lakes and rivers

... demand curve reflects visitor i’s WTP for improved aesthetic quality. WTP for improved aesthetic quality is calculated as Aesthetic Values of Lakes and Rivers Jay R. Corrigan Department of ... infer the value placed on the aesthetic quality of public goods. Another related good used to reveal values of aesthetic quality is the value of homes near lakes...

Ngày tải lên: 07/03/2014, 12:20

... deep and 3.4 km in diameter, hosting a lake presently 267 m 28 POLAR LAKES AND RIVERS number of lakes in the polar and temperate regions of the world. The irregularity of residual land- scapes ... Arctic north of the tree line (tundra or polar desert catchments), the Antarctic continent, and the Antarctic Peninsula region, with occasional reference to the...

Ngày tải lên: 29/03/2014, 17:20

... percentage of cultivated area Benthic algae as bioindicators of agricultural pollution in the streams and rivers of southern Que´bec (Canada) Isabelle Lavoie, 1 , 2 ∗ Warwick F. Vincent, 1 , 2 ... intensity and type of farming activity in the surrounding watershed. We evaluated this hy- pothesis by examining the colonisation of ceramic s...

Ngày tải lên: 28/07/2014, 17:21

... 0 Missouri 11 8,254 11 8,254 99 — < ;1 1 — Montana 3 41, 189 322,622 14 — 86 1 — Nebraska 11 3, 316 49,262 68 13 19 < ;1 — Nevada 215 , 818 85,932 74 — 8 18 — N. Hampshire 68,8 02 65,344 97 — 2 1 0 N. ... America on acid-free paper 10 9876543 21 International Standard Book Number -1 0 : 1- 5 667 0-6 2 5-4 (Hardcover) International Standard Book Number -1 3 : 97 8 -1...

Ngày tải lên: 11/08/2014, 15:20

... 17 16 17 17 16 41 17 16 43 42 46 48 49 51 50 52 53 56 55 70 67 64 60 61 58 58 59 69 71 63 62 67 72 68 65 75 76 65 66 61 57 50 57 45 11 12 13 19 20 19 8 8 18 25 27 44 21 26 14 23 23 22 23 23 24 25 26 30 31 32 33 35 74 36 39 40 54 47 37 38 28 32 29 27 34 23 5 3 4 6 6 6 7 9 17 63 Copyright â 20 05 by Taylor & Francis ... Petersen, and P.R. Newroth. 19...

Ngày tải lên: 11/08/2014, 15:20

... Variability of trophic state indicators in reservoirs. In: Restoration of Lakes and Reservoirs. USEPA 440/ 5-8 1-0 10. p. 34 4. Copyright â 2005 by Taylor & Francis Nürnberg, G.K. 1987. A comparison of ... Puckso and M. Sager. 1988. Fractionation of phosphorus in suspended matter and sediment. Arch. Hydrobiol. Suppl. 30 : 98–1 03. Rast, W. and M. Holland. 198...

Ngày tải lên: 11/08/2014, 15:20

... and increasing urban runoff. Water Res. 14: 821–828. Welch, E.B., K.L. Carlson and M.V. Brenner. 19 84. Control of algal biomass by inflow nitrogen. In: Lake Reservoir Management. USEPA -4 4 0/ 5-8 4- 0 01. ... 1993. Restoration and Management of lakes and Reservoirs, 2nd ed. CRC Press, Boca Raton, FL. Cullen, P. and C. Forsberg. 1988. Experiences with reducing point...

Ngày tải lên: 11/08/2014, 15:20

... 2. 45 m 3 Retention time: 2. 15 minutes minimum G-values 50 -s −1 G-t 20000 50 000 6 pumps of 6-3 000 m 3 /h 30 cm activated carbon 1 25 cm hydro anthracite 50 cm quartz sand Effluent 3 5 mm 1 .5 2 .5 ... Soil Water Conserv. 58 : 98–1 05. Benndorf, J. and K. Putz. 1987a. Control of eutrophication of lakes and reservoirs by means of pre-dams. I. Mode of operation...

Ngày tải lên: 11/08/2014, 15:20

... Horn 1 969 –1970 1 .6 152 28 71 0 .6 1977–1979 7.8 68 15 26 1.3 19 86 1988 8.0 47 6 21 1.5 South Lake 1 969 –1970 1.1 1 56 48 42 1.0 1977–1979 3.5 86 35 21 1.7 19 86 1988 3 .6 41 7 12 1.7 Pelican Horn 1 969 –1970 ... Phosphorus Study. Pub. No. 0 4-0 3-0 , WA Dept. of Ecology, Olympia, WA. Cooke, G.D., E.B. Welch, S.A. Peterson and P.R. Newroth. 1993. Restoration and Mana...

Ngày tải lên: 11/08/2014, 15:20

... from the hypolimnion of the 1.5-ha lake. Epilimnetic TP decreased from annual means of 38 and 43 μg/L in 1 974 and 1 975 to 21 μg/L in 1 977 . Transparency nearly doubled over the 4-year period following ... 855–861. Olszewski, P. 1 973 . Funfzehn Jahre Experiment auf den kortowo-See. Verh. Int. Vere in. Limnol. 18: 179 2– 179 7. Pechlaner, R. 1 975 . Eutrophication and restoration...

Ngày tải lên: 11/08/2014, 15:20

... Verh. Int. Verein. Limnol. 25.With permission.) TP (μg/L) 100 90 80 70 60 50 40 30 20 10 92 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 Year Drawdown Harvest (10%) Harvest (43%) Harvest (69%) Alum Copyright ... sulfate. e Aluminum sulfate and sodium aluminate. Source: Data from Cooke, G.D. and R.H. Kennedy. 1 981 . Precipitation and Inactiva- tion of Phosphorus as...

Ngày tải lên: 11/08/2014, 15:20

... pre-biomanipulation years ( 197 7– 198 0) were compared with the biomanipulation period ( 198 0– 198 8) (Benndorf, 198 7, 198 8, 198 9, 199 0; Benndorf and Miersch, 199 1; Benndorf et al., 198 4, 198 8, 198 9, 2002). Planktivores ... Limnol. Oceanogr. 29: 472486. Copyright â 2005 by Taylor & Francis ( 199 6a), Hosper ( 199 7), Jeppesen ( 199 8), McQueen ( 199 8), Bergman et al. ( 199...

Ngày tải lên: 11/08/2014, 15:20

... Sabine Beaupré Illustrations by Stefan Chabluk Originated by Discovery Books Composition by Discovery Books Cover printed by Bang Printing, Brainerd, MN Book printed and bound by Bang Printing, ... gives diatoms their shimmering appearance. Diatoms are microscopic algae found in oceans and in freshwater (the water found in rivers and most lakes and ponds) . 14 15 Mi...

Ngày tải lên: 31/10/2014, 14:30

... life, and the hydrologic cycle 25 CHAPTER 2 PHYSICAL GEOGRAPHY OF LAKES AND RIVERS 26 The creation of lakes 26 The properties of lakes 28 Saline lakes 29 Lakes through time 31 The creation of rivers ... geography of lakes and rivers. It considers how these freshwater systems were creat- ed, how lakes come to lie in landscapes and how rivers move through them, and...

Ngày tải lên: 14/11/2014, 06:42

... Platte River. Each spring, water Defining Rivers, Streams, Lakes, and Ponds 1 Defining Rivers, Streams, Lakes, and Ponds 4 [Chapter One] moves across the land, renew- ing waterways. Fresh, flowing ... Asian river, begins in China, and flows through Thailand, Laos, Kampuchea, and Vietnam. India’s main rivers include the Brahmaputra and the 16 [Defining Rivers, Str...

Ngày tải lên: 15/01/2015, 14:21