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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Environmental Sciences 75 1276 1209 19 19 616 20598

Nadhir Al-Ansari publications per year

The chart shows the history of publications by Nadhir Al-Ansari between 1980 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Nadhir Al-Ansari published across 47 years, from 1980 to 2026, averaging 18.4 papers a year. Output peaked at 149 publications in 2020. 24 of the 864 publications appeared in the last two years.

No. of publications
25 50 75 100 125
Bar chart. Horizontal axis: year, 1980 to 2026. Vertical axis: number of publications, 0 to 149. Peak 149 publications in 2020. 1980: 1 publication 1981: 0 publications 1982: 0 publications 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 0 publications 1987: 0 publications 1988: 1 publication 1989: 0 publications 1990: 0 publications 1991: 0 publications 1992: 0 publications 1993: 0 publications 1994: 0 publications 1995: 0 publications 1996: 0 publications 1997: 0 publications 1998: 0 publications 1999: 0 publications 2000: 0 publications 2001: 1 publication 2002: 0 publications 2003: 0 publications 2004: 0 publications 2005: 2 publications 2006: 0 publications 2007: 0 publications 2008: 0 publications 2009: 0 publications 2010: 0 publications 2011: 10 publications 2012: 21 publications 2013: 34 publications 2014: 37 publications 2015: 28 publications 2016: 48 publications 2017: 30 publications 2018: 45 publications 2019: 65 publications 2020: 149 publications 2021: 91 publications 2022: 117 publications 2023: 115 publications 2024: 45 publications 2025: 23 publications 2026: 1 publication
1980 2026

864 publications in total across all disciplines

View publications per year as a table
Nadhir Al-Ansari: publications per year, 1980 to 2026
Year Publications
1980 1
1981 0
1982 0
1983 0
1984 0
1985 0
1986 0
1987 0
1988 1
1989 0
1990 0
1991 0
1992 0
1993 0
1994 0
1995 0
1996 0
1997 0
1998 0
1999 0
2000 0
2001 1
2002 0
2003 0
2004 0
2005 2
2006 0
2007 0
2008 0
2009 0
2010 0
2011 10
2012 21
2013 34
2014 37
2015 28
2016 48
2017 30
2018 45
2019 65
2020 149
2021 91
2022 117
2023 115
2024 45
2025 23
2026 1
Total 864
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Nadhir Al-Ansari publications per year - data summary

  • Nadhir Al-Ansari, a Environmental Sciences scholar from Luleå University of Technology, has 864 publications recorded across 47 years, from 1980 to 2026.
  • The oldest publication on record dates to 1980 and the most recent to 2026.
  • The most productive year is 2020, with 149 publications.
  • The least productive years with any output are 1980, 1988, 2001 and 2026, with 1 publication each.
  • 27 of the 47 years in the span carry no publications at all (1981, 1982, 1983, 1984 and others).
  • The rate of publication averages 18.4 papers per year over the whole span, or 43.2 per year counting only the 20 years with at least one publication.
  • The last 5 years on the chart (2022-2026) hold 301 publications, 35% of the career total.
  • Split into equal eras - 1980-1995: 2 publications (0.1 per year); 1996-2011: 13 publications (0.8 per year); 2012-2026: 849 publications (56.6 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Nadhir Al-Ansari 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 Nadhir Al-Ansari sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 66 bars. Horizontal axis: publications, 41–50 to 690+. Vertical axis: number of scientists, 0 to 617. Most scientists, 617, have 121–130 publications. The last bar groups every scientist with 690 publications or more. The highlighted bar, 611–620 publications, is where this scientist sits. 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
41–50 publications 690+

This scientist: 616 publications — 99th percentile

99% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Environmental Sciences scientists by publication count, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
Publications Scientists This scientist
41–50 21
51–60 62
61–70 133
71–80 257
81–90 361
91–100 440
101–110 492
111–120 541
121–130 617
131–140 544
141–150 541
151–160 539
161–170 444
171–180 444
181–190 400
191–200 377
201–210 318
211–220 282
221–230 263
231–240 220
241–250 217
251–260 180
261–270 181
271–280 155
281–290 130
291–300 127
301–310 130
311–320 85
321–330 106
331–340 80
341–350 83
351–360 75
361–370 69
371–380 52
381–390 54
391–400 56
401–410 44
411–420 40
421–430 36
431–440 25
441–450 25
451–460 32
461–470 29
471–480 21
481–490 26
491–500 26
501–510 17
511–520 19
521–530 15
531–540 22
541–550 12
551–560 15
561–570 11
571–580 19
581–590 9
591–600 9
601–610 7
611–620 11 616
621–630 5
631–640 5
641–650 6
651–660 3
661–670 3
671–680 4
681–689 4
690+ 100
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Nadhir Al-Ansari publication distribution in Environmental Sciences in 2026 - data summary

  • The chart plots the publication count of all 9,676 Environmental Sciences scientists ranked by Research.com in 2026, grouped into 66 ranges running from 41–50 to 690+ publications.
  • Nadhir Al-Ansari, a Environmental Sciences scholar from Luleå University of Technology, records 616 publications - the 99th percentile of the discipline.
  • 99% of ranked Environmental Sciences scientists score the same or lower than Nadhir Al-Ansari, and about 1% score higher.
  • The median of the discipline falls in the 161–170 publications range, and Nadhir Al-Ansari ranks above the median.
  • The most crowded range is 121–130 publications, holding 617 scientists (6% of the field).
  • 67% of the field sits in the lowest quarter of the value range (up to 201–210 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 690 publications or more, 100 scientists in all (1% of the field).

Nadhir Al-Ansari 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 Nadhir Al-Ansari sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 97 bars. Horizontal axis: D-Index, 30 to 126+. Vertical axis: number of scientists, 0 to 348. Most scientists, 348, have 45 D-Index. The last bar groups every scientist with 126 D-Index or more. The highlighted bar, 75 D-Index, is where this scientist sits. 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: 75 D-Index — 87th percentile

87% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Environmental Sciences scientists by D-index, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
D-Index Scientists This scientist
30 12
31 26
32 51
33 88
34 123
35 163
36 206
37 267
38 265
39 275
40 321
41 343
42 305
43 336
44 330
45 348
46 291
47 275
48 272
49 273
50 263
51 232
52 266
53 217
54 198
55 177
56 202
57 204
58 166
59 177
60 166
61 152
62 143
63 150
64 124
65 119
66 120
67 118
68 82
69 98
70 94
71 105
72 74
73 84
74 70
75 67 75
76 78
77 60
78 59
79 52
80 47
81 38
82 48
83 42
84 42
85 43
86 29
87 37
88 29
89 30
90 34
91 20
92 22
93 17
94 19
95 24
96 21
97 20
98 24
99 17
100 17
101 21
102 25
103 18
104 26
105 20
106 15
107 10
108 13
109 15
110 12
111 8
112 7
113 9
114 6
115 12
116 7
117 8
118 3
119 5
120 7
121 2
122 4
123 8
124 7
125 9
126+ 92
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Nadhir Al-Ansari D-index placement in Environmental Sciences in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 9,676 Environmental Sciences scientists ranked by Research.com in 2026, grouped into 97 ranges running from 30 to 126+ D-Index.
  • Nadhir Al-Ansari, a Environmental Sciences scholar from Luleå University of Technology, records 75 D-Index - the 87th percentile of the discipline.
  • 87% of ranked Environmental Sciences scientists score the same or lower than Nadhir Al-Ansari, and about 13% score higher.
  • The median of the discipline falls in the 51 D-Index range, and Nadhir Al-Ansari ranks above the median.
  • The most crowded range is 45 D-Index, holding 348 scientists (4% of the field).
  • 59% of the field sits in the lowest quarter of the value range (up to 54 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 126 D-Index or more, 92 scientists in all (<1% of the field).

Overview

Nadhir Al-Ansari is affiliated with Luleå University of Technology in Sweden. The scientist's research spans environmental science and engineering, with notable contributions in subfields such as global and planetary change, environmental engineering, water science and technology, civil and structural engineering, and artificial intelligence.

The main research topics covered include hydrology and watershed management studies, hydrological forecasting using AI, flood risk assessment and management, groundwater and watershed analysis, hydrology and drought analysis, climate variability and models, and groundwater and isotope geochemistry.

Recent publications by Nadhir Al-Ansari include the following papers:

  • Influence of Data Splitting on Performance of Machine Learning Models in Prediction of Shear Strength of Soil (2021, Mathematical Problems in Engineering)
  • A review on emerging water contaminants and the application of sustainable removal technologies (2022, Case Studies in Chemical and Environmental Engineering)
  • Flood Detection and Susceptibility Mapping Using Sentinel-1 Remote Sensing Data and a Machine Learning Approach: Hybrid Intelligence of Bagging Ensemble Based on K-Nearest Neighbor Classifier (2020, Remote Sensing)
  • Groundwater level prediction using machine learning models: A comprehensive review (2022, Neurocomputing)
  • Performance Evaluation of Machine Learning Methods for Forest Fire Modeling and Prediction (2020, Symmetry)

Nadhir Al-Ansari has frequently published in the following academic journals and venues:

  • Scientific Reports
  • Engineering
  • Applied Water Science
  • Sustainability
  • Water

Collaboration is a significant part of their work, with frequent co-authors including Jan Laue, Zaher Mundher Yaseen, Varoujan K. Sissakian, Ahmed Elbeltagi, and Mohamed A. Mattar.

Best Publications

  • Influence of Data Splitting on Performance of Machine Learning Models in Prediction of Shear Strength of Soil

    Quang Hung Nguyen;Hai-Bang Ly;Lanh Si Ho;Nadhir Al-Ansari

  • Groundwater level prediction using machine learning models: A comprehensive review

    Unknown

  • Flood Detection and Susceptibility Mapping Using Sentinel-1 Remote Sensing Data and a Machine Learning Approach: Hybrid Intelligence of Bagging Ensemble Based on K-Nearest Neighbor Classifier

    Himan Shahabi;Ataollah Shirzadi;Kayvan Ghaderi;Ebrahim Omidvar

  • Management of Water Resources in Iraq: Perspectives and Prognoses

    Nadhir A. Al-Ansari

  • Shallow Landslide Susceptibility Mapping: A Comparison between Logistic Model Tree, Logistic Regression, Naïve Bayes Tree, Artificial Neural Network, and Support Vector Machine Algorithms

    Viet-Ha Nhu;Ataollah Shirzadi;Himan Shahabi;Sushant K. Singh

  • Irrigation Induced Salinity and Sodicity Hazards on Soil and Groundwater: An Overview of Its Causes, Impacts and Mitigation Strategies

    Aadhityaa Mohanavelu;Sujay Raghavendra Naganna;Nadhir Al-Ansari

  • Performance Evaluation of Machine Learning Methods for Forest Fire Modeling and Prediction

    Binh Thai Pham;Abolfazl Jaafari;Mohammadtaghi Avand;Nadhir Al-Ansari

  • Experimental and Numerical Analysis for Earth-Fill Dam Seepage

    Ahmed Mohammed Sami Al-Janabi;Abdul Halim Ghazali;Yousry Mahmoud Ghazaw;Haitham Abdulmohsin Afan

  • Sand and dust storm events in Iraq

    Varoujan K. Sissakian;Nadhir Al-Ansari;Sven Knutsson

  • Crop Water Requirements and Irrigation Schedules for Some Major Crops in Southern Iraq

    Salam Hussein Ewaid;Salwan Ali Abed;Nadhir Al-Ansari

  • Waste foundry sand/MgFe-layered double hydroxides composite material for efficient removal of Congo red dye from aqueous solution.

    Dooraid N. Ahmed;Laith A. Naji;Ayad A. H. Faisal;Nadhir Al-Ansari

  • GIS Based Hybrid Computational Approaches for Flash Flood Susceptibility Assessment

    Binh Thai Pham;Mohammadtaghi Avand;Saeid Janizadeh;Tran Van Phong

  • Impact of COVID-19 lockdown on NO2, O3, PM2.5 and PM10 concentrations and assessing air quality changes in Baghdad, Iraq

    Bassim Mohammed Hashim;Saadi K. Al-Naseri;Ali Al-Maliki;Nadhir Al-Ansari

  • Estimation of SPEI Meteorological Drought Using Machine Learning Algorithms

    Ali Mokhtar;Mohammadnabi Jalali;Hongming He;Nadhir Al-Ansari

  • Development and Evaluation of a Water Quality Index for the Iraqi Rivers

    Salam Hussein Ewaid;Salwan Ali Abed;Nadhir Al-Ansari;Riyadh M. Salih

  • Toward Prudent management of Water Resources in Iraq

    Nadhir Abbas Al-Ansari;Sven Knutsson

  • Seasonal Drought Pattern Changes Due to Climate Variability: Case Study in Afghanistan

    Ishanch Qutbudin;Mohammed Sanusi Shiru;Ahmad Sharafati;Kamal Ahmed

  • Soft Computing Ensemble Models Based on Logistic Regression for Groundwater Potential Mapping

    Phong Tung Nguyen;Duong Hai Ha;Mohammadtaghi Avand;Abolfazl Jaafari

  • Precipitation projection using a CMIP5 GCM ensemble model: a regional investigation of Syria

    Rajab Homsi;Mohammed Sanusi Shiru;Shamsuddin Shahid;Tarmizi Ismail

  • Deep Learning Data-Intelligence Model Based on Adjusted Forecasting Window Scale: Application in Daily Streamflow Simulation

    Minglei Fu;Tingchao Fan;Zi'ang Ding;Sinan Q. Salih

  • Water Footprint of Wheat in Iraq

    Salam Hussein Ewaid;Salwan Ali Abed;Nadhir Al-Ansari

  • Present Conditions and Future Challenges of Water Resources Problems in Iraq

    Nadhir Al-Ansari;Ammar A. Ali;Sven Knutsson

  • Water quality assessment along Tigris River (Iraq) using water quality index (WQI) and GIS software

    Ali Chabuk;Qais Al-Madhlom;Qais Al-Madhlom;Ali Al-Maliki;Nadhir Al-Ansari

Frequent Co-Authors

Zaher Mundher Yaseen
Zaher Mundher Yaseen King Fahd University of Petroleum and Minerals
Shamsuddin Shahid
Shamsuddin Shahid University of Technology Malaysia
Indra Prakash
Indra Prakash Geological Survey of India
Himan Shahabi
Himan Shahabi University of Kurdistan
Ataollah Shirzadi
Ataollah Shirzadi University of Kurdistan
Kwok-wing Chau
Kwok-wing Chau Hong Kong Polytechnic University
Baharin Bin Ahmad
Baharin Bin Ahmad University of Technology Malaysia
Ahmed El-Shafie
Ahmed El-Shafie United Arab Emirates University
Mumtaz Ali
Mumtaz Ali University of Southern Queensland
Marten Geertsema
Marten Geertsema University of Northern British Columbia

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