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Viru-Peipsi veemajanduskava - Keskkonnaministeerium

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3.3.3 <strong>Viru</strong> rannikumere ökoloogiline seisund<br />

71<br />

3.3.3 Ecological status of the coastal sea of <strong>Viru</strong> <strong>Peipsi</strong>...<br />

kvaliteediklassi (19 g/m 2 ). Viimast tulemust peavad<br />

toetama ka teised mõõtmised, sest väike<br />

biomass võib olla tingitud ka hapnikupuudusest<br />

või muust reostusest. Mediaankeskmine Narva-<br />

Jõesuu ja Sillamäe jaamade kohta kokku on 52 g/<br />

m 2 , mis endiselt viitab rahuldavale kvaliteediklassile.<br />

Kui aga võtta kogu piirkonna andmed kokku,<br />

siis saame tulemuseks 37 g/m 2 , mis jääb hea<br />

kvaliteediklassi piiresse. Põhjataimestiku seire<br />

andmetel Eru lahest kuulub see piirkond maksimaalse<br />

taimestiku sügavuslevikuga 12 m hea –<br />

väga hea kvaliteediklassi piirile (Soome lahe lääneosa<br />

rannikuvee tüübi puhul).<br />

Kokkuvõtteks võib olemasolevate andmete põhjal<br />

tõdeda, et <strong>Viru</strong> rannikumere ökoloogiline seisund<br />

on hea ja rahuldava piiril. Enamus hinnanguid annab<br />

tulemuseks hea kvaliteediklassi, rahuldavale<br />

seisundile viitavad Narva-Jõesuu ja Sillamäe piirkonna<br />

vee läbipaistvuse andmed 2001. aastast,<br />

lämmastikusisaldus 2002. aastast ja põhjaloomastiku<br />

biomass aastatest 2001–2003. Ülejäänud mereala<br />

kohta järelduste tegemiseks ei ole piisavalt<br />

andmeid. Rahuldavat seisundit ei saa välistada,<br />

kasvõi näiteks suure põhjaloomastiku biomassi tõttu<br />

Saka seirejaamast. VRD rakendamiseks kohustusliku<br />

rannikumere veekvaliteeti iseloomustava<br />

kaardimaterjali ettevalmistamiseks oleks otstarbekas<br />

teostada täiendavaid mõõdistusi teadaolevate<br />

koormusallikatega piirnevatel merealadel.<br />

µmol/l and 0.85 µmol/l) and the coastal waters<br />

near Saka, Purtse and Kunda belonged to the<br />

“good” ecological status class in 2001 (median<br />

concentration 0.70 µmol/l).<br />

A provisional assessment of ecological status according<br />

to zoobenthos can be made by summarising<br />

the data of three years for each station<br />

and finding the median mean biomass of<br />

Macoma balthica. Based on such analysis, the sea<br />

areas in the vicinity of monitoring stations would<br />

belong to the following ecological status classes:<br />

near Narva-Jõesuu – moderate (63 g/m 2 ), near<br />

Sillamäe – good (21 g/m 2 ), near Saka – moderate<br />

(70 g/m 2 ) and near Purtse – high (19 g/m 2 ). The<br />

latter result needs to be supported by other measurements<br />

because the low biomass may be connected<br />

also with oxygen deficiency or some other<br />

type of pollution. The median value for the stations<br />

of Narva-Jõesuu and Sillamäe together is 52<br />

g/m 2 , which refers to the moderate ecological status<br />

class. However, summary data for the entire<br />

region yield the median value of 37 g/m 2 , which<br />

falls within the good ecological status class. According<br />

to phytobenthos monitoring data from<br />

Eru Bay, this region with its 12-metre depth limit<br />

of phytobenthos lies on the border between the<br />

good and the high ecological status class (in the<br />

case of the coastal water type of the western part<br />

of the Gulf of Finland).<br />

In summary, the existing data suggest that the<br />

ecological status of coastal sea in the <strong>Viru</strong> region<br />

is on the border between good and moderate.<br />

Most of the assessments suggest the good ecological<br />

status class. Water transparency data from<br />

2001, nitrogen data from 2002 and data on the<br />

biomass of zoobenthos from 2001–2003 from the<br />

area of Narva-Jõesuu and Sillamäe refer to a<br />

moderate status. Data for drawing conclusions on<br />

the remaining sea areas are insufficient. Moderate<br />

status cannot be excluded there, for instance due<br />

to the high biomass of zoobenthos in the Saka<br />

monitoring station. For preparing the maps<br />

characterising the ecological status of coastal waters,<br />

as required for the implementation of the<br />

WFD, it would be practical to carry out additional<br />

measurements in sea areas adjacent to the<br />

known sources of pollution.

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