find_droughts: Identifying Low Flow Periods

Description Usage Arguments Value See Also Examples

View source: R/pooling.R

Description

A streamflow deficit is defined as an event where discharges are below a given threshold.

Usage

1
find_droughts(x, threshold = vary_threshold, varying = "constant", ...)

Arguments

x

an object which can be coerced to class xts. Either with a single column or with a column named 'discharge'. Units of x are retrieved from the attributes. If it fails, an error is raised.

threshold

The threshold can either be a constant value, a time series with the same length as x or a function (taking a single argument) returning either of these. Furthermore threshold can be a character vector of length one specifying a quantile of x like threshold = 'Q80' as a shortcut of threshold = function(x) quantile(x, 0.2, na.rm = TRUE). See vary_threshold for varying a threshold in time.

varying

if varying is a character vector of length one, values of "constant", "daily", "weekly" and "monthly" are allowed. If a vector of class POSIX is provided, a seasonal varying threshold is computed, where the times provided define the start of the season. Only the day of the year is taken, the year itself doesn't have a meaning.

...

if threshold is a function, these additional arguments are passed on to the function

Value

an object of class 'deficit', which is basically an xts object with the columns

discharge

discharges as provided with x

threshold

the threshold

def.increase

The increase of the deficit volume in m^3 per day.

event.no

an event id. If an event is numbered "0" this period not considered as a streamflow deficit.

See Also

There are summary and plot methods, see summary.deficit and plot.deficit.

pooling, summary.deficit, plot.deficit

Examples

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data(ray)
ray <- as.xts(ray)["1970::1979", ]
r <- find_droughts(ray)
head(r)
summary(r)


plot(r)


# threshold is to low, because there are many days with
# zero flow observations
# provide threshold as a constant value
r <- find_droughts(ray, threshold = 0.02)
head(r)
summary(r)

plot(r)



# provide threshold as a function
r <- find_droughts(ray,
                   threshold = function(x) quantile(x, 0.2, na.rm = TRUE))
head(r)
summary(r)

Example output

Loading required package: xts
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: lmom
Loading required package: lattice
streamflow defict
data.frame with 6 observations and 1 events

           discharge threshold def.increase event.no
1970-01-01     0.010         0         -864        0
1970-01-02     0.010         0         -864        0
1970-01-03     0.010         0         -864        0
1970-01-04     0.005         0         -432        0
1970-01-05     0.005         0         -432        0
1970-01-06     0.005         0         -432        0
Summary of droughts
River: Ray at Grendon Underwood
Units: volumes in m<U+00B3>, duration in days

Filtered 46 minor events of 112 total. 
Only droughts with volume >= 0 m<U+00B3> and duration >= 5 days are reported.

    event.no      start       time        end volume duration dbt qmin
2          2 1970-05-21 1970-06-10 1970-06-10      0       21  21    0
3          3 1970-06-13 1970-06-26 1970-06-26      0       14  14    0
4          4 1970-06-28 1970-07-13 1970-07-13      0       16  16    0
7          7 1970-07-25 1970-08-05 1970-08-05      0       12  12    0
8          8 1970-08-08 1970-08-18 1970-08-18      0       11  11    0
9          9 1970-08-24 1970-09-08 1970-09-08      0       16  16    0
11        11 1970-09-15 1970-10-31 1970-10-31      0       47  47    0
14        14 1971-05-17 1971-05-22 1971-05-22      0        6   6    0
17        17 1971-05-29 1971-06-07 1971-06-07      0       10  10    0
19        19 1971-07-07 1971-07-23 1971-07-23      0       17  17    0
21        21 1971-09-01 1971-09-23 1971-09-23      0       23  23    0
23        23 1971-09-28 1971-10-02 1971-10-02      0        5   5    0
24        24 1971-10-04 1971-10-11 1971-10-11      0        8   8    0
25        25 1972-01-04 1972-01-12 1972-01-12      0        9   9    0
27        27 1972-06-14 1972-06-26 1972-06-26      0       13  13    0
30        30 1972-07-10 1972-07-21 1972-07-21      0       12  12    0
31        31 1972-07-26 1972-07-30 1972-07-30      0        5   5    0
32        32 1972-08-11 1972-09-07 1972-09-07      0       28  28    0
33        33 1972-09-11 1972-10-09 1972-10-09      0       29  29    0
34        34 1972-10-12 1972-11-06 1972-11-06      0       26  26    0
39        39 1973-05-31 1973-06-18 1973-06-18      0       19  19    0
41        41 1973-07-01 1973-07-05 1973-07-05      0        5   5    0
43        43 1973-07-22 1973-08-04 1973-08-04      0       14  14    0
44        44 1973-08-08 1973-12-07 1973-12-07      0      122 122    0
45        45 1973-12-09 1973-12-20 1973-12-20      0       12  12    0
46        46 1974-04-14 1974-04-27 1974-04-27      0       14  14    0
48        48 1974-05-04 1974-05-10 1974-05-10      0        7   7    0
49        49 1974-05-15 1974-06-07 1974-06-07      0       24  24    0
50        50 1974-06-09 1974-06-15 1974-06-15      0        7   7    0
51        51 1974-06-20 1974-06-25 1974-06-25      0        6   6    0
52        52 1974-07-06 1974-07-13 1974-07-13      0        8   8    0
54        54 1974-07-21 1974-08-03 1974-08-03      0       14  14    0
57        57 1974-08-16 1974-08-25 1974-08-25      0       10  10    0
61        61 1975-06-04 1975-06-15 1975-06-15      0       12  12    0
62        62 1975-06-17 1975-07-16 1975-07-16      0       30  30    0
63        63 1975-07-21 1975-09-12 1975-09-12      0       54  54    0
64        64 1975-09-16 1975-09-24 1975-09-24      0        9   9    0
65        65 1975-09-29 1975-11-02 1975-11-02      0       35  35    0
66        66 1975-11-04 1975-11-14 1975-11-14      0       11  11    0
68        68 1975-11-20 1975-11-26 1975-11-26      0        7   7    0
69        69 1975-12-07 1975-12-30 1975-12-30      0       24  24    0
71        71 1976-01-21 1976-02-11 1976-02-11      0       22  22    0
72        72 1976-02-26 1976-03-14 1976-03-14      0       18  18    0
73        73 1976-03-21 1976-03-31 1976-03-31      0       11  11    0
74        74 1976-04-02 1976-04-13 1976-04-13      0       12  12    0
75        75 1976-04-15 1976-09-24 1976-09-24      0      163 163    0
80        80 1976-11-23 1976-11-27 1976-11-27      0        5   5    0
81        81 1977-04-15 1977-04-25 1977-04-25      0       11  11    0
82        82 1977-05-19 1977-06-09 1977-06-09      0       22  22    0
83        83 1977-06-23 1977-06-27 1977-06-27      0        5   5    0
84        84 1977-07-03 1977-08-15 1977-08-15      0       44  44    0
86        86 1977-09-06 1977-09-24 1977-09-24      0       19  19    0
87        87 1977-09-26 1977-10-07 1977-10-07      0       12  12    0
88        88 1977-10-10 1977-10-31 1977-10-31      0       22  22    0
91        91 1977-11-26 1977-12-05 1977-12-05      0       10  10    0
92        92 1978-05-20 1978-06-28 1978-06-28      0       40  40    0
93        93 1978-06-30 1978-07-30 1978-07-30      0       31  31    0
94        94 1978-08-05 1978-09-27 1978-09-27      0       54  54    0
95        95 1978-09-29 1978-11-18 1978-11-18      0       51  51    0
96        96 1978-11-20 1978-12-06 1978-12-06      0       17  17    0
101      101 1979-06-26 1979-08-07 1979-08-07      0       43  43    0
104      104 1979-08-17 1979-08-22 1979-08-22      0        6   6    0
105      105 1979-08-24 1979-10-07 1979-10-07      0       45  45    0
107      107 1979-10-11 1979-10-24 1979-10-24      0       14  14    0
109      109 1979-11-10 1979-11-17 1979-11-17      0        8   8    0
110      110 1979-11-19 1979-11-25 1979-11-25      0        7   7    0
         tqmin
2   1970-05-21
3   1970-06-13
4   1970-06-28
7   1970-07-25
8   1970-08-08
9   1970-08-24
11  1970-09-15
14  1971-05-17
17  1971-05-29
19  1971-07-07
21  1971-09-01
23  1971-09-28
24  1971-10-04
25  1972-01-04
27  1972-06-14
30  1972-07-10
31  1972-07-26
32  1972-08-11
33  1972-09-11
34  1972-10-12
39  1973-05-31
41  1973-07-01
43  1973-07-22
44  1973-08-08
45  1973-12-09
46  1974-04-14
48  1974-05-04
49  1974-05-15
50  1974-06-09
51  1974-06-20
52  1974-07-06
54  1974-07-21
57  1974-08-16
61  1975-06-04
62  1975-06-17
63  1975-07-21
64  1975-09-16
65  1975-09-29
66  1975-11-04
68  1975-11-20
69  1975-12-07
71  1976-01-21
72  1976-02-26
73  1976-03-21
74  1976-04-02
75  1976-04-15
80  1976-11-23
81  1977-04-15
82  1977-05-19
83  1977-06-23
84  1977-07-03
86  1977-09-06
87  1977-09-26
88  1977-10-10
91  1977-11-26
92  1978-05-20
93  1978-06-30
94  1978-08-05
95  1978-09-29
96  1978-11-20
101 1979-06-26
104 1979-08-17
105 1979-08-24
107 1979-10-11
109 1979-11-10
110 1979-11-19
streamflow defict
data.frame with 6 observations and 1 events

           discharge threshold def.increase event.no
1970-01-01     0.010      0.02          864        1
1970-01-02     0.010      0.02          864        1
1970-01-03     0.010      0.02          864        1
1970-01-04     0.005      0.02         1296        1
1970-01-05     0.005      0.02         1296        1
1970-01-06     0.005      0.02         1296        1
Summary of droughts
River: Ray at Grendon Underwood
Units: volumes in m<U+00B3>, duration in days

Filtered 30 minor events of 92 total. 
Only droughts with volume >= 1893.024 m<U+00B3> and duration >= 5 days are reported.

   event.no      start       time        end   volume duration dbt  qmin
1         1 1970-01-01 1970-01-08 1970-01-08   9763.2        8   8 0.000
3         3 1970-05-04 1970-05-09 1970-05-09   4147.2        6   6 0.010
4         4 1970-05-13 1970-08-19 1970-08-19 162864.0       99  99 0.000
5         5 1970-08-21 1970-11-06 1970-11-06 128563.2       78  78 0.000
6         6 1970-11-08 1970-11-13 1970-11-13   5702.4        6   6 0.005
7         7 1970-12-19 1970-12-28 1970-12-28   7171.2       10  10 0.009
8         8 1971-04-01 1971-04-22 1971-04-22  25056.0       22  22 0.000
9         9 1971-05-01 1971-06-09 1971-06-09  60048.0       40  40 0.000
12       12 1971-06-23 1971-08-02 1971-08-02  59875.2       41  41 0.000
13       13 1971-08-04 1971-08-10 1971-08-10   5961.6        7   7 0.005
16       16 1971-08-22 1971-10-12 1971-10-12  82684.8       52  52 0.000
18       18 1971-10-24 1971-11-04 1971-11-04  13046.4       12  12 0.005
19       19 1971-11-13 1971-11-17 1971-11-17   3196.8        5   5 0.010
20       20 1971-12-13 1971-12-18 1971-12-18   3628.8        6   6 0.010
21       21 1972-01-04 1972-01-12 1972-01-12  15552.0        9   9 0.000
23       23 1972-04-20 1972-04-28 1972-04-28   7862.4        9   9 0.005
25       25 1972-05-04 1972-05-08 1972-05-08   2851.2        5   5 0.010
26       26 1972-05-17 1972-07-30 1972-07-30 112838.4       75  75 0.000
28       28 1972-08-08 1972-11-11 1972-11-11 160272.0       96  96 0.000
29       29 1972-11-14 1972-11-18 1972-11-18   7084.8        5   5 0.001
30       30 1972-11-22 1972-11-30 1972-11-30   9676.8        9   9 0.005
31       31 1972-12-28 1973-01-14 1973-01-14  15292.8       18  18 0.005
34       34 1973-03-11 1973-04-01 1973-04-01  23846.4       22  22 0.000
36       36 1973-04-05 1973-04-23 1973-04-23  22723.2       19  19 0.000
37       37 1973-04-25 1973-05-03 1973-05-03   7257.6        9   9 0.005
38       38 1973-05-12 1973-06-19 1973-06-19  57801.6       39  39 0.000
39       39 1973-06-21 1973-06-25 1973-06-25   8208.0        5   5 0.000
40       40 1973-06-30 1973-07-05 1973-07-05   8640.0        6   6 0.000
41       41 1973-07-09 1973-07-14 1973-07-14   9676.8        6   6 0.000
42       42 1973-07-21 1973-08-05 1973-08-05  26956.8       16  16 0.000
43       43 1973-08-07 1973-12-20 1973-12-20 232848.0      136 136 0.000
44       44 1974-03-29 1974-06-15 1974-06-15 122601.6       79  79 0.000
45       45 1974-06-18 1974-06-25 1974-06-25  12182.4        8   8 0.000
46       46 1974-06-30 1974-07-15 1974-07-15  23414.4       16  16 0.000
47       47 1974-07-17 1974-08-03 1974-08-03  29808.0       18  18 0.000
48       48 1974-08-06 1974-08-25 1974-08-25  32140.8       20  20 0.000
49       49 1974-08-27 1974-09-01 1974-09-01   8467.2        6   6 0.000
50       50 1974-09-10 1974-09-22 1974-09-22  15811.2       13  13 0.000
55       55 1975-04-25 1975-05-16 1975-05-16  22809.6       22  22 0.005
56       56 1975-05-21 1975-07-16 1975-07-16  92188.8       57  57 0.000
57       57 1975-07-19 1975-12-01 1975-12-01 225331.2      136 136 0.000
58       58 1975-12-03 1976-01-03 1976-01-03  51321.6       32  32 0.000
59       59 1976-01-06 1976-02-11 1976-02-11  57369.6       37  37 0.000
60       60 1976-02-15 1976-09-26 1976-09-26 378604.8      225 225 0.000
61       61 1976-09-28 1976-10-02 1976-10-02   5616.0        5   5 0.000
65       65 1976-10-16 1976-10-28 1976-10-28  12787.2       13  13 0.000
67       67 1976-11-22 1976-11-27 1976-11-27   8985.6        6   6 0.000
68       68 1977-04-14 1977-04-25 1977-04-25  20217.6       12  12 0.000
69       69 1977-05-18 1977-06-09 1977-06-09  39139.2       23  23 0.000
71       71 1977-06-22 1977-06-27 1977-06-27   9676.8        6   6 0.000
72       72 1977-07-02 1977-08-16 1977-08-16  79228.8       46  46 0.000
75       75 1977-09-05 1977-11-01 1977-11-01  97545.6       58  58 0.000
77       77 1977-11-16 1977-11-23 1977-11-23  12009.6        8   8 0.000
78       78 1977-11-25 1977-12-06 1977-12-06  19008.0       12  12 0.000
80       80 1978-05-20 1978-07-30 1978-07-30 124243.2       72  72 0.000
81       81 1978-08-04 1978-12-07 1978-12-07 216345.6      126 126 0.000
83       83 1978-12-18 1978-12-22 1978-12-22   5961.6        5   5 0.000
84       84 1979-01-02 1979-01-06 1979-01-06   6739.2        5   5 0.000
87       87 1979-06-20 1979-08-07 1979-08-07  81475.2       49  49 0.000
88       88 1979-08-09 1979-10-25 1979-10-25 129600.0       78  78 0.000
89       89 1979-10-27 1979-10-31 1979-10-31   8208.0        5   5 0.000
90       90 1979-11-09 1979-11-26 1979-11-26  27648.0       18  18 0.000
        tqmin
1  1970-01-07
3  1970-05-06
4  1970-05-21
5  1970-08-24
6  1970-11-10
7  1970-12-27
8  1971-04-21
9  1971-05-11
12 1971-07-02
13 1971-08-08
16 1971-09-01
18 1971-10-28
19 1971-11-15
20 1971-12-16
21 1972-01-04
23 1972-04-25
25 1972-05-07
26 1972-06-07
28 1972-08-11
29 1972-11-17
30 1972-11-25
31 1973-01-12
34 1973-03-29
36 1973-04-17
37 1973-04-28
38 1973-05-27
39 1973-06-22
40 1973-07-01
41 1973-07-10
42 1973-07-22
43 1973-08-08
44 1974-04-14
45 1974-06-20
46 1974-07-06
47 1974-07-19
48 1974-08-07
49 1974-08-29
50 1974-09-19
55 1975-05-01
56 1975-05-31
57 1975-07-21
58 1975-12-07
59 1976-01-16
60 1976-02-26
61 1976-10-01
65 1976-10-17
67 1976-11-23
68 1977-04-15
69 1977-05-19
71 1977-06-23
72 1977-07-03
75 1977-09-06
77 1977-11-17
78 1977-11-26
80 1978-05-20
81 1978-08-05
83 1978-12-19
84 1979-01-04
87 1979-06-22
88 1979-08-10
89 1979-10-28
90 1979-11-10
streamflow defict
data.frame with 6 observations and 1 events

           discharge threshold def.increase event.no
1970-01-01     0.010         0         -864        0
1970-01-02     0.010         0         -864        0
1970-01-03     0.010         0         -864        0
1970-01-04     0.005         0         -432        0
1970-01-05     0.005         0         -432        0
1970-01-06     0.005         0         -432        0
Summary of droughts
River: Ray at Grendon Underwood
Units: volumes in m<U+00B3>, duration in days

Filtered 46 minor events of 112 total. 
Only droughts with volume >= 0 m<U+00B3> and duration >= 5 days are reported.

    event.no      start       time        end volume duration dbt qmin
2          2 1970-05-21 1970-06-10 1970-06-10      0       21  21    0
3          3 1970-06-13 1970-06-26 1970-06-26      0       14  14    0
4          4 1970-06-28 1970-07-13 1970-07-13      0       16  16    0
7          7 1970-07-25 1970-08-05 1970-08-05      0       12  12    0
8          8 1970-08-08 1970-08-18 1970-08-18      0       11  11    0
9          9 1970-08-24 1970-09-08 1970-09-08      0       16  16    0
11        11 1970-09-15 1970-10-31 1970-10-31      0       47  47    0
14        14 1971-05-17 1971-05-22 1971-05-22      0        6   6    0
17        17 1971-05-29 1971-06-07 1971-06-07      0       10  10    0
19        19 1971-07-07 1971-07-23 1971-07-23      0       17  17    0
21        21 1971-09-01 1971-09-23 1971-09-23      0       23  23    0
23        23 1971-09-28 1971-10-02 1971-10-02      0        5   5    0
24        24 1971-10-04 1971-10-11 1971-10-11      0        8   8    0
25        25 1972-01-04 1972-01-12 1972-01-12      0        9   9    0
27        27 1972-06-14 1972-06-26 1972-06-26      0       13  13    0
30        30 1972-07-10 1972-07-21 1972-07-21      0       12  12    0
31        31 1972-07-26 1972-07-30 1972-07-30      0        5   5    0
32        32 1972-08-11 1972-09-07 1972-09-07      0       28  28    0
33        33 1972-09-11 1972-10-09 1972-10-09      0       29  29    0
34        34 1972-10-12 1972-11-06 1972-11-06      0       26  26    0
39        39 1973-05-31 1973-06-18 1973-06-18      0       19  19    0
41        41 1973-07-01 1973-07-05 1973-07-05      0        5   5    0
43        43 1973-07-22 1973-08-04 1973-08-04      0       14  14    0
44        44 1973-08-08 1973-12-07 1973-12-07      0      122 122    0
45        45 1973-12-09 1973-12-20 1973-12-20      0       12  12    0
46        46 1974-04-14 1974-04-27 1974-04-27      0       14  14    0
48        48 1974-05-04 1974-05-10 1974-05-10      0        7   7    0
49        49 1974-05-15 1974-06-07 1974-06-07      0       24  24    0
50        50 1974-06-09 1974-06-15 1974-06-15      0        7   7    0
51        51 1974-06-20 1974-06-25 1974-06-25      0        6   6    0
52        52 1974-07-06 1974-07-13 1974-07-13      0        8   8    0
54        54 1974-07-21 1974-08-03 1974-08-03      0       14  14    0
57        57 1974-08-16 1974-08-25 1974-08-25      0       10  10    0
61        61 1975-06-04 1975-06-15 1975-06-15      0       12  12    0
62        62 1975-06-17 1975-07-16 1975-07-16      0       30  30    0
63        63 1975-07-21 1975-09-12 1975-09-12      0       54  54    0
64        64 1975-09-16 1975-09-24 1975-09-24      0        9   9    0
65        65 1975-09-29 1975-11-02 1975-11-02      0       35  35    0
66        66 1975-11-04 1975-11-14 1975-11-14      0       11  11    0
68        68 1975-11-20 1975-11-26 1975-11-26      0        7   7    0
69        69 1975-12-07 1975-12-30 1975-12-30      0       24  24    0
71        71 1976-01-21 1976-02-11 1976-02-11      0       22  22    0
72        72 1976-02-26 1976-03-14 1976-03-14      0       18  18    0
73        73 1976-03-21 1976-03-31 1976-03-31      0       11  11    0
74        74 1976-04-02 1976-04-13 1976-04-13      0       12  12    0
75        75 1976-04-15 1976-09-24 1976-09-24      0      163 163    0
80        80 1976-11-23 1976-11-27 1976-11-27      0        5   5    0
81        81 1977-04-15 1977-04-25 1977-04-25      0       11  11    0
82        82 1977-05-19 1977-06-09 1977-06-09      0       22  22    0
83        83 1977-06-23 1977-06-27 1977-06-27      0        5   5    0
84        84 1977-07-03 1977-08-15 1977-08-15      0       44  44    0
86        86 1977-09-06 1977-09-24 1977-09-24      0       19  19    0
87        87 1977-09-26 1977-10-07 1977-10-07      0       12  12    0
88        88 1977-10-10 1977-10-31 1977-10-31      0       22  22    0
91        91 1977-11-26 1977-12-05 1977-12-05      0       10  10    0
92        92 1978-05-20 1978-06-28 1978-06-28      0       40  40    0
93        93 1978-06-30 1978-07-30 1978-07-30      0       31  31    0
94        94 1978-08-05 1978-09-27 1978-09-27      0       54  54    0
95        95 1978-09-29 1978-11-18 1978-11-18      0       51  51    0
96        96 1978-11-20 1978-12-06 1978-12-06      0       17  17    0
101      101 1979-06-26 1979-08-07 1979-08-07      0       43  43    0
104      104 1979-08-17 1979-08-22 1979-08-22      0        6   6    0
105      105 1979-08-24 1979-10-07 1979-10-07      0       45  45    0
107      107 1979-10-11 1979-10-24 1979-10-24      0       14  14    0
109      109 1979-11-10 1979-11-17 1979-11-17      0        8   8    0
110      110 1979-11-19 1979-11-25 1979-11-25      0        7   7    0
         tqmin
2   1970-05-21
3   1970-06-13
4   1970-06-28
7   1970-07-25
8   1970-08-08
9   1970-08-24
11  1970-09-15
14  1971-05-17
17  1971-05-29
19  1971-07-07
21  1971-09-01
23  1971-09-28
24  1971-10-04
25  1972-01-04
27  1972-06-14
30  1972-07-10
31  1972-07-26
32  1972-08-11
33  1972-09-11
34  1972-10-12
39  1973-05-31
41  1973-07-01
43  1973-07-22
44  1973-08-08
45  1973-12-09
46  1974-04-14
48  1974-05-04
49  1974-05-15
50  1974-06-09
51  1974-06-20
52  1974-07-06
54  1974-07-21
57  1974-08-16
61  1975-06-04
62  1975-06-17
63  1975-07-21
64  1975-09-16
65  1975-09-29
66  1975-11-04
68  1975-11-20
69  1975-12-07
71  1976-01-21
72  1976-02-26
73  1976-03-21
74  1976-04-02
75  1976-04-15
80  1976-11-23
81  1977-04-15
82  1977-05-19
83  1977-06-23
84  1977-07-03
86  1977-09-06
87  1977-09-26
88  1977-10-10
91  1977-11-26
92  1978-05-20
93  1978-06-30
94  1978-08-05
95  1978-09-29
96  1978-11-20
101 1979-06-26
104 1979-08-17
105 1979-08-24
107 1979-10-11
109 1979-11-10
110 1979-11-19

lfstat documentation built on May 30, 2017, 1:46 a.m.