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Environmental Sciences
Sri Lanka
2026

D-Index & Metrics

Environmental Sciences

D-Index
63
Citations
15408
World Ranking
2463
National Ranking
3

Pay Drechsel publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Pay Drechsel sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 282 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 26 scientists 501–510 publications: 17 scientists 511–520 publications: 19 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–689 publications: 4 scientists 690+ publications: 100 scientists
41 publications 690+

This scientist: 260 publications — 80th percentile

80% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 690 publications or more.

Pay Drechsel D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where Pay Drechsel sits on this spectrum.

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 198 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 20 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125 D-Index: 9 scientists 126+ D-Index: 92 scientists
30 D-Index 126+

This scientist: 63 D-Index — 75th percentile

75% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 126 D-Index or more.

Research.com Recognitions

  • 2026 - Research.com Environmental Sciences in Sri Lanka Leader Award
  • 2025 - Research.com Environmental Sciences in Sri Lanka Leader Award
  • 2023 - Research.com Environmental Sciences in Sri Lanka Leader Award
  • 2022 - Research.com Environmental Sciences in Sri Lanka Leader Award

Overview

Pay Drechsel is affiliated with the International Water Management Institute in Sri Lanka. Their research primarily focuses on environmental science and agricultural and biological sciences, with contributions spanning several interrelated subfields such as industrial and manufacturing engineering, water science and technology, food science, nutrition and dietetics, and plant science.

Their work addresses a wide range of topics, including:

  • Wastewater treatment and reuse
  • Child nutrition and water access
  • Food waste reduction and sustainability
  • Water-energy-food nexus studies
  • Urban agriculture and sustainability
  • Municipal solid waste management
  • Healthcare and environmental waste management

Pay Drechsel has authored several papers published in various journals, illustrating a focus on water management and sustainability. Notable recent publications include:

  • "Global and regional potential of wastewater as a water, nutrient and energy source," 2020, Natural Resources Forum
  • "Urbanisation and emerging economies: Issues and potential solutions for water and food security," 2020, The Science of The Total Environment
  • "The WHO Guidelines for Safe Wastewater Use in Agriculture: A Review of Implementation Challenges and Possible Solutions in the Global South," 2022, Water
  • "Water reuse to free up freshwater for higher-value use and increase climate resilience and water productivity," 2022, Irrigation and Drainage
  • "Perceptions of Food Waste Reduction in Sri Lanka's Commercial Capital, Colombo," 2021, Sustainability

Their frequent co-authors include:

  • Manzoor Qadir
  • Hanna Karg
  • Edmund Kyei Akoto-Danso
  • Louis Amprako
  • Andreas Buerkert

Their research has been disseminated through various publication venues, with a notable presence in:

  • Zenodo (CERN European Organization for Nuclear Research)
  • Frontiers in Sustainable Food Systems
  • Journal of Water Sanitation and Hygiene for Development
  • Natural Resources Forum
  • The Science of The Total Environment

Best Publications

  • Economics of salt-induced land degradation and restoration

    Manzoor Qadir;Emmanuelle Quillérou;Vinay Nangia;Ghulam Murtaza

  • The challenges of wastewater irrigation in developing countries

    Manzoor Qadir;Manzoor Qadir;Dennis Wichelns;Liqa Raschid-Sally;Peter G. McCornick;Peter G. McCornick

  • Total Value of Phosphorus Recovery

    Brooke K. Mayer;Lawrence A. Baker;Treavor H. Boyer;Pay Drechsel

  • Farmer perceptions and pesticide use practices in vegetable production in Ghana.

    William J Ntow;Huub J Gijzen;Peter Kelderman;Pay Drechsel

  • Global and regional potential of wastewater as a water, nutrient and energy source

    Manzoor Qadir;Pay Drechsel;Blanca Jiménez Cisneros;Younggy Kim

  • Pesticide and pathogen contamination of vegetables in Ghana's urban markets.

    Philip Amoah;Pay Drechsel;R.C. Abaidoo;W.J. Ntow

  • Population density, soil nutrient depletion, and economic growth in sub-Saharan Africa

    Pay Drechsel;Lucy Gyiele;Dagmar Kunze;Olufunke Cofie

  • Global assessment of urban and peri-urban agriculture: irrigated and rainfed croplands

    A.L. Thebo;Pay Drechsel;E.F. Lambin;E.F. Lambin

  • Irrigated urban vegetable production in Ghana: characteristics, benefits and risks.

    Emmanuel Obuobie;Bernard N. Keraita;George K. Danso;Philip Amoah

  • Wastewater irrigation and health: assessing and mitigating risk in low-income countries

    Christopher A. Scott;Pay Drechsel;Liqa Raschid-Sally;Akissa Bahri

  • Informal irrigation in urban West Africa: An overview

    Pay Drechsel;S. Graefe;M. Sonou;Olufunke Cofie

  • Irrigated urban vegetable production in Ghana: microbiological contamination in farms and markets and associated consumer risk groups.

    P. Amoah;P. Drechsel;M. Henseler;R. C. Abaidoo

  • Does irrigated urban agriculture influence the transmission of malaria in the city of Kumasi, Ghana?

    Yaw Asare Afrane;Eveline Klinkenberg;Pay Drechsel;Kofi Owusu-Daaku

  • Urbanisation and emerging economies: Issues and potential solutions for water and food security.

    Rai S. Kookana;Rai S. Kookana;Pay Drechsel;Priyanka Jamwal;Joanne Vanderzalm

  • A global, spatially-explicit assessment of irrigated croplands influenced by urban wastewater flows

    Anne Louise Thebo;Pay Drechsel;Eric Lambin;Eric Lambin;Kara Nelson

  • Dynamics and sustainability of urban agriculture: examples from sub-Saharan Africa

    Pay Drechsel;Stefan Dongus;Stefan Dongus

  • Irrigated urban vegetable production in Ghana : Sources of pathogen contamination and health risk elimination

    Philip Amoah;Pay Drechsel;R.C. Abaidoo

  • Heavy metal accumulation and health risk assessment in wastewater-irrigated urban vegetable farming sites of Addis Ababa, Ethiopia

    Desta Woldetsadik;Pay Drechsel;Bernard Keraita;Fisseha Itanna

  • Foliar nutrient levels of broad-leaved tropical trees: A tabular review

    Pay Drechsel;Wolfgang Zech

  • Managing water and fertilizer for sustainable agricultural intensification

    Pay Drechsel;P. Heffer;H. Magen;R. Mikkelsen

  • The use of human waste for peri-urban agriculture in Northern Ghana

    Olufunke O. Cofie;Gordana Kranjac-Berisavljevic;Pay Drechsel

  • Influence of Urban Wastewater on Stream Water Quality and Agriculture in and Around Kumasi, Ghana

    Bernard Keraita;Pay Drechsel;Philip Amoah

Frequent Co-Authors

Manzoor Qadir
Manzoor Qadir McMaster University
Robert C. Abaidoo
Robert C. Abaidoo Kwame Nkrumah University of Science and Technology
Flemming Konradsen
Flemming Konradsen University of Copenhagen
Christopher A. Scott
Christopher A. Scott University of Arizona
Wolfgang Zech
Wolfgang Zech University of Bayreuth
Duncan Mara
Duncan Mara University of Leeds
Andreas Buerkert
Andreas Buerkert University of Kassel
Bernd Marschner
Bernd Marschner Ruhr University Bochum
Huub J. Gijzen
Huub J. Gijzen IHE Delft Institute for Water Education
Jeffrey T. LeJeune
Jeffrey T. LeJeune The Ohio State University

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