and especially its southern parth drained by the Adriatic sea, is one of the most productive regions in the World related to the waters. This fact is often not considered because of the uneven distribution of the precipitation, and then also runoff, in the year, and so of the often and long-term droughts |2|. According to statistics nowadays in the world every year five milions of people dies of thirst, and 1.5 mld. of them do not have sufficient drinking water. Because of the big demographic explosion, acording to some extimates could our planet in 2020 have more than 7 mld. inhabitants. Trying to supply all of them by the water, food, energy and environment will be dificult and, probably, neverending |2|. So that only a prompt and effective planning of using, distribution and protection of the water resources can give satisfying the water-needs with saving our environment. Of course, only with proper and in time given material investments. It is a known fact that the used and published runoff coeficients for all montenegrin rivers are too high. That signs that the brutto percipitations could be higher, that the catchment areas should be corrected or the discharges reduced. Depending of the catchment area we can hardly correct all of this three parameters. Sometimes the modification of only one of them could be sufficient, but "of which one?". Solving of this problem needs also including of experts from other research houses, and is enough for one good M. A. work. From the concept of Montenegro Space plan (Estimation of status and perspectives of development) we have extracted data for maps of hypsometry and slope of terrain, to be useful for analysis in future (tab.1 and tab.2). 2 Table 1. The evidence for the hypsometric map Hup Hto Hmidl Area Percentage Hmidl × Perc. [asl] [asl] [asl] [km2] [%] [asl] 0 200 100 1464.1 10.6 10.6 200 500 350 787.3 5.7 20.0 500 600 550 262.4 1.9 10.4 600 700 650 580.1 4.2 27.7 700 750 725 207.2 1.5 10.9 750 1000 875 2872.9 20.8 182.0 1000 1500 1250 5303.8 38.4 480.0 1500 1700 1600 1339.8 9.7 155.2 1700 2600 2150 994.4 7.2 154.8 ∑ = 13812.0 ∑ = 1051.6 Table 2. The evidence for the slope map Iup Ito Imidl Area Percentage Imid × Perc. [%] [%] [%] [km2] [%] [%] 0 10 5 5649.1 40.9 2.05 10 20 15 1464.1 10.6 1.59 20 30 25 1837 13.3 3.33 30 100 65 4861.8 35.2 22.88 ∑ = 13812 ∑ = 29.85 The tables unite a parcial characteristics available for some catchment areas. And also in table 6. are declared some more parameters of river basins upstream from HS for which is given the hydrological balance. Hydrography, land of Montenegro The area of Montenegro is 13812 km3 and with adequate part of Adriatic sea (2.540 km2) it is 16.352 km2. Waters of the dry land in Montenegro, generally, are drained into two catchment areas – of adriatic and black-sea. The total area of the black-sea catchment area is 7.545 km2 or 54.6% of the territory of Montenegro. This part is drained by the river Ibar and further by the Zapadna Morava and by the rivers Tara, Piva, Lim and Cehotina further by the Drina. 3 Figure 1. Montenegro - the black-sea and the Adriatic catchments area The Montenegro part of the adriatic catchment area is around 6560 km2 or 45.4% of the territory. The biggest water courses are the Zeta and the Moraca, or the Moraca after their confluence in Podgorica, and the Bojana as an international flow. The Skadar lake is the largest in Balkan, and by the volume of retained water the second after the Ohrid lake. The complex of Skadar lake, Drim and Bojana is by the hydrogeography extremly complicated, with the catchment area around 20000 km2. It is formed on the territory of Serbia, Macedonia, Greece, Albania and Montenegro and there is a large number of hydroenergetic power stations: Globočica and Špilje in Makedonia, Vaudeis, Fierza i Komana in Albania, and Perućica in Montenegro in it, with the total useful volume around 3.109 m3 of acumulated water. Besides Bojana also the Sutorina, Drenovštica, Lukavac, Građevica, Bečićka and Reževića river, Željeznica, Rikavac, Bratica, Brdela, and Međureč emjpty immediately to the Adriatic sea. Many people don`t know that the Bojana river is, related to quantity of water, the forth water course between the biggest rivers in the former Yugoslavia – after the Danube, the Sava and Tisa, and before the Drava, Drina and Neretva. And in the territory of the former Yugoslavia there are only ten rivers richer in water than the Morača in the mouth to Skadar lake. Let us show some basic quantitative parameters for the most rich and known rivers in Montenegro. Table 3. Basic quantitative parameters Specif. runoff Average Water Catchments Course Average module Profile year prec course area length. discharge upper lower sum course course - - 2 3 [l.s [l.s [km ] [km] [m /s] [mm] 1.km-2] 1.km-2] Zeta mouth 1597 85 100 65.8 62.6 2376 Morača mouth 3270 102 202 70.9 61.8 2232 Piva mouth 1784 94 75.0 53.7 42.0 1837 Tara mouth 2040 147 77.5 56.3 38.0 1628 Ćehot. Gradac 810 77 12.5 20.5 15.4 930 Lim Dobrak. 2805 123 71.0 52.3 25.3 1235 Ibar Bać 405 34 6.0 25.5 14.8 982 4 All of the montenegrin rivers are hydrograpically well-built, especially in their upper courses. Considering by river basins, the most complex is the basin of the Lim river, and the less complicated is basin of the Ćehotina. Because in Montenegro there is a lot of karst terrains (especially in the coast and in the central region), we can find there also many structures related to surface and groundwaters |1|. This large number of hydrographic structures is the result of geology, structure of the rock and of the big volume of precipitation falling in this region where stand face to face two climats: the milder mediteranian and the sharper continental. For example in the region from Cetinje to the northwest toward Crkvice there are locations with the highest precipitations in Europe (Cetinje with average annual sum of perc. 3230 mm and Crkvice with 4600 mm). Precipitations 2500 – 3000 mm per year are present in upper courses of Zeta, Morača, Piva, Tara and also the Lim. The average percipitations for the catchment areas are in interval from 1200 mm (Lim) until 2400 (Zeta and Morača). Let's remind that the annual volume of perciitation in many regions of Povardarje, Pomoravlje, Šumadija and Vojvodina only 650 – 750 mm. This qantity falled in Cetinje in 5 days of its famous flood, in february 1986 |1|. Basins with the least water content in Montenegro are Ćehotina and Ibar basins, with average annual precipitation volume of 900 to 1000 mm, and according to that and with lower specific runoff modul which are, however, around the Yugoslavia average, so that cannot be underestimated. Thi high precipitation concentrations, especially in higher source parts have and expresive inequality and there arise the problems with inequal flow in all basins of mentioned rivers.